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fix libp2p + other prs that were wrongly overwritten before (111,112,117,118,1119 + misc commits from Alex)

0e32599e71628175d207d1e3257a72b98e84cad2 · 2025-07-31 20:36:47 +0100 · Gelu Vrabie

Co-authored-by: Gelu Vrabie <gelu@exolabs.net>
Co-authored-by: Alex Cheema <41707476+AlexCheema@users.noreply.github.com>
Co-authored-by: Seth Howes <71157822+sethhowes@users.noreply.github.com>
Co-authored-by: Matt Beton <matthew.beton@gmail.com>
Co-authored-by: Alex Cheema <alexcheema123@gmail.com>

Files touched

Diff

commit 0e32599e71628175d207d1e3257a72b98e84cad2
Author: Gelu Vrabie <gelu.vrabie.univ@gmail.com>
Date:   Thu Jul 31 20:36:47 2025 +0100

    fix libp2p + other prs that were wrongly overwritten before (111,112,117,118,1119 + misc commits from Alex)
    
    Co-authored-by: Gelu Vrabie <gelu@exolabs.net>
    Co-authored-by: Alex Cheema <41707476+AlexCheema@users.noreply.github.com>
    Co-authored-by: Seth Howes <71157822+sethhowes@users.noreply.github.com>
    Co-authored-by: Matt Beton <matthew.beton@gmail.com>
    Co-authored-by: Alex Cheema <alexcheema123@gmail.com>
---
 .github/actions/format/action.yml                  |   2 +-
 .github/actions/lint-check/action.yml              |   2 +-
 .github/actions/lint/action.yml                    |   2 +-
 .github/actions/regenerate-protobufs/action.yml    |   2 +-
 .github/actions/typecheck/action.yml               |   6 +-
 .github/actions/unit-test/action.yml               |  12 +
 .github/workflows/e2e_test.yml                     | 360 ++++++++
 .github/workflows/pipeline.yml                     | 111 ++-
 engines/mlx/utils_mlx.py                           |   4 +
 justfile                                           |   3 +
 master/discovery_supervisor.py                     |   7 +-
 master/forwarder_supervisor.py                     |   1 +
 master/main.py                                     |  21 +-
 master/tests/test_topology.py                      |  17 +-
 networking/forwarder/go.mod                        |  98 +--
 networking/forwarder/go.sum                        | 253 +++---
 networking/forwarder/main.go                       |   7 +
 networking/forwarder/src/event_writer.go           | 259 ++++++
 networking/forwarder/src/libp2p.go                 | 443 +++++++++-
 pyproject.toml                                     |   6 +-
 run.sh                                             |   4 +-
 rust/discovery/src/behaviour.rs                    |   2 +-
 rust/discovery/src/lib.rs                          |  18 +-
 rust/discovery/src/transport.rs                    |   3 +-
 rust/exo_pyo3_bindings/src/discovery.rs            | 124 +++
 shared/apply/apply.py                              |  33 +-
 shared/db/sqlite/connector.py                      | 138 +++-
 shared/db/sqlite/event_log_manager.py              |  68 +-
 shared/topology.py                                 |  35 +-
 shared/types/events/_events.py                     |  19 +
 shared/types/worker/common.py                      |   1 -
 shared/types/worker/ops.py                         |   9 -
 shared/types/worker/runners.py                     |  22 +-
 worker/common.py                                   |  35 +
 worker/download/conftest.py                        |   4 +-
 worker/main.py                                     | 648 +--------------
 worker/plan.py                                     | 205 +++++
 worker/runner/communication.py                     |   2 +-
 worker/tests/conftest.py                           | 201 ++---
 worker/tests/constants.py                          |  26 +
 worker/tests/test_download.py                      |   1 +
 worker/tests/test_handlers/conftest.py             |  70 ++
 worker/tests/test_handlers/test_handlers_happy.py  | 159 ++++
 worker/tests/test_handlers/test_handlers_sad.py    |  61 ++
 worker/tests/test_handlers/utils.py                |  18 +
 worker/tests/test_integration/conftest.py          |  36 +
 .../integration_utils.py}                          |   0
 .../test_creation.py}                              | 306 +------
 worker/tests/test_integration/test_inference.py    | 256 ++++++
 .../test_supervisor_errors.py                      | 126 ++-
 worker/tests/test_plan/test_worker_plan.py         | 540 ++++++++++++
 worker/tests/test_plan/test_worker_plan_utils.py   | 272 ++++++
 worker/tests/test_runner_connection.py             |  73 +-
 worker/tests/test_serdes.py                        |   2 -
 worker/tests/test_spinup_timeout.py                |   8 +-
 .../tests/{ => test_supervisor}/test_supervisor.py |   6 -
 worker/tests/test_worker_handlers.py               | 237 ------
 worker/tests/test_worker_plan.py                   | 913 ---------------------
 worker/tests/test_worker_plan_utils.py             | 195 -----
 worker/worker.py                                   | 415 ++++++++++
 60 files changed, 4049 insertions(+), 2858 deletions(-)

diff --git a/.github/actions/format/action.yml b/.github/actions/format/action.yml
index 1b43e9c4..5df1b5f4 100644
--- a/.github/actions/format/action.yml
+++ b/.github/actions/format/action.yml
@@ -6,5 +6,5 @@ runs:
   using: "composite"
   steps:
     - name: Format code
-      run: nix develop -c just fmt
+      run: nix --extra-experimental-features nix-command --extra-experimental-features flakes develop -c just fmt
       shell: bash
diff --git a/.github/actions/lint-check/action.yml b/.github/actions/lint-check/action.yml
index f666cae9..7d69c90d 100644
--- a/.github/actions/lint-check/action.yml
+++ b/.github/actions/lint-check/action.yml
@@ -6,5 +6,5 @@ runs:
   using: "composite"
   steps:
     - name: Lint check
-      run: nix develop -c just lint-check
+      run: nix --extra-experimental-features nix-command --extra-experimental-features flakes develop -c just lint-check
       shell: bash
diff --git a/.github/actions/lint/action.yml b/.github/actions/lint/action.yml
index 68c7eb53..05f7939c 100644
--- a/.github/actions/lint/action.yml
+++ b/.github/actions/lint/action.yml
@@ -6,5 +6,5 @@ runs:
   using: "composite"
   steps:
     - name: Lint code
-      run: nix develop -c just lint
+      run: nix --extra-experimental-features nix-command --extra-experimental-features flakes develop -c just lint
       shell: bash
diff --git a/.github/actions/regenerate-protobufs/action.yml b/.github/actions/regenerate-protobufs/action.yml
index dfc65512..6da2a7a4 100644
--- a/.github/actions/regenerate-protobufs/action.yml
+++ b/.github/actions/regenerate-protobufs/action.yml
@@ -6,5 +6,5 @@ runs:
   using: "composite"
   steps:
     - name: Regenerate protobufs
-      run: nix develop -c just regenerate-protobufs
+      run: nix --extra-experimental-features nix-command --extra-experimental-features flakes develop -c just regenerate-protobufs
       shell: bash
diff --git a/.github/actions/typecheck/action.yml b/.github/actions/typecheck/action.yml
index ba61737f..cd52d6e3 100644
--- a/.github/actions/typecheck/action.yml
+++ b/.github/actions/typecheck/action.yml
@@ -1,12 +1,12 @@
 name: Type Check
 
-description: "Run static type checker"
+description: "Run type checker"
 
 runs:
   using: "composite"
   steps:
     - name: Run type checker
       run: |
-        nix develop -c just sync
-        nix develop -c just check
+        nix --extra-experimental-features nix-command --extra-experimental-features flakes develop -c just sync
+        nix --extra-experimental-features nix-command --extra-experimental-features flakes develop -c just check
       shell: bash
diff --git a/.github/actions/unit-test/action.yml b/.github/actions/unit-test/action.yml
new file mode 100644
index 00000000..65f5e07b
--- /dev/null
+++ b/.github/actions/unit-test/action.yml
@@ -0,0 +1,12 @@
+name: Unit Test
+
+description: "Run unit tests"
+
+runs:
+  using: "composite"
+  steps:
+    - name: Run unit tests
+      run: |
+        nix --extra-experimental-features nix-command --extra-experimental-features flakes develop -c just sync-clean
+        nix --extra-experimental-features nix-command --extra-experimental-features flakes develop -c just test-fast
+      shell: bash
diff --git a/.github/workflows/e2e_test.yml b/.github/workflows/e2e_test.yml
new file mode 100644
index 00000000..9b512e0e
--- /dev/null
+++ b/.github/workflows/e2e_test.yml
@@ -0,0 +1,360 @@
+name: macOS System Info
+
+on:
+  workflow_dispatch:  # This allows manual triggering
+  # push:
+  #   branches: [ '*' ]
+  #   tags: [ '*' ]
+
+jobs:
+  master:
+    runs-on: ['self-hosted', 'macOS']
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          lfs: true
+
+      - name: Configure git user
+        run: |
+          git config --local user.email "github-actions@users.noreply.github.com"
+          git config --local user.name  "github-actions bot"
+        shell: bash
+
+      - name: Pull LFS files
+        run: |
+          echo "Pulling Git LFS files..."
+          git lfs pull
+        shell: bash
+
+      - name: Reset databases
+        run: |
+          if [ -d ~/.exo ]; then
+            rm -rf ~/.exo/*.db*
+          fi
+
+      - name: Setup EXO_HOME and API_PORT
+        run: |
+          EXO_HOME=$(mktemp -d -t exo-e2e-master-XXXXXXXX)
+          # Generate random port (macOS compatible method)
+          API_PORT=$((49152 + RANDOM % (65535 - 49152 + 1)))
+          echo "EXO_HOME=$EXO_HOME" >> $GITHUB_ENV
+          echo "API_PORT=$API_PORT" >> $GITHUB_ENV
+          echo "Created EXO_HOME: $EXO_HOME"
+          echo "Generated API_PORT: $API_PORT"
+          echo "Verifying API_PORT is set: $API_PORT"
+        shell: bash
+
+      - name: Setup Nix Environment
+        run: |
+          echo "Checking for nix installation..."
+
+          # Check if nix binary exists directly
+          if [ -f /nix/var/nix/profiles/default/bin/nix ]; then
+            echo "Found nix binary at /nix/var/nix/profiles/default/bin/nix"
+            export PATH="/nix/var/nix/profiles/default/bin:$PATH"
+            echo "PATH=$PATH" >> $GITHUB_ENV
+            nix --version
+          elif [ -f /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh ]; then
+            echo "Found nix profile script, sourcing..."
+            source /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh
+            nix --version
+          elif command -v nix >/dev/null 2>&1; then
+            echo "Nix already in PATH"
+            nix --version
+          else
+            echo "Nix not found. Debugging info:"
+            echo "Contents of /nix/var/nix/profiles/default/:"
+            ls -la /nix/var/nix/profiles/default/ 2>/dev/null || echo "Directory not found"
+            echo "Contents of /nix/var/nix/profiles/default/bin/:"
+            ls -la /nix/var/nix/profiles/default/bin/ 2>/dev/null || echo "Directory not found"
+            exit 1
+          fi
+        shell: bash
+
+      - name: Print macOS system information
+        run: |
+          echo "=== macOS System Information ==="
+          echo "OS Version:"
+          sw_vers
+
+          echo -e "\n=== Memory Information ==="
+          system_profiler SPMemoryDataType
+
+          echo -e "\n=== Memory Usage Summary ==="
+          vm_stat | perl -ne '/page size of (\d+)/ and $size=$1; /Pages free: (\d+)/ and printf "Free Memory: %.2f GB\n", $1 * $size / 1024 / 1024 / 1024'
+          top -l 1 -s 0 | grep PhysMem
+
+          echo -e "\n=== CPU Information ==="
+          sysctl -n machdep.cpu.brand_string
+          system_profiler SPHardwareDataType | grep -E "Cores|Processors"
+
+          echo -e "\n=== Disk Space ==="
+          df -h /
+
+      # - name: Setup Hugging Face token
+      #   run: |
+      #     mkdir -p ~/.cache/huggingface
+      #     echo "${{ secrets.HF_TOKEN }}" > ~/.cache/huggingface/token
+
+      - name: Sync dependencies
+        run: |
+          echo "Running just sync-clean to ensure clean dependencies..."
+          nix --extra-experimental-features nix-command --extra-experimental-features flakes develop --command just sync-clean
+        shell: bash
+
+      - name: Build forwarder
+        run: |
+          echo "Building Go forwarder binary..."
+          nix --extra-experimental-features nix-command --extra-experimental-features flakes develop --command just build-forwarder
+        shell: bash
+
+      - name: Start node (master)
+        run: |
+          echo "Starting master node with debug enabled..."
+          echo "Environment check - API_PORT: '$API_PORT'"
+          echo "Environment check - EXO_HOME: '$EXO_HOME'"
+          if [ -z "$API_PORT" ]; then
+            echo "ERROR: API_PORT is not set!"
+            exit 1
+          fi
+          # Run with Python unbuffered output and maximum debug level
+          nix --extra-experimental-features nix-command --extra-experimental-features flakes develop --command bash -c "EXO_HOME=$EXO_HOME API_PORT=$API_PORT PYTHONUNBUFFERED=1 PYTHONDEBUG=1 PYTHONPATH=. uv run master/main.py" > /tmp/master_node.log 2>&1 &
+          MASTER_PID=$!
+          echo "Started master node in background with PID: $MASTER_PID"
+          echo "Log file: /tmp/master_node.log"
+
+          echo "Starting worker node..."
+          nix --extra-experimental-features nix-command --extra-experimental-features flakes develop --command bash -c "EXO_HOME=$EXO_HOME PYTHONUNBUFFERED=1 PYTHONDEBUG=1 PYTHONPATH=. uv run worker/main.py" > /tmp/worker_node.log 2>&1 &
+          WORKER_PID=$!
+          echo "Started worker node in background with PID: $WORKER_PID"
+          echo "Log file: /tmp/worker_node.log"
+
+          for i in {1..30}; do
+            echo "Attempt $i: Checking if master node is ready..."
+            if curl -s http://localhost:$API_PORT/state > /dev/null 2>&1; then
+              echo "Master node is ready!"
+              break
+            fi
+            if [ $i -eq 30 ]; then
+              echo "Master node failed to start within 30 seconds. Checking logs..."
+              echo "=== Master node log ==="
+              cat /tmp/master_node.log || echo "No master log file found"
+              echo "=== Worker node log ==="
+              cat /tmp/worker_node.log || echo "No worker log file found"
+              exit 1
+            fi
+            sleep 1
+          done
+
+          # wait for master to have a COMPLETE or FAILED task in the state
+          for i in {1..30}; do
+            if curl -s http://localhost:$API_PORT/state | jq -r '.tasks | any(.task_status == "COMPLETE" or .task_status == "FAILED")' > 0; then
+              echo "Master node has a COMPLETE or FAILED task in the state"
+              break
+            fi
+            sleep 1
+          done
+
+          echo "=== Master node log ==="
+          cat /tmp/master_node.log || echo "No master log file found"
+          echo "=== Worker node log ==="
+          cat /tmp/worker_node.log || echo "No worker log file found"
+
+      - name: Cleanup EXO_HOME
+        run: |
+          echo "Cleaning up EXO_HOME: $EXO_HOME"
+          rm -rf "$EXO_HOME"
+        shell: bash
+        if: always()
+
+  worker:
+    runs-on: ['self-hosted', 'macOS']
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          lfs: true
+
+      - name: Configure git user
+        run: |
+          git config --local user.email "github-actions@users.noreply.github.com"
+          git config --local user.name  "github-actions bot"
+        shell: bash
+
+      - name: Pull LFS files
+        run: |
+          echo "Pulling Git LFS files..."
+          git lfs pull
+        shell: bash
+
+      - name: Reset databases
+        run: |
+          if [ -d ~/.exo ]; then
+            rm -rf ~/.exo/*.db*
+          fi
+
+      - name: Setup EXO_HOME and API_PORT
+        run: |
+          EXO_HOME=$(mktemp -d -t exo-e2e-worker-XXXXXXXX)
+          # Generate random port (macOS compatible method)
+          API_PORT=$((49152 + RANDOM % (65535 - 49152 + 1)))
+          echo "EXO_HOME=$EXO_HOME" >> $GITHUB_ENV
+          echo "API_PORT=$API_PORT" >> $GITHUB_ENV
+          echo "Created EXO_HOME: $EXO_HOME"
+          echo "Generated API_PORT: $API_PORT"
+          echo "Verifying API_PORT is set: $API_PORT"
+        shell: bash
+
+      - name: Setup Nix Environment
+        run: |
+          echo "Checking for nix installation..."
+
+          # Check if nix binary exists directly
+          if [ -f /nix/var/nix/profiles/default/bin/nix ]; then
+            echo "Found nix binary at /nix/var/nix/profiles/default/bin/nix"
+            export PATH="/nix/var/nix/profiles/default/bin:$PATH"
+            echo "PATH=$PATH" >> $GITHUB_ENV
+            nix --version
+          elif [ -f /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh ]; then
+            echo "Found nix profile script, sourcing..."
+            source /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh
+            nix --version
+          elif command -v nix >/dev/null 2>&1; then
+            echo "Nix already in PATH"
+            nix --version
+          else
+            echo "Nix not found. Debugging info:"
+            echo "Contents of /nix/var/nix/profiles/default/:"
+            ls -la /nix/var/nix/profiles/default/ 2>/dev/null || echo "Directory not found"
+            echo "Contents of /nix/var/nix/profiles/default/bin/:"
+            ls -la /nix/var/nix/profiles/default/bin/ 2>/dev/null || echo "Directory not found"
+            exit 1
+          fi
+        shell: bash
+
+      - name: Print macOS system information
+        run: |
+          echo "=== macOS System Information ==="
+          echo "OS Version:"
+          sw_vers
+
+          echo -e "\n=== Memory Information ==="
+          system_profiler SPMemoryDataType
+
+          echo -e "\n=== Memory Usage Summary ==="
+          vm_stat | perl -ne '/page size of (\d+)/ and $size=$1; /Pages free: (\d+)/ and printf "Free Memory: %.2f GB\n", $1 * $size / 1024 / 1024 / 1024'
+          top -l 1 -s 0 | grep PhysMem
+
+          echo -e "\n=== CPU Information ==="
+          sysctl -n machdep.cpu.brand_string
+          system_profiler SPHardwareDataType | grep -E "Cores|Processors"
+
+          echo -e "\n=== Disk Space ==="
+          df -h /
+
+      # - name: Setup Hugging Face token
+      #   run: |
+      #     mkdir -p ~/.cache/huggingface
+      #     echo "${{ secrets.HF_TOKEN }}" > ~/.cache/huggingface/token
+
+      - name: Sync dependencies
+        run: |
+          echo "Running just sync-clean to ensure clean dependencies..."
+          nix --extra-experimental-features nix-command --extra-experimental-features flakes develop --command just sync-clean
+        shell: bash
+
+      - name: Build forwarder
+        run: |
+          echo "Building Go forwarder binary..."
+          nix --extra-experimental-features nix-command --extra-experimental-features flakes develop --command just build-forwarder
+        shell: bash
+
+      - name: Start node (replica)
+        run: |
+          echo "Starting master node with debug enabled..."
+          echo "Environment check - API_PORT: '$API_PORT'"
+          echo "Environment check - EXO_HOME: '$EXO_HOME'"
+          if [ -z "$API_PORT" ]; then
+            echo "ERROR: API_PORT is not set!"
+            exit 1
+          fi
+          # Run with Python unbuffered output and maximum debug level
+          nix --extra-experimental-features nix-command --extra-experimental-features flakes develop --command bash -c "EXO_RUN_AS_REPLICA=1 EXO_HOME=$EXO_HOME API_PORT=$API_PORT PYTHONUNBUFFERED=1 PYTHONDEBUG=1 PYTHONPATH=. uv run master/main.py" > /tmp/master_node.log 2>&1 &
+          MASTER_PID=$!
+          echo "Started master node in background with PID: $MASTER_PID"
+          echo "Log file: /tmp/master_node.log"
+
+          echo "Starting worker node..."
+          nix --extra-experimental-features nix-command --extra-experimental-features flakes develop --command bash -c "EXO_HOME=$EXO_HOME PYTHONUNBUFFERED=1 PYTHONDEBUG=1 PYTHONPATH=. uv run worker/main.py" > /tmp/worker_node.log 2>&1 &
+          WORKER_PID=$!
+          echo "Started worker node in background with PID: $WORKER_PID"
+          echo "Log file: /tmp/worker_node.log"
+
+          echo "Waiting for master node to start on port $API_PORT..."
+          # Wait for the master node to be ready (up to 30 seconds)
+          for i in {1..30}; do
+            echo "Attempt $i: Checking if master node is ready..."
+            if curl -s http://localhost:$API_PORT/state > /dev/null 2>&1; then
+              echo "Master node is ready!"
+              break
+            fi
+            if [ $i -eq 30 ]; then
+              echo "Master node failed to start within 30 seconds. Checking logs..."
+              echo "=== Master node log ==="
+              cat /tmp/master_node.log || echo "No master log file found"
+              echo "=== Worker node log ==="
+              cat /tmp/worker_node.log || echo "No worker log file found"
+              exit 1
+            fi
+            sleep 1
+          done
+
+          resp=$(curl -X POST http://localhost:$API_PORT/instance -H "Content-Type: application/json" -d '{"model_id": "llama-3.2:1b"}')
+          echo "Response: $resp"
+          instance_id=$(echo $resp | jq -r '.instance_id')
+          echo "Instance ID: $instance_id"
+
+          for i in {1..50}; do
+            resp=$(curl -s -w "%{http_code}" -X GET http://localhost:$API_PORT/instance/$instance_id -H "Content-Type: application/json")
+            http_code="${resp: -3}"
+            response_body="${resp%???}"
+            echo "HTTP Code: $http_code"
+            echo "Response: $response_body"
+
+            if [ "$http_code" == "200" ]; then
+              instance_status=$(echo $response_body | jq -r '.instance_type')
+              if [ "$instance_status" == "ACTIVE" ]; then
+                echo "Instance is ready"
+                break
+              fi
+            elif [ "$http_code" == "404" ]; then
+              echo "Instance not yet created, waiting..."
+            else
+              echo "Unexpected HTTP status: $http_code"
+            fi
+            sleep 1
+          done
+
+          resp=$(curl http://localhost:$API_PORT/v1/chat/completions -H "Content-Type: application/json" -d '{"model": "llama-3.2:1b", "messages": [{"role": "user", "content": "What is the meaning of exo?"}], "temperature": 0.7}')
+          echo "Response: $resp"
+
+          resp=$(curl -X DELETE http://localhost:$API_PORT/instance/$instance_id -H "Content-Type: application/json")
+          echo "Response: $resp"
+
+          echo "=== Master node log ==="
+          cat /tmp/master_node.log || echo "No master log file found"
+          echo "=== Worker node log ==="
+          cat /tmp/worker_node.log || echo "No worker log file found"
+
+          kill $MASTER_PID
+          kill $WORKER_PID
+
+      - name: Cleanup EXO_HOME
+        run: |
+          echo "Cleaning up EXO_HOME: $EXO_HOME"
+          rm -rf "$EXO_HOME"
+        shell: bash
+        if: always()
diff --git a/.github/workflows/pipeline.yml b/.github/workflows/pipeline.yml
index e2834848..71ba82f8 100644
--- a/.github/workflows/pipeline.yml
+++ b/.github/workflows/pipeline.yml
@@ -12,9 +12,12 @@ on:
 
 jobs:
   typecheck:
-    runs-on: ubuntu-22.04
+    runs-on: ['self-hosted', 'macOS']
     steps:
-      - uses: actions/checkout@v4
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          lfs: true
 
       - name: Configure git user
         run: |
@@ -22,23 +25,54 @@ jobs:
           git config --local user.name  "github-actions bot"
         shell: bash
 
-      - uses: cachix/install-nix-action@v31
-        with:
-          github_access_token: ${{ secrets.GITHUB_TOKEN }}
+      - name: Pull LFS files
+        run: |
+          echo "Pulling Git LFS files..."
+          git lfs pull
+        shell: bash
+
+      - name: Setup Nix Environment
+        run: |
+          echo "Checking for nix installation..."
+          
+          # Check if nix binary exists directly
+          if [ -f /nix/var/nix/profiles/default/bin/nix ]; then
+            echo "Found nix binary at /nix/var/nix/profiles/default/bin/nix"
+            export PATH="/nix/var/nix/profiles/default/bin:$PATH"
+            echo "PATH=$PATH" >> $GITHUB_ENV
+            nix --version
+          elif [ -f /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh ]; then
+            echo "Found nix profile script, sourcing..."
+            source /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh
+            nix --version
+          elif command -v nix >/dev/null 2>&1; then
+            echo "Nix already in PATH"
+            nix --version
+          else
+            echo "Nix not found. Debugging info:"
+            echo "Contents of /nix/var/nix/profiles/default/:"
+            ls -la /nix/var/nix/profiles/default/ 2>/dev/null || echo "Directory not found"
+            echo "Contents of /nix/var/nix/profiles/default/bin/:"
+            ls -la /nix/var/nix/profiles/default/bin/ 2>/dev/null || echo "Directory not found"
+            exit 1
+          fi
+        shell: bash
 
       - uses: ./.github/actions/typecheck
   ci:
     needs: typecheck
-    runs-on: ubuntu-22.04
+    runs-on: ['self-hosted', 'macOS']
     permissions:
       contents: read
     env:
       GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
     steps:
-      - uses: actions/checkout@v4
+      - name: Checkout repository
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
           token: ${{ secrets.GITHUB_TOKEN }}
+          lfs: true
 
       - name: Configure git user
         run: |
@@ -46,12 +80,67 @@ jobs:
           git config --local user.name  "github-actions bot"
         shell: bash
 
-      - uses: cachix/install-nix-action@v31
-        with:
-          github_access_token: ${{ secrets.GITHUB_TOKEN }}
+      - name: Pull LFS files
+        run: |
+          echo "Pulling Git LFS files..."
+          git lfs pull
+        shell: bash
+
+      - name: Setup EXO_HOME and API_PORT
+        run: |
+          EXO_HOME=$(mktemp -d -t exo-ci-XXXXXXXX)
+          # Generate random port (macOS compatible method)
+          API_PORT=$((49152 + RANDOM % (65535 - 49152 + 1)))
+          echo "EXO_HOME=$EXO_HOME" >> $GITHUB_ENV
+          echo "API_PORT=$API_PORT" >> $GITHUB_ENV
+          echo "Created EXO_HOME: $EXO_HOME"
+          echo "Generated API_PORT: $API_PORT"
+        shell: bash
+
+      - name: Setup Nix Environment
+        run: |
+          echo "Checking for nix installation..."
+          
+          # Check if nix binary exists directly
+          if [ -f /nix/var/nix/profiles/default/bin/nix ]; then
+            echo "Found nix binary at /nix/var/nix/profiles/default/bin/nix"
+            export PATH="/nix/var/nix/profiles/default/bin:$PATH"
+            echo "PATH=$PATH" >> $GITHUB_ENV
+            nix --version
+          elif [ -f /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh ]; then
+            echo "Found nix profile script, sourcing..."
+            source /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh
+            nix --version
+          elif command -v nix >/dev/null 2>&1; then
+            echo "Nix already in PATH"
+            nix --version
+          else
+            echo "Nix not found. Debugging info:"
+            echo "Contents of /nix/var/nix/profiles/default/:"
+            ls -la /nix/var/nix/profiles/default/ 2>/dev/null || echo "Directory not found"
+            echo "Contents of /nix/var/nix/profiles/default/bin/:"
+            ls -la /nix/var/nix/profiles/default/bin/ 2>/dev/null || echo "Directory not found"
+            exit 1
+          fi
+        shell: bash
+
+      - name: Build forwarder
+        run: |
+          echo "Building Go forwarder binary..."
+          nix --extra-experimental-features nix-command --extra-experimental-features flakes develop --command just build-forwarder
+        shell: bash
 
       - uses: ./.github/actions/verify-clean
         with:
           step: regenerate-protobufs
 
-      - uses: ./.github/actions/lint-check
\ No newline at end of file
+      - uses: ./.github/actions/lint-check
+
+      - uses: ./.github/actions/unit-test
+
+      - name: Cleanup EXO_HOME
+        run: |
+          echo "Cleaning up EXO_HOME: $EXO_HOME"
+          rm -rf "$EXO_HOME"
+        shell: bash
+        if: always()
diff --git a/engines/mlx/utils_mlx.py b/engines/mlx/utils_mlx.py
index 1b77413f..1dde2e14 100644
--- a/engines/mlx/utils_mlx.py
+++ b/engines/mlx/utils_mlx.py
@@ -1,6 +1,7 @@
 import asyncio
 import concurrent.futures
 import os
+import resource
 from asyncio import AbstractEventLoop
 from typing import Any, Callable
 
@@ -18,6 +19,8 @@ from shared.types.worker.shards import ShardMetadata
 from worker.download.download_utils import build_model_path
 from worker.runner.communication import runner_print
 
+# Needed for 8 bit model
+resource.setrlimit(resource.RLIMIT_NOFILE, (2048, 4096))
 
 def mx_barrier():
     mx.eval( # type: ignore
@@ -86,6 +89,7 @@ def shard_and_load(model_shard_meta: ShardMetadata) -> tuple[nn.Module, Tokenize
     tokenizer = load_tokenizer(model_path)
     assert isinstance(tokenizer, TokenizerWrapper)
     model = auto_parallel(model, model_shard_meta)
+    mx.eval(model.parameters()) # type: ignore
 
     # Synchronize processes before generation to avoid timeout
     mx_barrier()
diff --git a/justfile b/justfile
index 5b92d3c4..871eec6d 100644
--- a/justfile
+++ b/justfile
@@ -19,6 +19,9 @@ lint-check:
 test:
     uv run pytest master worker shared engines/*
 
+test-fast:
+    uv run pytest master shared engines/*
+
 check:
     uv run basedpyright --project pyproject.toml
 
diff --git a/master/discovery_supervisor.py b/master/discovery_supervisor.py
index 440d512b..08f2c072 100644
--- a/master/discovery_supervisor.py
+++ b/master/discovery_supervisor.py
@@ -48,7 +48,10 @@ class DiscoverySupervisor:
         local_multiaddr = Multiaddr(address=str(e.local_addr))
         send_back_multiaddr = Multiaddr(address=str(e.send_back_addr))
         connection_profile = None
-
+        
+        if send_back_multiaddr.ipv4_address == local_multiaddr.ipv4_address:
+            return
+        
         topology_edge_created = TopologyEdgeCreated(edge=Connection(
             local_node_id=local_node_id,
             send_back_node_id=send_back_node_id,
@@ -56,7 +59,7 @@ class DiscoverySupervisor:
             send_back_multiaddr=send_back_multiaddr,
             connection_profile=connection_profile
         ))
-        self.logger.error(
+        self.logger.info(
             msg=f"CONNECTED CALLBACK: {local_node_id} -> {send_back_node_id}, {local_multiaddr} -> {send_back_multiaddr}")
         await self.global_events.append_events(
             [topology_edge_created],
diff --git a/master/forwarder_supervisor.py b/master/forwarder_supervisor.py
index 979d362e..4e7fa918 100644
--- a/master/forwarder_supervisor.py
+++ b/master/forwarder_supervisor.py
@@ -111,6 +111,7 @@ class ForwarderSupervisor:
         env_vars["FORWARDER_NODE_ID"] = str(self.node_id)
         self._process = await asyncio.create_subprocess_exec(
             str(self._binary_path),
+            "--events-db", str(EXO_WORKER_EVENT_DB),
             f'{pairs}',
             stdout=None,
             stderr=None,
diff --git a/master/main.py b/master/main.py
index 2ce5ed8b..0b991e96 100644
--- a/master/main.py
+++ b/master/main.py
@@ -9,7 +9,8 @@ from typing import List
 from exo_pyo3_bindings import Keypair
 
 from master.api import start_fastapi_server
-from master.discovery_supervisor import DiscoverySupervisor
+
+# from master.discovery_supervisor import DiscoverySupervisor
 from master.election_callback import ElectionCallbacks
 from master.forwarder_supervisor import ForwarderRole, ForwarderSupervisor
 from master.placement import get_instance_placements, get_transition_events
@@ -45,13 +46,13 @@ class Master:
         self.command_buffer = command_buffer
         self.global_events = global_events
         self.worker_events = worker_events
-        self.discovery_supervisor = DiscoverySupervisor(
-            node_id_keypair,
-            node_id,
-            # TODO: needs to be more general for when we have master election
-            worker_events if os.getenv('EXO_RUN_AS_REPLICA') in set(['TRUE', 'true', '1']) else global_events,
-            logger
-        )
+        # self.discovery_supervisor = DiscoverySupervisor(
+        #     node_id_keypair,
+        #     node_id,
+        #     # TODO: needs to be more general for when we have master election
+        #     worker_events if os.getenv('EXO_RUN_AS_REPLICA') in set(['TRUE', 'true', '1']) else global_events,
+        #     logger
+        # )
         self.forwarder_supervisor = ForwarderSupervisor(
             self.node_id,
             forwarder_binary_path=forwarder_binary_path,
@@ -116,7 +117,7 @@ class Master:
 
             await self.event_log_for_writes.append_events(next_events, origin=self.node_id)
         # 2. get latest events
-        events = await self.event_log_for_reads.get_events_since(self.state.last_event_applied_idx)
+        events = await self.event_log_for_reads.get_events_since(self.state.last_event_applied_idx, ignore_no_op_events=True)
         if len(events) == 0:
             await asyncio.sleep(0.01)
             return
@@ -157,7 +158,7 @@ class Master:
 
 async def main():
     logger = logging.getLogger('master_logger')
-    logger.setLevel(logging.DEBUG)
+    logger.setLevel(logging.INFO)
     if not logger.handlers:
         handler = logging.StreamHandler()
         handler.setFormatter(logging.Formatter('%(asctime)s - %(levelname)s - %(message)s'))
diff --git a/master/tests/test_topology.py b/master/tests/test_topology.py
index 151ef0c3..9172adbb 100644
--- a/master/tests/test_topology.py
+++ b/master/tests/test_topology.py
@@ -114,8 +114,7 @@ def test_remove_connection_still_connected(topology: Topology, node_profile: Nod
     topology.remove_connection(connection)
 
     # assert
-    with pytest.raises(IndexError):
-        topology.get_connection_profile(connection)
+    assert topology.get_connection_profile(connection) is None
 
 
 def test_remove_connection_bridge(topology: Topology, node_profile: NodePerformanceProfile, connection: Connection):
@@ -129,7 +128,9 @@ def test_remove_connection_bridge(topology: Topology, node_profile: NodePerforma
     topology.add_node(Node(node_id=master_id, node_profile=node_profile))
     topology.add_node(Node(node_id=node_a_id, node_profile=node_profile))
     topology.add_node(Node(node_id=node_b_id, node_profile=node_profile))
-
+    
+    topology.set_master_node_id(master_id)
+    
     connection_master_to_a = Connection(
         local_node_id=master_id,
         send_back_node_id=node_a_id,
@@ -157,11 +158,8 @@ def test_remove_connection_bridge(topology: Topology, node_profile: NodePerforma
     assert len(remaining_nodes) == 1
     assert remaining_nodes[0].node_id == master_id
 
-    with pytest.raises(KeyError):
-        topology.get_node_profile(node_a_id)
-
-    with pytest.raises(KeyError):
-        topology.get_node_profile(node_b_id)
+    assert topology.get_node_profile(node_a_id) is None
+    assert topology.get_node_profile(node_b_id) is None
 
 
 def test_remove_node_still_connected(topology: Topology, node_profile: NodePerformanceProfile, connection: Connection):
@@ -174,8 +172,7 @@ def test_remove_node_still_connected(topology: Topology, node_profile: NodePerfo
     topology.remove_node(connection.local_node_id)
 
     # assert
-    with pytest.raises(KeyError):
-        topology.get_node_profile(connection.local_node_id)
+    assert topology.get_node_profile(connection.local_node_id) is None
 
 
 def test_list_nodes(topology: Topology, node_profile: NodePerformanceProfile, connection: Connection):
diff --git a/networking/forwarder/go.mod b/networking/forwarder/go.mod
index b7100a6a..8c3a2aae 100644
--- a/networking/forwarder/go.mod
+++ b/networking/forwarder/go.mod
@@ -1,16 +1,17 @@
 module forwarder
 
-go 1.23
+go 1.23.8
 
 toolchain go1.24.3
 
 replace forwarder/src => ./src
 
 require (
-    github.com/google/uuid v1.6.0
-	github.com/libp2p/go-libp2p v0.39.1
+	github.com/google/uuid v1.6.0
+	github.com/libp2p/go-libp2p v0.42.1
 	github.com/libp2p/go-libp2p-pubsub v0.14.2
 	github.com/mattn/go-sqlite3 v1.14.28
+	github.com/multiformats/go-multiaddr v0.16.0
 	github.com/stretchr/testify v1.10.0
 )
 
@@ -18,110 +19,99 @@ require (
 	github.com/benbjohnson/clock v1.3.5 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
-	github.com/containerd/cgroups v1.1.0 // indirect
-	github.com/coreos/go-systemd/v22 v22.5.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/davidlazar/go-crypto v0.0.0-20200604182044-b73af7476f6c // indirect
-	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.3.0 // indirect
-	github.com/docker/go-units v0.5.0 // indirect
-	github.com/elastic/gosigar v0.14.3 // indirect
+	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.4.0 // indirect
 	github.com/flynn/noise v1.1.0 // indirect
 	github.com/francoispqt/gojay v1.2.13 // indirect
 	github.com/go-task/slim-sprig/v3 v3.0.0 // indirect
-	github.com/godbus/dbus/v5 v5.1.0 // indirect
 	github.com/gogo/protobuf v1.3.2 // indirect
 	github.com/google/gopacket v1.1.19 // indirect
-	github.com/google/pprof v0.0.0-20250202011525-fc3143867406 // indirect
+	github.com/google/pprof v0.0.0-20250607225305-033d6d78b36a // indirect
 	github.com/gorilla/websocket v1.5.3 // indirect
 	github.com/hashicorp/golang-lru/v2 v2.0.7 // indirect
 	github.com/huin/goupnp v1.3.0 // indirect
 	github.com/ipfs/go-cid v0.5.0 // indirect
-	github.com/ipfs/go-log/v2 v2.5.1 // indirect
+	github.com/ipfs/go-log/v2 v2.6.0 // indirect
 	github.com/jackpal/go-nat-pmp v1.0.2 // indirect
 	github.com/jbenet/go-temp-err-catcher v0.1.0 // indirect
-	github.com/klauspost/compress v1.17.11 // indirect
-	github.com/klauspost/cpuid/v2 v2.2.9 // indirect
-	github.com/koron/go-ssdp v0.0.5 // indirect
+	github.com/klauspost/compress v1.18.0 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.10 // indirect
+	github.com/koron/go-ssdp v0.0.6 // indirect
 	github.com/libp2p/go-buffer-pool v0.1.0 // indirect
 	github.com/libp2p/go-flow-metrics v0.2.0 // indirect
 	github.com/libp2p/go-libp2p-asn-util v0.4.1 // indirect
 	github.com/libp2p/go-msgio v0.3.0 // indirect
-	github.com/libp2p/go-nat v0.2.0 // indirect
 	github.com/libp2p/go-netroute v0.2.2 // indirect
 	github.com/libp2p/go-reuseport v0.4.0 // indirect
-	github.com/libp2p/go-yamux/v4 v4.0.2 // indirect
+	github.com/libp2p/go-yamux/v5 v5.0.1 // indirect
 	github.com/libp2p/zeroconf/v2 v2.2.0 // indirect
 	github.com/marten-seemann/tcp v0.0.0-20210406111302-dfbc87cc63fd // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
-	github.com/miekg/dns v1.1.63 // indirect
+	github.com/miekg/dns v1.1.66 // indirect
 	github.com/mikioh/tcpinfo v0.0.0-20190314235526-30a79bb1804b // indirect
 	github.com/mikioh/tcpopt v0.0.0-20190314235656-172688c1accc // indirect
 	github.com/minio/sha256-simd v1.0.1 // indirect
 	github.com/mr-tron/base58 v1.2.0 // indirect
 	github.com/multiformats/go-base32 v0.1.0 // indirect
 	github.com/multiformats/go-base36 v0.2.0 // indirect
-	github.com/multiformats/go-multiaddr v0.14.0 // indirect
 	github.com/multiformats/go-multiaddr-dns v0.4.1 // indirect
 	github.com/multiformats/go-multiaddr-fmt v0.1.0 // indirect
 	github.com/multiformats/go-multibase v0.2.0 // indirect
-	github.com/multiformats/go-multicodec v0.9.0 // indirect
+	github.com/multiformats/go-multicodec v0.9.1 // indirect
 	github.com/multiformats/go-multihash v0.2.3 // indirect
-	github.com/multiformats/go-multistream v0.6.0 // indirect
+	github.com/multiformats/go-multistream v0.6.1 // indirect
 	github.com/multiformats/go-varint v0.0.7 // indirect
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
-	github.com/onsi/ginkgo/v2 v2.22.2 // indirect
-	github.com/opencontainers/runtime-spec v1.2.0 // indirect
+	github.com/onsi/ginkgo/v2 v2.23.4 // indirect
 	github.com/pbnjay/memory v0.0.0-20210728143218-7b4eea64cf58 // indirect
 	github.com/pion/datachannel v1.5.10 // indirect
 	github.com/pion/dtls/v2 v2.2.12 // indirect
-	github.com/pion/dtls/v3 v3.0.4 // indirect
-	github.com/pion/ice/v2 v2.3.37 // indirect
-	github.com/pion/ice/v4 v4.0.6 // indirect
-	github.com/pion/interceptor v0.1.37 // indirect
+	github.com/pion/dtls/v3 v3.0.6 // indirect
+	github.com/pion/ice/v4 v4.0.10 // indirect
+	github.com/pion/interceptor v0.1.40 // indirect
 	github.com/pion/logging v0.2.3 // indirect
-	github.com/pion/mdns v0.0.12 // indirect
 	github.com/pion/mdns/v2 v2.0.7 // indirect
 	github.com/pion/randutil v0.1.0 // indirect
 	github.com/pion/rtcp v1.2.15 // indirect
-	github.com/pion/rtp v1.8.11 // indirect
-	github.com/pion/sctp v1.8.35 // indirect
-	github.com/pion/sdp/v3 v3.0.10 // indirect
-	github.com/pion/srtp/v3 v3.0.4 // indirect
+	github.com/pion/rtp v1.8.19 // indirect
+	github.com/pion/sctp v1.8.39 // indirect
+	github.com/pion/sdp/v3 v3.0.13 // indirect
+	github.com/pion/srtp/v3 v3.0.6 // indirect
 	github.com/pion/stun v0.6.1 // indirect
 	github.com/pion/stun/v3 v3.0.0 // indirect
 	github.com/pion/transport/v2 v2.2.10 // indirect
 	github.com/pion/transport/v3 v3.0.7 // indirect
-	github.com/pion/turn/v2 v2.1.6 // indirect
-	github.com/pion/turn/v4 v4.0.0 // indirect
-	github.com/pion/webrtc/v4 v4.0.8 // indirect
-	github.com/pkg/errors v0.9.1 // indirect
+	github.com/pion/turn/v4 v4.0.2 // indirect
+	github.com/pion/webrtc/v4 v4.1.2 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/prometheus/client_golang v1.20.5 // indirect
-	github.com/prometheus/client_model v0.6.1 // indirect
-	github.com/prometheus/common v0.62.0 // indirect
-	github.com/prometheus/procfs v0.15.1 // indirect
+	github.com/prometheus/client_golang v1.22.0 // indirect
+	github.com/prometheus/client_model v0.6.2 // indirect
+	github.com/prometheus/common v0.64.0 // indirect
+	github.com/prometheus/procfs v0.16.1 // indirect
 	github.com/quic-go/qpack v0.5.1 // indirect
-	github.com/quic-go/quic-go v0.49.0 // indirect
+	github.com/quic-go/quic-go v0.52.0 // indirect
 	github.com/quic-go/webtransport-go v0.8.1-0.20241018022711-4ac2c9250e66 // indirect
-	github.com/raulk/go-watchdog v1.3.0 // indirect
 	github.com/spaolacci/murmur3 v1.1.0 // indirect
 	github.com/wlynxg/anet v0.0.5 // indirect
-	go.uber.org/dig v1.18.0 // indirect
-	go.uber.org/fx v1.23.0 // indirect
-	go.uber.org/mock v0.5.0 // indirect
+	go.uber.org/automaxprocs v1.6.0 // indirect
+	go.uber.org/dig v1.19.0 // indirect
+	go.uber.org/fx v1.24.0 // indirect
+	go.uber.org/mock v0.5.2 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
 	go.uber.org/zap v1.27.0 // indirect
-	golang.org/x/crypto v0.32.0 // indirect
-	golang.org/x/exp v0.0.0-20250128182459-e0ece0dbea4c // indirect
-	golang.org/x/mod v0.23.0 // indirect
-	golang.org/x/net v0.34.0 // indirect
-	golang.org/x/sync v0.11.0 // indirect
-	golang.org/x/sys v0.30.0 // indirect
-	golang.org/x/text v0.22.0 // indirect
-	golang.org/x/tools v0.29.0 // indirect
-	google.golang.org/protobuf v1.36.4 // indirect
+	golang.org/x/crypto v0.39.0 // indirect
+	golang.org/x/exp v0.0.0-20250606033433-dcc06ee1d476 // indirect
+	golang.org/x/mod v0.25.0 // indirect
+	golang.org/x/net v0.41.0 // indirect
+	golang.org/x/sync v0.15.0 // indirect
+	golang.org/x/sys v0.33.0 // indirect
+	golang.org/x/text v0.26.0 // indirect
+	golang.org/x/time v0.12.0 // indirect
+	golang.org/x/tools v0.34.0 // indirect
+	google.golang.org/protobuf v1.36.6 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
-	lukechampine.com/blake3 v1.3.0 // indirect
+	lukechampine.com/blake3 v1.4.1 // indirect
 )
 
 // Remember to run `go mod tidy` after adding dependencies.
diff --git a/networking/forwarder/go.sum b/networking/forwarder/go.sum
index 75e179a9..5ba5ce9e 100644
--- a/networking/forwarder/go.sum
+++ b/networking/forwarder/go.sum
@@ -9,8 +9,6 @@ dmitri.shuralyov.com/state v0.0.0-20180228185332-28bcc343414c/go.mod h1:0PRwlb0D
 git.apache.org/thrift.git v0.0.0-20180902110319-2566ecd5d999/go.mod h1:fPE2ZNJGynbRyZ4dJvy6G277gSllfV2HJqblrnkyeyg=
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@@ -20,33 +18,18 @@ github.com/bradfitz/go-smtpd v0.0.0-20170404230938-deb6d6237625/go.mod h1:HYsPBT
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@@ -60,12 +43,7 @@ github.com/go-logr/logr v1.4.2 h1:6pFjapn8bFcIbiKo3XT4j/BhANplGihG6tvd+8rYgrY=
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@@ -76,18 +54,16 @@ github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5y
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@@ -103,8 +79,8 @@ github.com/huin/goupnp v1.3.0 h1:UvLUlWDNpoUdYzb2TCn+MuTWtcjXKSza2n6CBdQ0xXc=
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@@ -112,15 +88,14 @@ github.com/jbenet/go-temp-err-catcher v0.1.0/go.mod h1:0kJRvmDZXNMIiJirNPEYfhpPw
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@@ -134,8 +109,8 @@ github.com/libp2p/go-buffer-pool v0.1.0 h1:oK4mSFcQz7cTQIfqbe4MIj9gLW+mnanjyFtc6
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@@ -144,21 +119,18 @@ github.com/libp2p/go-libp2p-testing v0.12.0 h1:EPvBb4kKMWO29qP4mZGyhVzUyR25dvfUI
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@@ -166,8 +138,8 @@ github.com/mattn/go-sqlite3 v1.14.28/go.mod h1:Uh1q+B4BYcTPb+yiD3kU8Ct7aC0hY9fxU
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@@ -188,34 +160,31 @@ github.com/multiformats/go-base32 v0.1.0/go.mod h1:Kj3tFY6zNr+ABYMqeUNeGvkIC/UYg
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@@ -224,33 +193,29 @@ github.com/pion/datachannel v1.5.10/go.mod h1:p/jJfC9arb29W7WrxyKbepTU20CFgyx5oL
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@@ -259,45 +224,38 @@ github.com/pion/transport/v2 v2.2.1/go.mod h1:cXXWavvCnFF6McHTft3DWS9iic2Mftcz1A
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@@ -319,10 +277,8 @@ github.com/shurcooL/notifications v0.0.0-20181007000457-627ab5aea122/go.mod h1:b
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@@ -331,9 +287,6 @@ github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+
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@@ -341,7 +294,6 @@ github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXl
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@@ -349,23 +301,20 @@ github.com/wlynxg/anet v0.0.5 h1:J3VJGi1gvo0JwZ/P1/Yc/8p63SoW98B5dHkYDmpgvvU=
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@@ -382,24 +331,22 @@ golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5y
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-golang.org/x/mod v0.4.2/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
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 golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
-golang.org/x/mod v0.23.0 h1:Zb7khfcRGKk+kqfxFaP5tZqCnDZMjC5VtUBs87Hr6QM=
-golang.org/x/mod v0.23.0/go.mod h1:6SkKJ3Xj0I0BrPOZoBy3bdMptDDU9oJrpohJ3eWZ1fY=
+golang.org/x/mod v0.25.0 h1:n7a+ZbQKQA/Ysbyb0/6IbB1H/X41mKgbhfv7AfG/44w=
+golang.org/x/mod v0.25.0/go.mod h1:IXM97Txy2VM4PJ3gI61r1YEk/gAj6zAHN3AdZt6S9Ww=
 golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
@@ -407,7 +354,6 @@ golang.org/x/net v0.0.0-20181029044818-c44066c5c816/go.mod h1:mL1N/T3taQHkDXs73r
 golang.org/x/net v0.0.0-20181106065722-10aee1819953/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20190108225652-1e06a53dbb7e/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
-golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190313220215-9f648a60d977/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
@@ -415,7 +361,6 @@ golang.org/x/net v0.0.0-20200226121028-0de0cce0169b/go.mod h1:z5CRVTTTmAJ677TzLL
 golang.org/x/net v0.0.0-20201021035429-f5854403a974/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
 golang.org/x/net v0.0.0-20210119194325-5f4716e94777/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
 golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
-golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4/go.mod h1:p54w0d4576C0XHj96bSt6lcn1PtDYWL6XObtHCRCNQM=
 golang.org/x/net v0.0.0-20210423184538-5f58ad60dda6/go.mod h1:OJAsFXCWl8Ukc7SiCT/9KSuxbyM7479/AVlXFRxuMCk=
 golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
 golang.org/x/net v0.6.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
@@ -423,8 +368,8 @@ golang.org/x/net v0.9.0/go.mod h1:d48xBJpPfHeWQsugry2m+kC02ZBRGRgulfHnEXEuWns=
 golang.org/x/net v0.10.0/go.mod h1:0qNGK6F8kojg2nk9dLZ2mShWaEBan6FAoqfSigmmuDg=
 golang.org/x/net v0.14.0/go.mod h1:PpSgVXXLK0OxS0F31C1/tv6XNguvCrnXIDrFMspZIUI=
 golang.org/x/net v0.20.0/go.mod h1:z8BVo6PvndSri0LbOE3hAn0apkU+1YvI6E70E9jsnvY=
-golang.org/x/net v0.34.0 h1:Mb7Mrk043xzHgnRM88suvJFwzVrRfHEHJEl5/71CKw0=
-golang.org/x/net v0.34.0/go.mod h1:di0qlW3YNM5oh6GqDGQr92MyTozJPmybPK4Ev/Gm31k=
+golang.org/x/net v0.41.0 h1:vBTly1HeNPEn3wtREYfy4GZ/NECgw2Cnl+nK6Nz3uvw=
+golang.org/x/net v0.41.0/go.mod h1:B/K4NNqkfmg07DQYrbwvSluqCJOOXwUjeb/5lOisjbA=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20181017192945-9dcd33a902f4/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20181203162652-d668ce993890/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
@@ -440,38 +385,31 @@ golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9/go.mod h1:RxMgew5VJxzue5/jJ
 golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.11.0 h1:GGz8+XQP4FvTTrjZPzNKTMFtSXH80RAzG+5ghFPgK9w=
-golang.org/x/sync v0.11.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
-golang.org/x/sys v0.0.0-20180810173357-98c5dad5d1a0/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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 golang.org/x/sys v0.0.0-20181029174526-d69651ed3497/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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 golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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 golang.org/x/sys v0.8.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.9.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.11.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.16.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
-golang.org/x/sys v0.30.0 h1:QjkSwP/36a20jFYWkSue1YwXzLmsV5Gfq7Eiy72C1uc=
-golang.org/x/sys v0.30.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
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 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
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@@ -488,28 +426,25 @@ golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
 golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
 golang.org/x/text v0.12.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=
 golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
-golang.org/x/text v0.22.0 h1:bofq7m3/HAFvbF51jz3Q9wLg3jkvSPuiZu/pD1XwgtM=
-golang.org/x/text v0.22.0/go.mod h1:YRoo4H8PVmsu+E3Ou7cqLVH8oXWIHVoX0jqUWALQhfY=
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+golang.org/x/text v0.26.0/go.mod h1:QK15LZJUUQVJxhz7wXgxSy/CJaTFjd0G+YLonydOVQA=
 golang.org/x/time v0.0.0-20180412165947-fbb02b2291d2/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
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-golang.org/x/tools v0.29.0 h1:Xx0h3TtM9rzQpQuR4dKLrdglAmCEN5Oi+P74JdhdzXE=
-golang.org/x/tools v0.29.0/go.mod h1:KMQVMRsVxU6nHCFXrBPhDB8XncLNLM0lIy/F14RP588=
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+golang.org/x/tools v0.34.0/go.mod h1:pAP9OwEaY1CAW3HOmg3hLZC5Z0CCmzjAF2UQMSqNARg=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
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@@ -530,26 +465,22 @@ google.golang.org/grpc v1.14.0/go.mod h1:yo6s7OP7yaDglbqo1J04qKzAhqBH6lvTonzMVmE
 google.golang.org/grpc v1.16.0/go.mod h1:0JHn/cJsOMiMfNA9+DeHDlAU7KAAB5GDlYFpa9MZMio=
 google.golang.org/grpc v1.17.0/go.mod h1:6QZJwpn2B+Zp71q/5VxRsJ6NXXVCE5NRUHRo+f3cWCs=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
-google.golang.org/protobuf v1.36.4 h1:6A3ZDJHn/eNqc1i+IdefRzy/9PokBTPvcqMySR7NNIM=
-google.golang.org/protobuf v1.36.4/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=
+google.golang.org/protobuf v1.36.6 h1:z1NpPI8ku2WgiWnf+t9wTPsn6eP1L7ksHUlkfLvd9xY=
+google.golang.org/protobuf v1.36.6/go.mod h1:jduwjTPXsFjZGTmRluh+L6NjiWu7pchiJ2/5YcXBHnY=
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-gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
 gopkg.in/inf.v0 v0.9.1/go.mod h1:cWUDdTG/fYaXco+Dcufb5Vnc6Gp2YChqWtbxRZE0mXw=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 grpc.go4.org v0.0.0-20170609214715-11d0a25b4919/go.mod h1:77eQGdRu53HpSqPFJFmuJdjuHRquDANNeA4x7B8WQ9o=
 honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-lukechampine.com/blake3 v1.3.0 h1:sJ3XhFINmHSrYCgl958hscfIa3bw8x4DqMP3u1YvoYE=
-lukechampine.com/blake3 v1.3.0/go.mod h1:0OFRp7fBtAylGVCO40o87sbupkyIGgbpv1+M1k1LM6k=
+lukechampine.com/blake3 v1.4.1 h1:I3Smz7gso8w4/TunLKec6K2fn+kyKtDxr/xcQEN84Wg=
+lukechampine.com/blake3 v1.4.1/go.mod h1:QFosUxmjB8mnrWFSNwKmvxHpfY72bmD2tQ0kBMM3kwo=
 sourcegraph.com/sourcegraph/go-diff v0.5.0/go.mod h1:kuch7UrkMzY0X+p9CRK03kfuPQ2zzQcaEFbx8wA8rck=
 sourcegraph.com/sqs/pbtypes v0.0.0-20180604144634-d3ebe8f20ae4/go.mod h1:ketZ/q3QxT9HOBeFhu6RdvsftgpsbFHBF5Cas6cDKZ0=
diff --git a/networking/forwarder/main.go b/networking/forwarder/main.go
index dd2a9ea4..3699364d 100644
--- a/networking/forwarder/main.go
+++ b/networking/forwarder/main.go
@@ -11,6 +11,7 @@ import (
 )
 
 var nodeID = flag.String("node-id", "", "Node ID (defaults to FORWARDER_NODE_ID env var or a new UUID)")
+var eventsDBPath = flag.String("events-db", "", "Path to the worker events SQLite database")
 
 func main() {
 	flag.Parse()
@@ -23,6 +24,12 @@ func main() {
 	}
 	log.Printf("Starting forwarder with node ID: %s", id)
 
+	// Set the events database path if provided
+	if *eventsDBPath != "" {
+		forwarder.SetEventsDBPath(*eventsDBPath)
+		log.Printf("Using events database: %s", *eventsDBPath)
+	}
+
 	args := flag.Args()
 	if len(args) == 0 {
 		log.Fatal("forwarding pairs argument is required as the first positional argument (of the form {source}|{sink}) where source and sink sqlite:db_file:table_name or libp2p:topic")
diff --git a/networking/forwarder/src/event_writer.go b/networking/forwarder/src/event_writer.go
new file mode 100644
index 00000000..b0ebb9dd
--- /dev/null
+++ b/networking/forwarder/src/event_writer.go
@@ -0,0 +1,259 @@
+package forwarder
+
+import (
+	"database/sql"
+	"encoding/json"
+	"fmt"
+	"log"
+	"strconv"
+	"sync"
+
+	"github.com/google/uuid"
+	"github.com/libp2p/go-libp2p/core/network"
+	_ "github.com/mattn/go-sqlite3"
+	"github.com/multiformats/go-multiaddr"
+)
+
+var (
+	eventsDBPath string
+	eventsDB     *sql.DB
+	eventsDBMu   sync.Mutex
+)
+
+// SetEventsDBPath sets the path to the events database
+func SetEventsDBPath(path string) {
+	eventsDBMu.Lock()
+	defer eventsDBMu.Unlock()
+	eventsDBPath = path
+}
+
+// Event types matching Python's _EventType enum
+const (
+	EventTypeTopologyEdgeCreated = "TopologyEdgeCreated"
+	EventTypeTopologyEdgeDeleted = "TopologyEdgeDeleted"
+)
+
+// ConnectionProfile matches Python's ConnectionProfile (optional)
+type ConnectionProfile struct {
+	Throughput float64 `json:"throughput"`
+	Latency    float64 `json:"latency"`
+	Jitter     float64 `json:"jitter"`
+}
+
+// Multiaddr matches Python's Multiaddr structure
+type Multiaddr struct {
+	Address     string `json:"address"`
+	IPv4Address string `json:"ipv4_address,omitempty"`
+	Port        int    `json:"port,omitempty"`
+}
+
+// Connection matches Python's Connection model
+type Connection struct {
+	LocalNodeID         string             `json:"local_node_id"`
+	SendBackNodeID      string             `json:"send_back_node_id"`
+	LocalMultiaddr      Multiaddr          `json:"local_multiaddr"`
+	SendBackMultiaddr   Multiaddr          `json:"send_back_multiaddr"`
+	ConnectionProfile   *ConnectionProfile `json:"connection_profile"`
+}
+
+// TopologyEdgeCreated matches Python's TopologyEdgeCreated event
+type TopologyEdgeCreated struct {
+	EventType string     `json:"event_type"`
+	EventID   string     `json:"event_id"`
+	Edge      Connection `json:"edge"`
+}
+
+// TopologyEdgeDeleted matches Python's TopologyEdgeDeleted event
+type TopologyEdgeDeleted struct {
+	EventType string     `json:"event_type"`
+	EventID   string     `json:"event_id"`
+	Edge      Connection `json:"edge"`
+}
+
+// initEventsDB initializes the events database connection
+func initEventsDB() error {
+	eventsDBMu.Lock()
+	defer eventsDBMu.Unlock()
+
+	if eventsDB != nil {
+		return nil // Already initialized
+	}
+
+	if eventsDBPath == "" {
+		return nil // No events DB configured
+	}
+
+	var err error
+	eventsDB, err = sql.Open("sqlite3", eventsDBPath)
+	if err != nil {
+		return fmt.Errorf("failed to open events database: %w", err)
+	}
+
+	// Create table if it doesn't exist (matching Python's schema)
+	createTableSQL := `
+	CREATE TABLE IF NOT EXISTS events (
+		rowid INTEGER PRIMARY KEY AUTOINCREMENT,
+		origin TEXT NOT NULL,
+		event_type TEXT NOT NULL,
+		event_id TEXT NOT NULL,
+		event_data TEXT NOT NULL,
+		created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
+	);
+	CREATE INDEX IF NOT EXISTS idx_events_origin ON events(origin);
+	CREATE INDEX IF NOT EXISTS idx_events_event_type ON events(event_type);
+	CREATE INDEX IF NOT EXISTS idx_events_created_at ON events(created_at);
+	`
+	_, err = eventsDB.Exec(createTableSQL)
+	if err != nil {
+		eventsDB.Close()
+		eventsDB = nil
+		return fmt.Errorf("failed to create events table: %w", err)
+	}
+
+	return nil
+}
+
+// writeEvent writes an event to the database
+func writeEvent(eventType string, eventData interface{}) error {
+	if eventsDB == nil {
+		if err := initEventsDB(); err != nil {
+			return err
+		}
+		if eventsDB == nil {
+			return nil // No events DB configured
+		}
+	}
+
+	// Serialize event data to JSON
+	jsonData, err := json.Marshal(eventData)
+	if err != nil {
+		return fmt.Errorf("failed to marshal event data: %w", err)
+	}
+
+	// Extract event ID from the event data
+	var eventID string
+	switch e := eventData.(type) {
+	case *TopologyEdgeCreated:
+		eventID = e.EventID
+	case *TopologyEdgeDeleted:
+		eventID = e.EventID
+	default:
+		eventID = uuid.New().String()
+	}
+
+	// Insert event into database
+	insertSQL := `INSERT INTO events (origin, event_type, event_id, event_data) VALUES (?, ?, ?, ?)`
+	_, err = eventsDB.Exec(insertSQL, GetNodeId(), eventType, eventID, string(jsonData))
+	if err != nil {
+		return fmt.Errorf("failed to insert event: %w", err)
+	}
+
+	return nil
+}
+
+// NotifeeHandler implements the libp2p network.Notifiee interface
+type NotifeeHandler struct{}
+
+// Listen is called when network starts listening on an addr
+func (n *NotifeeHandler) Listen(net network.Network, ma multiaddr.Multiaddr) {}
+
+// ListenClose is called when network stops listening on an addr
+func (n *NotifeeHandler) ListenClose(net network.Network, ma multiaddr.Multiaddr) {}
+
+// Connected is called when a connection is opened
+func (n *NotifeeHandler) Connected(net network.Network, conn network.Conn) {
+	remotePeer := conn.RemotePeer()
+	localAddr := conn.LocalMultiaddr()
+	remoteAddr := conn.RemoteMultiaddr()
+
+	// Get the actual node IDs (not peer IDs)
+	localNodeID := GetNodeId()
+	
+	// For remote node, we need to extract from peer ID or use a mapping
+	// For now, we'll use the peer ID as a placeholder
+	// TODO: Implement proper node ID mapping/discovery
+	remoteNodeID := remotePeer.String()
+
+	// Create connection event
+	event := &TopologyEdgeCreated{
+		EventType: EventTypeTopologyEdgeCreated,
+		EventID:   uuid.New().String(),
+		Edge: Connection{
+			LocalNodeID:       localNodeID,
+			SendBackNodeID:    remoteNodeID,
+			LocalMultiaddr:    parseMultiaddr(localAddr),
+			SendBackMultiaddr: parseMultiaddr(remoteAddr),
+			ConnectionProfile: nil, // TODO: Add connection profiling if needed
+		},
+	}
+
+	// Write event to database
+	if err := writeEvent(EventTypeTopologyEdgeCreated, event); err != nil {
+		log.Printf("Failed to write edge created event: %v", err)
+	} else {
+		log.Printf("Wrote edge created event: %s -> %s", localNodeID, remoteNodeID)
+	}
+}
+
+// Disconnected is called when a connection is closed
+func (n *NotifeeHandler) Disconnected(net network.Network, conn network.Conn) {
+	remotePeer := conn.RemotePeer()
+	localAddr := conn.LocalMultiaddr()
+	remoteAddr := conn.RemoteMultiaddr()
+
+	// Get the actual node IDs (not peer IDs)
+	localNodeID := GetNodeId()
+	remoteNodeID := remotePeer.String() // TODO: Implement proper node ID mapping
+
+	// Create disconnection event
+	event := &TopologyEdgeDeleted{
+		EventType: EventTypeTopologyEdgeDeleted,
+		EventID:   uuid.New().String(),
+		Edge: Connection{
+			LocalNodeID:       localNodeID,
+			SendBackNodeID:    remoteNodeID,
+			LocalMultiaddr:    parseMultiaddr(localAddr),
+			SendBackMultiaddr: parseMultiaddr(remoteAddr),
+			ConnectionProfile: nil,
+		},
+	}
+
+	// Write event to database
+	if err := writeEvent(EventTypeTopologyEdgeDeleted, event); err != nil {
+		log.Printf("Failed to write edge deleted event: %v", err)
+	} else {
+		log.Printf("Wrote edge deleted event: %s -> %s", localNodeID, remoteNodeID)
+	}
+}
+
+// OpenedStream is called when a stream is opened
+func (n *NotifeeHandler) OpenedStream(net network.Network, str network.Stream) {}
+
+// ClosedStream is called when a stream is closed
+func (n *NotifeeHandler) ClosedStream(net network.Network, str network.Stream) {}
+
+// parseMultiaddr converts a libp2p multiaddr to our Multiaddr struct
+func parseMultiaddr(ma multiaddr.Multiaddr) Multiaddr {
+	result := Multiaddr{
+		Address: ma.String(),
+	}
+	
+	// Extract IPv4 address if present
+	if ipStr, err := ma.ValueForProtocol(multiaddr.P_IP4); err == nil {
+		result.IPv4Address = ipStr
+	}
+	
+	// Extract port if present
+	if portStr, err := ma.ValueForProtocol(multiaddr.P_TCP); err == nil {
+		if port, err := strconv.Atoi(portStr); err == nil {
+			result.Port = port
+		}
+	}
+	
+	return result
+}
+
+// GetNotifee returns a singleton instance of the notifee handler
+func GetNotifee() network.Notifiee {
+	return &NotifeeHandler{}
+}
\ No newline at end of file
diff --git a/networking/forwarder/src/libp2p.go b/networking/forwarder/src/libp2p.go
index 584e2b04..d25b1811 100644
--- a/networking/forwarder/src/libp2p.go
+++ b/networking/forwarder/src/libp2p.go
@@ -6,6 +6,10 @@ import (
 	"crypto/sha256"
 	"encoding/json"
 	"log"
+	"net"
+	"os"
+	"sort"
+	"strings"
 	"sync"
 	"time"
 
@@ -15,9 +19,11 @@ import (
 	"github.com/libp2p/go-libp2p/core/host"
 	"github.com/libp2p/go-libp2p/core/network"
 	"github.com/libp2p/go-libp2p/core/peer"
+	"github.com/libp2p/go-libp2p/core/peerstore"
 	"github.com/libp2p/go-libp2p/core/pnet"
 	mdns "github.com/libp2p/go-libp2p/p2p/discovery/mdns"
 	"github.com/libp2p/go-libp2p/p2p/security/noise"
+	"github.com/multiformats/go-multiaddr"
 )
 
 var node host.Host
@@ -28,22 +34,337 @@ var mu sync.Mutex
 var refCount int
 var topicsMap = make(map[string]*pubsub.Topic)
 
+// Connection retry state tracking
+type peerConnState struct {
+	retryCount  int
+	lastAttempt time.Time
+}
+
+var peerLastAddrs = make(map[peer.ID][]multiaddr.Multiaddr)
+var addrsMu sync.Mutex
+
+var connecting = make(map[peer.ID]bool)
+var connMu sync.Mutex
+var peerRetryState = make(map[peer.ID]*peerConnState)
+var retryMu sync.Mutex
+
+const (
+	maxRetries     = 5 // Increased for more tolerance to transient failures
+	initialBackoff = 2 * time.Second
+	maxBackoff     = 33 * time.Second
+	retryResetTime = 1 * time.Minute // Reduced for faster recovery after max retries
+)
+
 type discoveryNotifee struct {
 	h host.Host
 }
 
+// sortAddrs returns a sorted copy of addresses for comparison
+func sortAddrs(addrs []multiaddr.Multiaddr) []multiaddr.Multiaddr {
+	s := make([]multiaddr.Multiaddr, len(addrs))
+	copy(s, addrs)
+	sort.Slice(s, func(i, j int) bool {
+		return s[i].String() < s[j].String()
+	})
+	return s
+}
+
+// addrsChanged checks if two address sets differ
+func addrsChanged(a, b []multiaddr.Multiaddr) bool {
+	if len(a) != len(b) {
+		return true
+	}
+	sa := sortAddrs(a)
+	sb := sortAddrs(b)
+	for i := range sa {
+		if !sa[i].Equal(sb[i]) {
+			return true
+		}
+	}
+	return false
+}
+
+// isAddressValid checks if an address should be used for connections
+func isAddressValid(addr multiaddr.Multiaddr) bool {
+	// Allow loopback for testing if env var is set
+	allowLoopback := os.Getenv("FORWARDER_ALLOW_LOOPBACK") == "true"
+
+	// Check IPv4 addresses
+	ipStr, err := addr.ValueForProtocol(multiaddr.P_IP4)
+	if err == nil && ipStr != "" {
+		ip := net.ParseIP(ipStr)
+		if ip == nil {
+			return false
+		}
+		// Filter out loopback, unspecified addresses (unless testing)
+		if !allowLoopback && (ip.IsLoopback() || ip.IsUnspecified()) {
+			return false
+		}
+		if ip.IsUnspecified() {
+			return false
+		}
+		// Filter out common VPN ranges (Tailscale uses 100.64.0.0/10)
+		if ip.To4() != nil && ip.To4()[0] == 100 && ip.To4()[1] >= 64 && ip.To4()[1] <= 127 {
+			return false
+		}
+	}
+
+	// Check IPv6 addresses
+	ipStr, err = addr.ValueForProtocol(multiaddr.P_IP6)
+	if err == nil && ipStr != "" {
+		ip := net.ParseIP(ipStr)
+		if ip == nil {
+			return false
+		}
+		// Filter out loopback, unspecified addresses (unless testing)
+		if !allowLoopback && (ip.IsLoopback() || ip.IsUnspecified()) {
+			return false
+		}
+		if ip.IsUnspecified() {
+			return false
+		}
+		// Filter out Tailscale IPv6 (fd7a:115c:a1e0::/48)
+		if strings.HasPrefix(strings.ToLower(ipStr), "fd7a:115c:a1e0:") {
+			return false
+		}
+	}
+
+	return true
+}
+
+// customInterfaceAddresses returns IPs only from interfaces that are up and running (has link)
+func customInterfaceAddresses() ([]net.IP, error) {
+	var ips []net.IP
+	ifaces, err := net.Interfaces()
+	if err != nil {
+		return nil, err
+	}
+	for _, ifi := range ifaces {
+		if ifi.Flags&net.FlagUp == 0 || ifi.Flags&net.FlagRunning == 0 {
+			continue
+		}
+		addrs, err := ifi.Addrs()
+		if err != nil {
+			return nil, err
+		}
+		for _, addr := range addrs {
+			if ipnet, ok := addr.(*net.IPNet); ok && ipnet.IP != nil {
+				ips = append(ips, ipnet.IP)
+			}
+		}
+	}
+	return ips, nil
+}
+
+// customAddrsFactory expands wildcard listen addrs to actual IPs on up+running interfaces, then filters
+func customAddrsFactory(listenAddrs []multiaddr.Multiaddr) []multiaddr.Multiaddr {
+	ips, err := customInterfaceAddresses()
+	if err != nil {
+		log.Printf("Error getting interface IPs: %v", err)
+		return nil
+	}
+
+	var advAddrs []multiaddr.Multiaddr
+	for _, la := range listenAddrs {
+		comps := multiaddr.Split(la)
+		if len(comps) == 0 {
+			continue
+		}
+		first := comps[0]
+		protos := first.Protocols()
+		if len(protos) == 0 {
+			continue
+		}
+		code := protos[0].Code
+		val, err := first.ValueForProtocol(code)
+		var isWildcard bool
+		if err == nil && ((code == multiaddr.P_IP4 && val == "0.0.0.0") || (code == multiaddr.P_IP6 && val == "::")) {
+			isWildcard = true
+		}
+
+		if isWildcard {
+			// Expand to each valid IP
+			for _, ip := range ips {
+				var pcodeStr string
+				if ip.To4() != nil {
+					pcodeStr = "4"
+				} else {
+					pcodeStr = "6"
+				}
+				newIPStr := "/ip" + pcodeStr + "/" + ip.String()
+				newIPMA, err := multiaddr.NewMultiaddr(newIPStr)
+				if err != nil {
+					continue
+				}
+				var newComps []multiaddr.Multiaddrer
+				newComps = append(newComps, newIPMA)
+				for _, c := range comps[1:] {
+					newComps = append(newComps, c.Multiaddr())
+				}
+				newa := multiaddr.Join(newComps...)
+				if isAddressValid(newa) {
+					advAddrs = append(advAddrs, newa)
+				}
+			}
+		} else if isAddressValid(la) {
+			advAddrs = append(advAddrs, la)
+		}
+	}
+	return advAddrs
+}
+
 func (n *discoveryNotifee) HandlePeerFound(pi peer.AddrInfo) {
-	if n.h.ID() >= pi.ID {
+	log.Printf("mDNS discovered peer %s with %d addresses", pi.ID, len(pi.Addrs))
+
+	// Check if already connected first
+	if n.h.Network().Connectedness(pi.ID) == network.Connected {
+		log.Printf("Already connected to peer %s", pi.ID)
 		return
 	}
-	if n.h.Network().Connectedness(pi.ID) == network.Connected {
+
+	// Clear any existing addresses for this peer to ensure we use only fresh ones from mDNS
+	ps := n.h.Peerstore()
+	ps.ClearAddrs(pi.ID)
+	log.Printf("Cleared old addresses for peer %s", pi.ID)
+
+	// During normal operation, only higher ID connects to avoid double connections
+	// But if we have retry state for this peer, both sides should attempt
+	// Also, if we have no connections at all, both sides should attempt
+	retryMu.Lock()
+	_, hasRetryState := peerRetryState[pi.ID]
+	retryMu.Unlock()
+
+	// Check if we should skip based on ID comparison
+	// Skip only if we have a higher ID, no retry state, and we already have connections
+	if n.h.ID() >= pi.ID && !hasRetryState && len(n.h.Network().Peers()) > 0 {
+		log.Printf("Skipping initial connection to peer %s (lower ID)", pi.ID)
+		return
+	}
+
+	// Filter addresses before attempting connection
+	var filteredAddrs []multiaddr.Multiaddr
+	for _, addr := range pi.Addrs {
+		if isAddressValid(addr) {
+			filteredAddrs = append(filteredAddrs, addr)
+			log.Printf("Valid address for %s: %s", pi.ID, addr)
+		} else {
+			log.Printf("Filtered out address for %s: %s", pi.ID, addr)
+		}
+	}
+
+	if len(filteredAddrs) == 0 {
+		log.Printf("No valid addresses for peer %s after filtering, skipping connection attempt", pi.ID)
 		return
 	}
-	ctx := context.Background()
+
+	// Check for address changes and reset retries if changed
+	addrsMu.Lock()
+	lastAddrs := peerLastAddrs[pi.ID]
+	addrsMu.Unlock()
+	if addrsChanged(lastAddrs, filteredAddrs) {
+		log.Printf("Detected address change for peer %s, resetting retry count", pi.ID)
+		retryMu.Lock()
+		if state, ok := peerRetryState[pi.ID]; ok {
+			state.retryCount = 0
+		}
+		retryMu.Unlock()
+		// Update last known addresses
+		addrsMu.Lock()
+		peerLastAddrs[pi.ID] = append([]multiaddr.Multiaddr(nil), filteredAddrs...) // Copy
+		addrsMu.Unlock()
+	}
+
+	pi.Addrs = filteredAddrs
+
+	// Add the filtered addresses to the peerstore with a reasonable TTL
+	ps.AddAddrs(pi.ID, filteredAddrs, peerstore.TempAddrTTL)
+
+	// Attempt connection with retry logic
+	go n.connectWithRetry(pi)
+}
+
+func (n *discoveryNotifee) connectWithRetry(pi peer.AddrInfo) {
+	// Serialize connection attempts per peer
+	connMu.Lock()
+	if connecting[pi.ID] {
+		connMu.Unlock()
+		log.Printf("Already connecting to peer %s, skipping duplicate attempt", pi.ID)
+		return
+	}
+	connecting[pi.ID] = true
+	connMu.Unlock()
+	defer func() {
+		connMu.Lock()
+		delete(connecting, pi.ID)
+		connMu.Unlock()
+	}()
+
+	retryMu.Lock()
+	state, exists := peerRetryState[pi.ID]
+	if !exists {
+		state = &peerConnState{}
+		peerRetryState[pi.ID] = state
+	}
+
+	// Check if we've exceeded max retries
+	if state.retryCount >= maxRetries {
+		// Check if enough time has passed to reset retry count
+		if time.Since(state.lastAttempt) > retryResetTime {
+			state.retryCount = 0
+			log.Printf("Reset retry count for peer %s due to time elapsed", pi.ID)
+		} else {
+			retryMu.Unlock()
+			log.Printf("Max retries reached for peer %s, skipping", pi.ID)
+			return
+		}
+	}
+
+	// Calculate backoff duration
+	backoffDuration := time.Duration(1<<uint(state.retryCount)) * initialBackoff
+	if backoffDuration > maxBackoff {
+		backoffDuration = maxBackoff
+	}
+
+	// Check if we need to wait before retrying
+	if state.retryCount > 0 && time.Since(state.lastAttempt) < backoffDuration {
+		retryMu.Unlock()
+		log.Printf("Backoff active for peer %s, skipping attempt", pi.ID)
+		return
+	}
+
+	state.lastAttempt = time.Now()
+	retryMu.Unlock()
+
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
 	if err := n.h.Connect(ctx, pi); err != nil {
-		log.Printf("Failed to connect to %s: %v", pi.ID.String(), err)
+		log.Printf("Failed to connect to %s (attempt %d/%d): %v", pi.ID, state.retryCount+1, maxRetries, err)
+
+		retryMu.Lock()
+		state.retryCount++
+		retryMu.Unlock()
+
+		// Schedule retry if we haven't exceeded max attempts
+		if state.retryCount < maxRetries {
+			time.AfterFunc(backoffDuration, func() {
+				// Check if we're still not connected before retrying
+				if n.h.Network().Connectedness(pi.ID) != network.Connected {
+					n.connectWithRetry(pi)
+				}
+			})
+		}
 	} else {
-		log.Printf("Connected to %s", pi.ID.String())
+		log.Printf("Successfully connected to %s", pi.ID)
+
+		// Reset retry state on successful connection
+		retryMu.Lock()
+		delete(peerRetryState, pi.ID)
+		retryMu.Unlock()
+		addrsMu.Lock()
+		delete(peerLastAddrs, pi.ID)
+		addrsMu.Unlock()
+		log.Printf("Cleared last addresses for disconnected peer %s", pi.ID)
 	}
 }
 
@@ -76,6 +397,9 @@ func getNode(ctx context.Context) {
 		opts = append(opts, libp2p.EnableHolePunching())   // Better NAT traversal
 		opts = append(opts, libp2p.EnableRelay())          // Allow relaying
 
+		// Custom address factory to avoid advertising down interfaces
+		opts = append(opts, libp2p.AddrsFactory(customAddrsFactory))
+
 		node, err = libp2p.New(opts...)
 		if err != nil {
 			log.Fatalf("failed to create host: %v", err)
@@ -103,9 +427,118 @@ func getNode(ctx context.Context) {
 			node.Close()
 			log.Fatalf("failed to start mdns service: %v", err)
 		}
+
+		// Register disconnect notifiee to clear stale addresses
+		node.Network().Notify(&disconnectNotifee{})
+
+		// Register event notifiee to track topology changes
+		node.Network().Notify(GetNotifee())
+
+		// Start a goroutine to periodically trigger mDNS discovery
+		go periodicMDNSDiscovery()
 	})
 }
 
+// periodicMDNSDiscovery ensures mDNS continues to work after network changes
+func periodicMDNSDiscovery() {
+	// Start with faster checks, then slow down
+	fastCheckDuration := 5 * time.Second
+	slowCheckDuration := 30 * time.Second
+	currentDuration := fastCheckDuration
+	noConnectionCount := 0
+
+	ticker := time.NewTicker(currentDuration)
+	defer ticker.Stop()
+
+	for range ticker.C {
+		if mdnsSer == nil || node == nil {
+			return
+		}
+
+		// Log current connection status
+		peers := node.Network().Peers()
+		if len(peers) == 0 {
+			noConnectionCount++
+			log.Printf("No connected peers (check #%d), mDNS service running: %v", noConnectionCount, mdnsSer != nil)
+
+			// Force mDNS to re-announce when we have no peers
+			// This helps recovery after network interface changes
+			if noConnectionCount > 1 { // Skip first check to avoid unnecessary restart
+				forceRestartMDNS()
+			}
+
+			// Keep fast checking when disconnected
+			if currentDuration != fastCheckDuration {
+				currentDuration = fastCheckDuration
+				ticker.Reset(currentDuration)
+				log.Printf("Switching to fast mDNS checks (every %v)", currentDuration)
+			}
+		} else {
+			log.Printf("Currently connected to %d peers", len(peers))
+			noConnectionCount = 0
+
+			// Switch to slow checking when connected
+			if currentDuration != slowCheckDuration {
+				currentDuration = slowCheckDuration
+				ticker.Reset(currentDuration)
+				log.Printf("Switching to slow mDNS checks (every %v)", currentDuration)
+			}
+		}
+	}
+}
+
+// forceRestartMDNS restarts the mDNS service to force re-announcement
+func forceRestartMDNS() {
+	mu.Lock()
+	defer mu.Unlock()
+
+	if mdnsSer != nil && node != nil {
+		log.Printf("Force restarting mDNS service for re-announcement")
+		oldMdns := mdnsSer
+		rendezvous := "forwarder_network"
+		notifee := &discoveryNotifee{h: node}
+		newMdns := mdns.NewMdnsService(node, rendezvous, notifee)
+
+		if err := newMdns.Start(); err != nil {
+			log.Printf("Failed to restart mDNS service: %v", err)
+		} else {
+			oldMdns.Close()
+			mdnsSer = newMdns
+			log.Printf("Successfully restarted mDNS service")
+		}
+	}
+}
+
+// disconnectNotifee clears stale peer addresses on disconnect
+type disconnectNotifee struct{}
+
+func (d *disconnectNotifee) Connected(network.Network, network.Conn) {}
+func (d *disconnectNotifee) Disconnected(n network.Network, c network.Conn) {
+	p := c.RemotePeer()
+	ps := n.Peerstore()
+
+	// Clear all addresses from peerstore to force fresh discovery on reconnect
+	ps.ClearAddrs(p)
+
+	// Also clear retry state for this peer
+	retryMu.Lock()
+	delete(peerRetryState, p)
+	retryMu.Unlock()
+
+	log.Printf("Cleared stale addresses and retry state for disconnected peer %s", p)
+
+	// Try to restart mDNS discovery after a short delay to handle network interface changes
+	go func() {
+		time.Sleep(2 * time.Second)
+		log.Printf("Triggering mDNS re-discovery after disconnect")
+		forceRestartMDNS()
+	}()
+}
+func (d *disconnectNotifee) OpenedStream(network.Network, network.Stream)     {}
+func (d *disconnectNotifee) ClosedStream(network.Network, network.Stream)     {}
+func (d *disconnectNotifee) Listen(network.Network, multiaddr.Multiaddr)      {}
+func (d *disconnectNotifee) ListenClose(network.Network, multiaddr.Multiaddr) {}
+
 type libP2PConnector struct {
 	topic     string
 	sub       *pubsub.Subscription
diff --git a/pyproject.toml b/pyproject.toml
index 7d8aad79..2404533f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -113,4 +113,8 @@ extend-select = ["I", "N", "B", "A", "PIE", "SIM"]
 
 [tool.pytest.ini_options]
 pythonpath = "."
-asyncio_mode = "auto"
\ No newline at end of file
+asyncio_mode = "auto"
+markers = [
+    "slow: marks tests as slow (deselected by default)"
+]
+addopts = "-m 'not slow'"
diff --git a/run.sh b/run.sh
index f63eea07..c32b9345 100755
--- a/run.sh
+++ b/run.sh
@@ -40,7 +40,7 @@ fi
 
 # Second command (master) - changes based on replica flag
 if [ "$REPLICA" = true ]; then
-  osascript -e "tell app \"Terminal\" to do script \"cd '$DIR'; nix develop -c bash -c 'export EXO_RUN_AS_REPLICA=1 EXO_HOME=.exo_replica API_PORT=8001; uv run -m master.main'\""
+  osascript -e "tell app \"Terminal\" to do script \"cd '$DIR'; nix develop -c bash -c 'export RUST_LOG=true EXO_RUN_AS_REPLICA=1 EXO_HOME=.exo_replica API_PORT=8001; uv run -m master.main'\""
 else
-  osascript -e "tell app \"Terminal\" to do script \"cd '$DIR'; nix develop -c uv run -m master.main\""
+  osascript -e "tell app \"Terminal\" to do script \"cd '$DIR'; nix develop -c bash -c 'export RUST_LOG=true; uv run -m master.main'\""
 fi
\ No newline at end of file
diff --git a/rust/discovery/src/behaviour.rs b/rust/discovery/src/behaviour.rs
index 15efe265..382fe241 100644
--- a/rust/discovery/src/behaviour.rs
+++ b/rust/discovery/src/behaviour.rs
@@ -200,7 +200,7 @@ fn mdns_behaviour(keypair: &identity::Keypair) -> AnyResult<mdns::tokio::Behavio
 
     // mDNS config => enable IPv6
     let mdns_config = Config {
-        // enable_ipv6: true, // TODO: for some reason, TCP+mDNS don't work well with ipv6?? figure out how to make work
+        enable_ipv6: true,
         ..Default::default()
     };
 
diff --git a/rust/discovery/src/lib.rs b/rust/discovery/src/lib.rs
index bcc1075a..b1a5abdc 100644
--- a/rust/discovery/src/lib.rs
+++ b/rust/discovery/src/lib.rs
@@ -17,6 +17,7 @@
 use crate::behaviour::{discovery_behaviour, DiscoveryBehaviour};
 use crate::transport::discovery_transport;
 use libp2p::{identity, Swarm, SwarmBuilder};
+use std::net::IpAddr;
 
 pub mod behaviour;
 pub mod transport;
@@ -49,11 +50,18 @@ pub fn discovery_swarm(keypair: identity::Keypair) -> alias::AnyResult<Swarm<Dis
         .with_behaviour(discovery_behaviour)?
         .build();
 
-    // Listen on all interfaces and whatever port the OS assigns
-    // swarm.listen_on("/ip4/0.0.0.0/udp/0/quic-v1".parse()?)?; // TODO: make this
-    let listen_addr = "/ip4/0.0.0.0/tcp/0".parse()?;
-    log::info!("RUST: Attempting to listen on: {}", listen_addr);
-    swarm.listen_on(listen_addr)?;
+    // Listen on IPv4
+    let listen_addr_ipv4 = "/ip4/0.0.0.0/tcp/0".parse()?;
+    log::info!("RUST: Attempting to listen on: {}", listen_addr_ipv4);
+    swarm.listen_on(listen_addr_ipv4)?;
+
+    // Listen on IPv6 - try but don't fail if not available
+    let listen_addr_ipv6 = "/ip6/::/tcp/0".parse()?;
+    log::info!("RUST: Attempting to listen on: {}", listen_addr_ipv6);
+    match swarm.listen_on(listen_addr_ipv6) {
+        Ok(_) => log::info!("RUST: Successfully listening on IPv6"),
+        Err(e) => log::warn!("RUST: Failed to listen on IPv6 (this is okay if IPv6 is not available): {:?}", e),
+    }
 
     Ok(swarm)
 }
diff --git a/rust/discovery/src/transport.rs b/rust/discovery/src/transport.rs
index ee7213d8..189d65c5 100644
--- a/rust/discovery/src/transport.rs
+++ b/rust/discovery/src/transport.rs
@@ -33,7 +33,8 @@ fn tcp_transport(
     };
 
     // `TCP_NODELAY` enabled => avoid latency
-    let tcp_config = Config::default().nodelay(true);
+    let tcp_config = Config::default()
+        .nodelay(true);
 
     // V1 + lazy flushing => 0-RTT negotiation
     let upgrade_version = Version::V1Lazy;
diff --git a/rust/exo_pyo3_bindings/src/discovery.rs b/rust/exo_pyo3_bindings/src/discovery.rs
index 3ba8bbc6..37772807 100644
--- a/rust/exo_pyo3_bindings/src/discovery.rs
+++ b/rust/exo_pyo3_bindings/src/discovery.rs
@@ -18,12 +18,14 @@ use libp2p::multiaddr::multiaddr;
 use libp2p::swarm::dial_opts::DialOpts;
 use libp2p::swarm::{ConnectionId, SwarmEvent, ToSwarm};
 use libp2p::{Multiaddr, PeerId, Swarm, gossipsub, mdns};
+use std::net::IpAddr;
 use pyo3::prelude::{PyModule, PyModuleMethods as _};
 use pyo3::{Bound, Py, PyObject, PyResult, PyTraverseError, PyVisit, Python, pymethods};
 use pyo3_stub_gen::derive::{gen_stub_pyclass, gen_stub_pymethods};
 use std::convert::identity;
 use std::error::Error;
 use tokio::sync::mpsc;
+use tokio::time::{interval, Duration};
 
 struct ConnectionUpdate {
     /// Identity of the peer that we have connected to.
@@ -77,6 +79,46 @@ enum IncomingDiscoveryMessage {
     AddDisconnectedCallback(Box<dyn alias::SendFn<(ConnectionUpdate,), ()>>),
 }
 
+/// Check if a multiaddr is valid for connection
+fn is_address_valid(addr: &Multiaddr) -> bool {
+    use libp2p::multiaddr::Protocol;
+    
+    for component in addr.iter() {
+        match component {
+            Protocol::Ip4(ip) => {
+                let ip_addr = IpAddr::V4(ip);
+                // Filter out loopback and unspecified addresses
+                if ip_addr.is_loopback() || ip_addr.is_unspecified() {
+                    return false;
+                }
+                // Filter out Tailscale ranges (100.64.0.0/10)
+                if let IpAddr::V4(ipv4) = ip_addr {
+                    let octets = ipv4.octets();
+                    if octets[0] == 100 && octets[1] >= 64 && octets[1] <= 127 {
+                        return false;
+                    }
+                }
+            }
+            Protocol::Ip6(ip) => {
+                let ip_addr = IpAddr::V6(ip);
+                // Filter out loopback and unspecified addresses
+                if ip_addr.is_loopback() || ip_addr.is_unspecified() {
+                    return false;
+                }
+                // Filter out Tailscale IPv6 (fd7a:115c:a1e0::/48)
+                if let IpAddr::V6(ipv6) = ip_addr {
+                    let segments = ipv6.segments();
+                    if segments[0] == 0xfd7a && segments[1] == 0x115c && segments[2] == 0xa1e0 {
+                        return false;
+                    }
+                }
+            }
+            _ => {}
+        }
+    }
+    true
+}
+
 #[allow(clippy::enum_glob_use)]
 async fn discovery_task(
     mut receiver: mpsc::Receiver<IncomingDiscoveryMessage>,
@@ -93,9 +135,60 @@ async fn discovery_task(
     // create callbacks list
     let mut connected_callbacks: Vec<Box<dyn alias::SendFn<(ConnectionUpdate,), ()>>> = vec![];
     let mut disconnected_callbacks: Vec<Box<dyn alias::SendFn<(ConnectionUpdate,), ()>>> = vec![];
+    
+    // Create periodic health check timer with adaptive interval
+    let fast_check_duration = Duration::from_secs(5);
+    let slow_check_duration = Duration::from_secs(30);
+    let mut health_check_interval = interval(fast_check_duration);
+    let mut no_connection_count = 0;
 
     loop {
         tokio::select! {
+            _ = health_check_interval.tick() => {
+                // Check connection health periodically
+                let connected_peers = swarm.connected_peers().count();
+                if connected_peers == 0 {
+                    no_connection_count += 1;
+                    log::info!("RUST: No connected peers (check #{no_connection_count})");
+                    
+                    // Keep fast checking when disconnected
+                    if health_check_interval.period() != fast_check_duration {
+                        health_check_interval = interval(fast_check_duration);
+                        log::info!("RUST: Switching to fast health checks (every {:?})", fast_check_duration);
+                    }
+                    
+                    // Force mDNS restart after multiple failed checks
+                    if no_connection_count > 1 { // Trigger faster, after 2 checks
+                        log::info!("RUST: Attempting to restart mDNS discovery");
+                        // Note: In rust-libp2p, we can't easily restart mDNS like in Go,
+                        // but we can force a re-announce by changing listening addresses
+                        // This is a workaround to trigger mDNS to re-announce
+                        
+                        // Try listening on a new ephemeral port to force re-announcement
+                        match swarm.listen_on("/ip4/0.0.0.0/tcp/0".parse().unwrap()) {
+                            Ok(_) => log::info!("RUST: Added new listener to force mDNS re-announcement"),
+                            Err(e) => log::error!("RUST: Failed to add new listener: {e:?}"),
+                        }
+                        
+                        // Also try IPv6
+                        match swarm.listen_on("/ip6/::/tcp/0".parse().unwrap()) {
+                            Ok(_) => log::info!("RUST: Added IPv6 listener to force mDNS re-announcement"),
+                            Err(e) => log::error!("RUST: Failed to add IPv6 listener: {e:?}"),
+                        }
+                    }
+                } else {
+                    if no_connection_count > 0 {
+                        log::info!("RUST: Connection restored, currently connected to {connected_peers} peers");
+                    }
+                    no_connection_count = 0;
+                    
+                    // Switch to slow checking when connected
+                    if health_check_interval.period() != slow_check_duration {
+                        health_check_interval = interval(slow_check_duration);
+                        log::info!("RUST: Switching to slow health checks (every {:?})", slow_check_duration);
+                    }
+                }
+            }
             message = receiver.recv() => {
                 // handle closed channel
                 let Some(message) = message else {
@@ -120,6 +213,13 @@ async fn discovery_task(
                     Behaviour(Mdns(Discovered(list))) => {
                         for (peer_id, multiaddr) in list {
                             log::info!("RUST: mDNS discovered a new peer: {peer_id} on {multiaddr}");
+                            
+                            // Filter out invalid addresses
+                            if !is_address_valid(&multiaddr) {
+                                log::info!("RUST: Filtered out invalid address: {multiaddr}");
+                                continue;
+                            }
+                            
                             let local_peer_id = *swarm.local_peer_id();
                             // To avoid simultaneous dial races, only the lexicographically larger peer_id dials.
                             if peer_id > local_peer_id {
@@ -234,12 +334,36 @@ async fn discovery_task(
                                 send_back_addr: send_back_addr.clone(),
                             });
                         }
+                        
+                        // If this was the last connection to the peer, try to force mDNS re-discovery
+                        if num_established == 0 {
+                            log::info!("RUST: Last connection to peer {peer_id} closed, triggering mDNS re-discovery");
+                            // Remove from gossipsub to ensure clean state
+                            swarm.behaviour_mut().gossipsub.remove_explicit_peer(&peer_id);
+                            
+                            // Force a listen address change to trigger mDNS re-announcement
+                            tokio::spawn(async move {
+                                tokio::time::sleep(Duration::from_secs(2)).await;
+                                log::info!("RUST: Delayed mDNS trigger after disconnect");
+                            });
+                        }
                     }
                     NewListenAddr { address, .. } => {
                         log::info!("RUST: Local node is listening on {address}");
                         let local_peer = swarm.local_peer_id();
                         log::info!("RUST: Local peer_id: {local_peer}");
                     }
+                    OutgoingConnectionError { peer_id, error, .. } => {
+                        log::error!("RUST: Outgoing connection error to peer {peer_id:?}: {error:?}");
+                        // Connection failed, might be due to network change
+                        if let Some(peer) = peer_id {
+                            // Remove from gossipsub to allow fresh connection attempts
+                            swarm.behaviour_mut().gossipsub.remove_explicit_peer(&peer);
+                        }
+                    }
+                    IncomingConnectionError { send_back_addr, error, .. } => {
+                        log::error!("RUST: Incoming connection error from {send_back_addr}: {error:?}");
+                    }
                     e => {
                         log::debug!("RUST: Other event {e:?}");
                     }
diff --git a/shared/apply/apply.py b/shared/apply/apply.py
index 18914590..abb0b05b 100644
--- a/shared/apply/apply.py
+++ b/shared/apply/apply.py
@@ -1,14 +1,13 @@
+from __future__ import annotations
+
 import copy
 from functools import singledispatch
-from typing import Mapping, TypeVar
+from typing import Mapping
 
-# from shared.topology import Topology
 from shared.types.common import NodeId
 from shared.types.events import (
-    ChunkGenerated,
     Event,
     EventFromEventLog,
-    Heartbeat,
     InstanceActivated,
     InstanceCreated,
     InstanceDeactivated,
@@ -35,20 +34,25 @@ from shared.types.worker.common import NodeStatus, RunnerId
 from shared.types.worker.instances import Instance, InstanceId, InstanceStatus
 from shared.types.worker.runners import RunnerStatus
 
-S = TypeVar("S", bound=State)
 
 @singledispatch
 def event_apply(event: Event, state: State) -> State:
+    """Apply an event to *state*.
+
+    Events decorated with ``@no_op_event`` set ``__no_apply__ = True`` on the
+    class.  Such events are considered *no-ops* and therefore leave the state
+    unchanged without requiring a dedicated handler in this dispatch table.
+    """
+
+    if getattr(event, "__no_apply__", False):
+        return state
+
     raise RuntimeError(f"no handler registered for event type {type(event).__name__}")
 
 def apply(state: State, event: EventFromEventLog[Event]) -> State:
     new_state: State = event_apply(event.event, state)
     return new_state.model_copy(update={"last_event_applied_idx": event.idx_in_log})
 
-@event_apply.register(Heartbeat)
-def apply_heartbeat(event: Heartbeat, state: State) -> State:
-    return state
-
 @event_apply.register(TaskCreated)
 def apply_task_created(event: TaskCreated, state: State) -> State:
     new_tasks: Mapping[TaskId, Task] = {**state.tasks, event.task_id: event.task}
@@ -148,10 +152,6 @@ def apply_worker_status_updated(event: WorkerStatusUpdated, state: State) -> Sta
     new_node_status: Mapping[NodeId, NodeStatus] = {**state.node_status, event.node_id: event.node_state}
     return state.model_copy(update={"node_status": new_node_status})
 
-@event_apply.register(ChunkGenerated)
-def apply_chunk_generated(event: ChunkGenerated, state: State) -> State:
-    return state
-
 @event_apply.register(TopologyNodeCreated)
 def apply_topology_node_created(event: TopologyNodeCreated, state: State) -> State:
     topology = copy.copy(state.topology)
@@ -164,6 +164,13 @@ def apply_topology_node_created(event: TopologyNodeCreated, state: State) -> Sta
 def apply_topology_edge_created(event: TopologyEdgeCreated, state: State) -> State:
     topology = copy.copy(state.topology)
     topology.add_connection(event.edge)
+    opposite_edge = Connection(
+        local_node_id=event.edge.send_back_node_id,
+        send_back_node_id=event.edge.local_node_id,
+        local_multiaddr=event.edge.send_back_multiaddr,
+        send_back_multiaddr=event.edge.local_multiaddr
+    )
+    topology.add_connection(opposite_edge)
     return state.model_copy(update={"topology": topology})
 
 @event_apply.register(TopologyEdgeReplacedAtomically)
diff --git a/shared/db/sqlite/connector.py b/shared/db/sqlite/connector.py
index d03dbd61..df328367 100644
--- a/shared/db/sqlite/connector.py
+++ b/shared/db/sqlite/connector.py
@@ -1,6 +1,7 @@
 import asyncio
 import contextlib
 import json
+import random
 from asyncio import Queue, Task
 from collections.abc import Sequence
 from logging import Logger, getLogger
@@ -8,8 +9,8 @@ from pathlib import Path
 from typing import Any, cast
 
 from sqlalchemy import text
-from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine
-from sqlmodel import SQLModel
+from sqlalchemy.exc import OperationalError
+from sqlalchemy.ext.asyncio import AsyncConnection, AsyncSession, create_async_engine
 
 from shared.types.events import Event, EventParser, NodeId
 from shared.types.events._events import Heartbeat
@@ -81,7 +82,8 @@ class AsyncSQLiteEventStorage:
     
     async def get_events_since(
         self, 
-        last_idx: int
+        last_idx: int,
+        ignore_no_op_events: bool = False
     ) -> Sequence[EventFromEventLog[Event]]:
         """Retrieve events after a specific index."""
         if self._closed:
@@ -107,8 +109,11 @@ class AsyncSQLiteEventStorage:
                 event_data: dict[str, Any] = cast(dict[str, Any], json.loads(raw_event_data))
             else:
                 event_data = cast(dict[str, Any], raw_event_data)
+            event = EventParser.validate_python(event_data)
+            if ignore_no_op_events and event.__no_apply__:
+                continue
             events.append(EventFromEventLog(
-                event=EventParser.validate_python(event_data),
+                event=event,
                 origin=NodeId(origin),
                 idx_in_log=rowid  # rowid becomes idx_in_log
             ))
@@ -169,17 +174,65 @@ class AsyncSQLiteEventStorage:
             echo=False,
             connect_args={
                 "check_same_thread": False,
-            }
+                "timeout": 30.0,  # Connection timeout in seconds
+            },
+            pool_pre_ping=True,  # Test connections before using them
+            pool_size=5,
+            max_overflow=10
         )
         
-        # Create tables using SQLModel
+        # Create tables with proper race condition handling
         async with self._engine.begin() as conn:
-            await conn.run_sync(SQLModel.metadata.create_all)
+            # First check if the table exists using SQLite's master table
+            result = await conn.execute(
+                text("SELECT name FROM sqlite_master WHERE type='table' AND name='events'")
+            )
+            table_exists = result.fetchone() is not None
+            
+            if not table_exists:
+                try:
+                    # Use CREATE TABLE IF NOT EXISTS as a more atomic operation
+                    # This avoids race conditions between check and create
+                    await conn.execute(text("""
+                        CREATE TABLE IF NOT EXISTS events (
+                            rowid INTEGER PRIMARY KEY AUTOINCREMENT,
+                            origin TEXT NOT NULL,
+                            event_type TEXT NOT NULL,
+                            event_id TEXT NOT NULL,
+                            event_data TEXT NOT NULL,
+                            created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
+                        )
+                    """))
+                    
+                    # Create indexes if they don't exist
+                    await conn.execute(text("CREATE INDEX IF NOT EXISTS idx_events_origin ON events(origin)"))
+                    await conn.execute(text("CREATE INDEX IF NOT EXISTS idx_events_event_type ON events(event_type)"))
+                    await conn.execute(text("CREATE INDEX IF NOT EXISTS idx_events_event_id ON events(event_id)"))
+                    await conn.execute(text("CREATE INDEX IF NOT EXISTS idx_events_created_at ON events(created_at)"))
+                    await conn.execute(text("CREATE INDEX IF NOT EXISTS idx_events_origin_created ON events(origin, created_at)"))
+                    
+                    self._logger.info("Events table and indexes created successfully")
+                except OperationalError as e:
+                    # Even with IF NOT EXISTS, log any unexpected errors
+                    self._logger.error(f"Error creating table: {e}")
+                    # Re-check if table exists now
+                    result = await conn.execute(
+                        text("SELECT name FROM sqlite_master WHERE type='table' AND name='events'")
+                    )
+                    if result.fetchone() is None:
+                        raise RuntimeError(f"Failed to create events table: {e}") from e
+                    else:
+                        self._logger.info("Events table exists (likely created by another process)")
+            else:
+                self._logger.debug("Events table already exists")
             
-            # Enable WAL mode and other optimizations
-            await conn.execute(text("PRAGMA journal_mode=WAL"))
-            await conn.execute(text("PRAGMA synchronous=NORMAL"))
-            await conn.execute(text("PRAGMA cache_size=10000"))
+            # Enable WAL mode and other optimizations with retry logic
+            await self._execute_pragma_with_retry(conn, [
+                "PRAGMA journal_mode=WAL",
+                "PRAGMA synchronous=NORMAL",
+                "PRAGMA cache_size=10000",
+                "PRAGMA busy_timeout=30000"  # 30 seconds busy timeout
+            ])
     
     async def _batch_writer(self) -> None:
         """Background task that drains the queue and commits batches.
@@ -250,6 +303,69 @@ class AsyncSQLiteEventStorage:
             if len([ev for ev in batch if not isinstance(ev[0], Heartbeat)]) > 0:
                 self._logger.debug(f"Committed batch of {len(batch)} events")
         
+        except OperationalError as e:
+            if "database is locked" in str(e):
+                self._logger.warning(f"Database locked during batch commit, will retry: {e}")
+                # Retry with exponential backoff
+                await self._commit_batch_with_retry(batch)
+            else:
+                self._logger.error(f"Failed to commit batch: {e}")
+                raise
         except Exception as e:
             self._logger.error(f"Failed to commit batch: {e}")
             raise
+    
+    async def _execute_pragma_with_retry(self, conn: AsyncConnection, pragmas: list[str], max_retries: int = 5) -> None:
+        """Execute PRAGMA statements with retry logic for database lock errors."""
+        for pragma in pragmas:
+            retry_count = 0
+            base_delay: float = 0.1  # 100ms
+            
+            while retry_count < max_retries:
+                try:
+                    await conn.execute(text(pragma))
+                    break
+                except OperationalError as e:
+                    if "database is locked" in str(e) and retry_count < max_retries - 1:
+                        delay = cast(float, base_delay * (2 ** retry_count) + random.uniform(0, 0.1))
+                        self._logger.warning(f"Database locked on '{pragma}', retry {retry_count + 1}/{max_retries} after {delay:.2f}s")
+                        await asyncio.sleep(delay)
+                        retry_count += 1
+                    else:
+                        self._logger.error(f"Failed to execute '{pragma}' after {retry_count + 1} attempts: {e}")
+                        raise
+    
+    async def _commit_batch_with_retry(self, batch: list[tuple[Event, NodeId]], max_retries: int = 5) -> None:
+        """Commit a batch with retry logic for database lock errors."""
+        retry_count = 0
+        base_delay: float = 0.1  # 100ms
+        
+        while retry_count < max_retries:
+            try:
+                assert self._engine is not None
+                
+                async with AsyncSession(self._engine) as session:
+                    for event, origin in batch:
+                        stored_event = StoredEvent(
+                            origin=origin,
+                            event_type=event.event_type,
+                            event_id=str(event.event_id),
+                            event_data=event.model_dump(mode='json')
+                        )
+                        session.add(stored_event)
+                    
+                    await session.commit()
+                
+                if len([ev for ev in batch if not isinstance(ev[0], Heartbeat)]) > 0:
+                    self._logger.debug(f"Committed batch of {len(batch)} events after {retry_count} retries")
+                return
+                
+            except OperationalError as e:
+                if "database is locked" in str(e) and retry_count < max_retries - 1:
+                    delay = cast(float, base_delay * (2 ** retry_count) + random.uniform(0, 0.1))
+                    self._logger.warning(f"Database locked on batch commit, retry {retry_count + 1}/{max_retries} after {delay:.2f}s")
+                    await asyncio.sleep(delay)
+                    retry_count += 1
+                else:
+                    self._logger.error(f"Failed to commit batch after {retry_count + 1} attempts: {e}")
+                    raise
diff --git a/shared/db/sqlite/event_log_manager.py b/shared/db/sqlite/event_log_manager.py
index 266b24ff..a35b0d24 100644
--- a/shared/db/sqlite/event_log_manager.py
+++ b/shared/db/sqlite/event_log_manager.py
@@ -1,5 +1,8 @@
+import asyncio
 from logging import Logger
-from typing import Dict
+from typing import Dict, Optional, cast
+
+from sqlalchemy.exc import OperationalError
 
 from shared.constants import EXO_HOME
 from shared.db.sqlite.config import EventLogConfig, EventLogType
@@ -25,11 +28,34 @@ class EventLogManager:
         EXO_HOME.mkdir(parents=True, exist_ok=True)
     
     # TODO: This seems like it's a pattern to avoid an async __init__ function. But as we know, there's a better pattern for this - using a create() function, like in runner_supervisor.
-    async def initialize(self) -> None:
-        """Initialize both connectors - call this during startup"""
+    async def initialize(self, max_retries: int = 3) -> None:
+        """Initialize both connectors with retry logic - call this during startup"""
         # Both master and worker need both connectors
-        await self.get_connector(EventLogType.WORKER_EVENTS)
-        await self.get_connector(EventLogType.GLOBAL_EVENTS)
+        for log_type in [EventLogType.WORKER_EVENTS, EventLogType.GLOBAL_EVENTS]:
+            retry_count: int = 0
+            last_error: Optional[Exception] = None
+            
+            while retry_count < max_retries:
+                try:
+                    await self.get_connector(log_type)
+                    break
+                except OperationalError as e:
+                    last_error = e
+                    if "database is locked" in str(e) and retry_count < max_retries - 1:
+                        retry_count += 1
+                        delay = cast(float, 0.5 * (2 ** retry_count))
+                        self._logger.warning(f"Database locked while initializing {log_type.value}, retry {retry_count}/{max_retries} after {delay}s")
+                        await asyncio.sleep(delay)
+                    else:
+                        self._logger.error(f"Failed to initialize {log_type.value} after {retry_count + 1} attempts: {e}")
+                        raise RuntimeError(f"Could not initialize {log_type.value} database after {retry_count + 1} attempts") from e
+                except Exception as e:
+                    self._logger.error(f"Unexpected error initializing {log_type.value}: {e}")
+                    raise
+            
+            if retry_count >= max_retries and last_error:
+                raise RuntimeError(f"Could not initialize {log_type.value} database after {max_retries} attempts") from last_error
+        
         self._logger.info("Initialized all event log connectors")
     
     async def get_connector(self, log_type: EventLogType) -> AsyncSQLiteEventStorage:
@@ -37,20 +63,24 @@ class EventLogManager:
         if log_type not in self._connectors:
             db_path = self._config.get_db_path(log_type)
             
-            connector = AsyncSQLiteEventStorage(
-                db_path=db_path,
-                batch_size=self._config.batch_size,
-                batch_timeout_ms=self._config.batch_timeout_ms,
-                debounce_ms=self._config.debounce_ms,
-                max_age_ms=self._config.max_age_ms,
-                logger=self._logger
-            )
-            
-            # Start the connector (creates tables if needed)
-            await connector.start()
-            
-            self._connectors[log_type] = connector
-            self._logger.info(f"Initialized {log_type.value} connector at {db_path}")
+            try:
+                connector = AsyncSQLiteEventStorage(
+                    db_path=db_path,
+                    batch_size=self._config.batch_size,
+                    batch_timeout_ms=self._config.batch_timeout_ms,
+                    debounce_ms=self._config.debounce_ms,
+                    max_age_ms=self._config.max_age_ms,
+                    logger=self._logger
+                )
+                
+                # Start the connector (creates tables if needed)
+                await connector.start()
+                
+                self._connectors[log_type] = connector
+                self._logger.info(f"Initialized {log_type.value} connector at {db_path}")
+            except Exception as e:
+                self._logger.error(f"Failed to create {log_type.value} connector: {e}")
+                raise
         
         return self._connectors[log_type]
     
diff --git a/shared/topology.py b/shared/topology.py
index 9658d483..e8b47520 100644
--- a/shared/topology.py
+++ b/shared/topology.py
@@ -86,8 +86,11 @@ class Topology(TopologyProto):
             yield connection
 
     def get_node_profile(self, node_id: NodeId) -> NodePerformanceProfile | None:
-        rx_idx = self._node_id_to_rx_id_map[node_id]
-        return self._graph.get_node_data(rx_idx).node_profile
+        try:
+            rx_idx = self._node_id_to_rx_id_map[node_id]
+            return self._graph.get_node_data(rx_idx).node_profile
+        except KeyError:
+            return None
     
     def get_node_multiaddr(self, node_id: NodeId) -> Multiaddr:
         for connection in self.list_connections():
@@ -106,8 +109,11 @@ class Topology(TopologyProto):
         self._graph.update_edge_by_index(rx_idx, connection)
 
     def get_connection_profile(self, connection: Connection) -> ConnectionProfile | None:
-        rx_idx = self._edge_id_to_rx_id_map[connection]
-        return self._graph.get_edge_data_by_index(rx_idx).connection_profile
+        try:
+            rx_idx = self._edge_id_to_rx_id_map[connection]
+            return self._graph.get_edge_data_by_index(rx_idx).connection_profile
+        except KeyError:
+            return None
 
     def remove_node(self, node_id: NodeId) -> None:
         rx_idx = self._node_id_to_rx_id_map[node_id]
@@ -118,27 +124,22 @@ class Topology(TopologyProto):
 
     def remove_connection(self, connection: Connection) -> None:
         rx_idx = self._edge_id_to_rx_id_map[connection]
-        print(f"removing connection: {connection}, is bridge: {self._is_bridge(connection)}")
         if self._is_bridge(connection):
             # Determine the reference node from which reachability is calculated.
             # Prefer a master node if the topology knows one; otherwise fall back to
             # the local end of the connection being removed.
             reference_node_id: NodeId = self.master_node_id if self.master_node_id is not None else connection.local_node_id
             orphan_node_ids = self._get_orphan_node_ids(reference_node_id, connection)
-            print(f"orphan node ids: {orphan_node_ids}")
             for orphan_node_id in orphan_node_ids:
                 orphan_node_rx_id = self._node_id_to_rx_id_map[orphan_node_id]
-                print(f"removing orphan node: {orphan_node_id}, rx_id: {orphan_node_rx_id}")
                 self._graph.remove_node(orphan_node_rx_id)
                 del self._node_id_to_rx_id_map[orphan_node_id]
+                del self._rx_id_to_node_id_map[orphan_node_rx_id]
             
         self._graph.remove_edge_from_index(rx_idx)
         del self._edge_id_to_rx_id_map[connection]
         if rx_idx in self._rx_id_to_node_id_map:
             del self._rx_id_to_node_id_map[rx_idx]
-        
-        
-        print(f"topology after edge removal: {self.to_snapshot()}")
 
     def get_cycles(self) -> list[list[Node]]:
         cycle_idxs = rx.simple_cycles(self._graph)
@@ -161,14 +162,12 @@ class Topology(TopologyProto):
         return topology
 
     def _is_bridge(self, connection: Connection) -> bool:
-        edge_idx = self._edge_id_to_rx_id_map[connection]
-        graph_copy: rx.PyDiGraph[Node, Connection] = self._graph.copy()
-        components_before = rx.strongly_connected_components(graph_copy)
-
-        graph_copy.remove_edge_from_index(edge_idx)
-        components_after = rx.strongly_connected_components(graph_copy)
-
-        return components_after > components_before
+        """Check if removing this connection will orphan any nodes from the master."""
+        if self.master_node_id is None:
+            return False
+        
+        orphan_node_ids = self._get_orphan_node_ids(self.master_node_id, connection)
+        return len(orphan_node_ids) > 0
 
     def _get_orphan_node_ids(self, master_node_id: NodeId, connection: Connection) -> list[NodeId]:
         """Return node_ids that become unreachable from `master_node_id` once `connection` is removed.
diff --git a/shared/types/events/_events.py b/shared/types/events/_events.py
index cb092909..b74d185a 100644
--- a/shared/types/events/_events.py
+++ b/shared/types/events/_events.py
@@ -3,7 +3,9 @@ from enum import Enum
 from typing import (
     TYPE_CHECKING,
     Annotated,
+    Any,
     Literal,
+    TypeVar,
     Union,
     get_args,
     get_origin,
@@ -90,6 +92,7 @@ class _BaseEvent[T: _EventType](BaseModel):
 
     event_type: T
     event_id: EventId = EventId()
+    __no_apply__: bool = False
 
     def check_event_was_sent_by_correct_node(self, origin_id: NodeId) -> bool:
         """Check if the event was sent by the correct node.
@@ -99,6 +102,20 @@ class _BaseEvent[T: _EventType](BaseModel):
         """
         return True
 
+_E = TypeVar("_E", bound=_BaseEvent[Any])
+
+def no_op_event(cls: type[_E]) -> type[_E]:
+    """Decorator to mark an event class as a *no-op*.
+
+    Events marked as no-ops do not require an `event_apply` registration – the
+    apply layer will simply return the current state unchanged.  This reduces
+    boilerplate and keeps console output quieter for high-frequency events
+    such as *Heartbeat* or streaming *ChunkGenerated* messages.
+    """
+
+    cls.__no_apply__ = True  # Used by the apply layer to identify no-op events
+    return cls
+@no_op_event
 class Heartbeat(_BaseEvent[_EventType.Heartbeat]):
     event_type: Literal[_EventType.Heartbeat] = _EventType.Heartbeat
     node_id: NodeId
@@ -152,6 +169,7 @@ class InstanceReplacedAtomically(_BaseEvent[_EventType.InstanceReplacedAtomicall
     instance_to_replace: InstanceId
     new_instance_id: InstanceId
 
+# TODO: RunnerCreated
 
 class RunnerStatusUpdated(_BaseEvent[_EventType.RunnerStatusUpdated]):
     event_type: Literal[_EventType.RunnerStatusUpdated] = _EventType.RunnerStatusUpdated
@@ -176,6 +194,7 @@ class WorkerStatusUpdated(_BaseEvent[_EventType.WorkerStatusUpdated]):
     node_state: NodeStatus
 
 
+@no_op_event
 class ChunkGenerated(_BaseEvent[_EventType.ChunkGenerated]):
     event_type: Literal[_EventType.ChunkGenerated] = _EventType.ChunkGenerated
     command_id: CommandId
diff --git a/shared/types/worker/common.py b/shared/types/worker/common.py
index c3b9aeea..754b0af4 100644
--- a/shared/types/worker/common.py
+++ b/shared/types/worker/common.py
@@ -14,4 +14,3 @@ class RunnerId(ID):
 class NodeStatus(str, Enum):
     Idle = "Idle"
     Running = "Running"
-    Paused = "Paused"
diff --git a/shared/types/worker/ops.py b/shared/types/worker/ops.py
index 82db7c77..0987f3c7 100644
--- a/shared/types/worker/ops.py
+++ b/shared/types/worker/ops.py
@@ -16,7 +16,6 @@ class RunnerOpType(str, Enum):
     RUNNER_UP = "runner_up"
     RUNNER_DOWN = "runner_down"
     RUNNER_FAILED = "runner_failed"
-    DOWNLOAD = "download"
     CHAT_COMPLETION = "chat_completion"
 
 RunnerOpT = TypeVar("RunnerOpT", bound=RunnerOpType)
@@ -47,13 +46,6 @@ class RunnerFailedOp(BaseRunnerOp[Literal[RunnerOpType.RUNNER_FAILED]]):
     op_type: Literal[RunnerOpType.RUNNER_FAILED] = Field(default=RunnerOpType.RUNNER_FAILED, frozen=True)
     runner_id: RunnerId
 
-class DownloadOp(BaseRunnerOp[Literal[RunnerOpType.DOWNLOAD]]):
-    op_type: Literal[RunnerOpType.DOWNLOAD] = Field(default=RunnerOpType.DOWNLOAD, frozen=True)
-    instance_id: InstanceId
-    runner_id: RunnerId
-    shard_metadata: ShardMetadata
-    hosts: list[Host]
-
 class ExecuteTaskOp(BaseRunnerOp[Literal[RunnerOpType.CHAT_COMPLETION]]):
     op_type: Literal[RunnerOpType.CHAT_COMPLETION] = Field(default=RunnerOpType.CHAT_COMPLETION, frozen=True)
     runner_id: RunnerId
@@ -68,7 +60,6 @@ RunnerOp = Annotated[
         RunnerUpOp,
         RunnerDownOp,
         RunnerFailedOp,
-        DownloadOp,
         ExecuteTaskOp,
     ],
     Field(discriminator="op_type")
diff --git a/shared/types/worker/runners.py b/shared/types/worker/runners.py
index 51a08958..c1428f7e 100644
--- a/shared/types/worker/runners.py
+++ b/shared/types/worker/runners.py
@@ -12,9 +12,8 @@ from shared.types.worker.shards import ShardMetadata
 
 
 class RunnerStatusType(str, Enum):
-    Assigned = "Assigned"
     Downloading = "Downloading"
-    Ready = "Ready"
+    Inactive = "Inactive"
     Starting = "Starting"
     Loaded = "Loaded"
     Running = "Running"
@@ -28,41 +27,30 @@ class BaseRunnerStatus(BaseModel, Generic[RunnerStatusTypeT]):
     runner_status: RunnerStatusTypeT
 
 
-# Emitted by the Master
-class AssignedRunnerStatus(BaseRunnerStatus[RunnerStatusType.Assigned]):
-    runner_status: Literal[RunnerStatusType.Assigned] = Field(default=RunnerStatusType.Assigned)
-
-# Emitted by the Worker
 class DownloadingRunnerStatus(BaseRunnerStatus[RunnerStatusType.Downloading]):
     runner_status: Literal[RunnerStatusType.Downloading] = Field(default=RunnerStatusType.Downloading)
     download_progress: DownloadProgress
 
-# Emitted by the Worker
-class ReadyRunnerStatus(BaseRunnerStatus[RunnerStatusType.Ready]):
-    runner_status: Literal[RunnerStatusType.Ready] = Field(default=RunnerStatusType.Ready)
+class InactiveRunnerStatus(BaseRunnerStatus[RunnerStatusType.Inactive]):
+    runner_status: Literal[RunnerStatusType.Inactive] = Field(default=RunnerStatusType.Inactive)
 
-# Emitted by the Master
 class StartingRunnerStatus(BaseRunnerStatus[RunnerStatusType.Starting]):
     runner_status: Literal[RunnerStatusType.Starting] = Field(default=RunnerStatusType.Starting)
 
-# Emitted by the Worker
 class LoadedRunnerStatus(BaseRunnerStatus[RunnerStatusType.Loaded]):
     runner_status: Literal[RunnerStatusType.Loaded] = Field(default=RunnerStatusType.Loaded)
 
-# Emitted by the Worker
 class RunningRunnerStatus(BaseRunnerStatus[RunnerStatusType.Running]):
     runner_status: Literal[RunnerStatusType.Running] = Field(default=RunnerStatusType.Running)
 
-# Emitted by the Worker
 class FailedRunnerStatus(BaseRunnerStatus[RunnerStatusType.Failed]):
     runner_status: Literal[RunnerStatusType.Failed] = Field(default=RunnerStatusType.Failed)
     error_message: str | None = None
 
 
 RunnerStatus = Annotated[
-    AssignedRunnerStatus
-    | DownloadingRunnerStatus
-    | ReadyRunnerStatus
+    DownloadingRunnerStatus
+    | InactiveRunnerStatus
     | StartingRunnerStatus
     | LoadedRunnerStatus
     | RunningRunnerStatus
diff --git a/worker/common.py b/worker/common.py
new file mode 100644
index 00000000..ffbe07db
--- /dev/null
+++ b/worker/common.py
@@ -0,0 +1,35 @@
+from copy import deepcopy
+from typing import Optional
+
+from pydantic import BaseModel, ConfigDict
+
+from shared.types.common import Host
+from shared.types.events import (
+    InstanceId,
+    RunnerStatusUpdated,
+)
+from shared.types.worker.common import RunnerId
+from shared.types.worker.runners import (
+    RunnerStatus,
+)
+from shared.types.worker.shards import ShardMetadata
+from worker.runner.runner_supervisor import RunnerSupervisor
+
+
+class AssignedRunner(BaseModel):
+    runner_id: RunnerId
+    instance_id: InstanceId
+    shard_metadata: ShardMetadata  # just data
+    hosts: list[Host]
+
+    status: RunnerStatus
+    failures: list[tuple[float, Exception]] = []
+    runner: Optional[RunnerSupervisor]  # set if the runner is 'up'
+
+    model_config = ConfigDict(arbitrary_types_allowed=True)
+    
+    def status_update_event(self) -> RunnerStatusUpdated:
+        return RunnerStatusUpdated(
+            runner_id=self.runner_id,
+            runner_status=deepcopy(self.status),
+        )
diff --git a/worker/download/conftest.py b/worker/download/conftest.py
index 3c821c98..9f60b97a 100644
--- a/worker/download/conftest.py
+++ b/worker/download/conftest.py
@@ -1,5 +1,3 @@
-from pathlib import Path
-
 import pytest
 
 from shared.models.model_meta import get_model_meta
@@ -13,7 +11,7 @@ async def model_meta() -> ModelMetadata:
 
 
 @pytest.fixture
-def pipeline_shard_meta(model_meta: ModelMetadata, tmp_path: Path):
+def pipeline_shard_meta(model_meta: ModelMetadata):
     def _pipeline_shard_meta(
         num_nodes: int = 1, device_rank: int = 0
     ) -> PipelineShardMetadata:
diff --git a/worker/main.py b/worker/main.py
index 0fd25765..01e4d562 100644
--- a/worker/main.py
+++ b/worker/main.py
@@ -1,658 +1,52 @@
 import asyncio
 import logging
-import time
-from asyncio import Queue
-from copy import deepcopy
-from functools import partial
-from time import process_time
-from typing import AsyncGenerator, Optional
-
-from pydantic import BaseModel, ConfigDict
 
 from shared.apply import apply
-from shared.db.sqlite import AsyncSQLiteEventStorage
 from shared.db.sqlite.event_log_manager import EventLogConfig, EventLogManager
-from shared.types.common import Host, NodeId
+from shared.types.common import NodeId
 from shared.types.events import (
-    ChunkGenerated,
-    Event,
-    InstanceDeleted,
-    InstanceId,
-    NodePerformanceMeasured,
-    RunnerDeleted,
-    RunnerStatusUpdated,
-    TaskFailed,
-    TaskStateUpdated,
+        NodePerformanceMeasured,
 )
 from shared.types.profiling import NodePerformanceProfile
-from shared.types.state import State
-from shared.types.tasks import TaskId, TaskStatus
-from shared.types.worker.common import RunnerId
-from shared.types.worker.downloads import (
-    DownloadCompleted,
-    DownloadFailed,
-    DownloadOngoing,
-    DownloadProgressData,
-)
-from shared.types.worker.instances import InstanceStatus
 from shared.types.worker.ops import (
-    AssignRunnerOp,
-    DownloadOp,
-    ExecuteTaskOp,
-    RunnerDownOp,
-    RunnerFailedOp,
-    RunnerOp,
-    RunnerOpType,
-    RunnerUpOp,
-    UnassignRunnerOp,
+        RunnerOp,
 )
-from shared.types.worker.runners import (
-    AssignedRunnerStatus,
-    DownloadingRunnerStatus,
-    FailedRunnerStatus,
-    LoadedRunnerStatus,
-    ReadyRunnerStatus,
-    RunnerStatus,
-    RunnerStatusType,
-    RunningRunnerStatus,
-)
-from shared.types.worker.shards import ShardMetadata
 from shared.utils import get_node_id_keypair
 from worker.download.impl_shard_downloader import exo_shard_downloader
-from worker.download.shard_downloader import RepoDownloadProgress, ShardDownloader
-from worker.runner.runner_supervisor import RunnerSupervisor
+from worker.plan import plan
 from worker.utils.profile import start_polling_node_metrics
+from worker.worker import Worker
 
 
-class AssignedRunner(BaseModel):
-    runner_id: RunnerId
-    instance_id: InstanceId
-    shard_metadata: ShardMetadata  # just data
-    hosts: list[Host]
-
-    status: RunnerStatus
-    failures: list[tuple[float, Exception]] = []
-    runner: Optional[RunnerSupervisor]  # set if the runner is 'up'
-
-    model_config = ConfigDict(arbitrary_types_allowed=True)
-
-    is_downloaded: bool = False
-    
-    def set_is_downloaded(self, is_downloaded: bool) -> None:
-        self.is_downloaded = is_downloaded
-    
-    def status_update_event(self) -> RunnerStatusUpdated:
-        return RunnerStatusUpdated(
-            runner_id=self.runner_id,
-            runner_status=deepcopy(self.status),
-        )
-
-class Worker:
-    def __init__(
-        self,
-        node_id: NodeId,
-        logger: logging.Logger,
-        shard_downloader: ShardDownloader,
-        worker_events: AsyncSQLiteEventStorage | None,
-        global_events: AsyncSQLiteEventStorage | None,
-    ):
-        self.node_id: NodeId = node_id
-        self.state: State = State()
-        self.shard_downloader: ShardDownloader = shard_downloader
-        self.worker_events: AsyncSQLiteEventStorage | None = worker_events # worker_events is None in some tests.
-        self.global_events: AsyncSQLiteEventStorage | None = global_events
-        self.logger: logging.Logger = logger
-
-        self.assigned_runners: dict[RunnerId, AssignedRunner] = {}
-        self._task: asyncio.Task[None] | None = None
-
-    ## Op Executors
-
-    async def _execute_assign_op(
-        self, op: AssignRunnerOp
-    ) -> AsyncGenerator[Event, None]:
-        '''
-        Here, we are sure that the model is already downloaded.
-        This op moves the runner from Assigned -> Ready state.
-        '''
-        self.assigned_runners[op.runner_id] = AssignedRunner(
-            runner_id=op.runner_id,
-            instance_id=op.instance_id,
-            shard_metadata=op.shard_metadata,
-            hosts=op.hosts,
-            status=AssignedRunnerStatus(),
-            runner=None,
-        )
-
-        yield self.assigned_runners[op.runner_id].status_update_event()
-
-    async def _execute_unassign_op(
-        self, op: UnassignRunnerOp
-    ) -> AsyncGenerator[Event, None]:
-        if op.runner_id not in self.assigned_runners:
-            return
-
-        # We can try to do a graceful shutdown of the runner.
-        runner: RunnerSupervisor | None = self.assigned_runners[op.runner_id].runner
-        if runner is not None:
-            await runner.astop()
-
-        # This is all we really need:
-        del self.assigned_runners[op.runner_id]
-        yield RunnerDeleted(runner_id=op.runner_id)
-
-        return
-        yield
-
-    async def _execute_runner_up_op(
-        self, op: RunnerUpOp, initialize_timeout: Optional[float] = None
-    ) -> AsyncGenerator[Event, None]:
-        assigned_runner = self.assigned_runners[op.runner_id]
-
-        # TODO: This should be dynamic, based on the size of the model.
-        if not initialize_timeout:
-            gigabytes_per_second = 10
-            
-            shard = assigned_runner.shard_metadata
-            weights_size_kb = (shard.end_layer - shard.start_layer) / shard.n_layers * shard.model_meta.storage_size_kilobytes
-            
-            initialize_timeout = weights_size_kb / (1024**2 * gigabytes_per_second) + 2.0 # Add a constant 2.0 to ensure connection can be made as well
-
-        try:
-            assigned_runner.runner = await asyncio.wait_for(
-                RunnerSupervisor.create(
-                    model_shard_meta=assigned_runner.shard_metadata,
-                    hosts=assigned_runner.hosts,
-                    logger=self.logger,
-                ),
-                timeout=initialize_timeout,
-            )
-        except TimeoutError as e:
-            import traceback
-
-            tb = traceback.format_exc()
-            e = Exception(f"{type(e).__name__}: {str(e)}. Traceback: {tb}")
-            async for event in self._fail_runner(e=e, runner_id=op.runner_id):
-                yield event
-            return
-
-        if assigned_runner.runner.healthy:
-            assigned_runner.status = LoadedRunnerStatus()
-        else:
-            assigned_runner.status = FailedRunnerStatus()
-        yield self.assigned_runners[op.runner_id].status_update_event()
-
-    async def _execute_runner_down_op(
-        self, op: RunnerDownOp
-    ) -> AsyncGenerator[Event, None]:
-        assigned_runner = self.assigned_runners[op.runner_id]
-
-        if isinstance(assigned_runner.runner, RunnerSupervisor):
-            await assigned_runner.runner.astop()
-
-        assigned_runner.runner = None
-
-        assigned_runner.status = ReadyRunnerStatus()
-        yield assigned_runner.status_update_event()
-        return
-
-    async def _execute_runner_failed_op(
-        self, op: RunnerFailedOp
-    ) -> AsyncGenerator[Event, None]:
-        '''
-        We detected that this runner has failed. So we'll put it into 'failed' state now, triggering the rest of the instance to spin down.
-        '''
-        assigned_runner = self.assigned_runners[op.runner_id]
-
-        assigned_runner.status = FailedRunnerStatus()
-        yield self.assigned_runners[op.runner_id].status_update_event()
-
-    async def _execute_download_op(
-        self, op: DownloadOp
-    ) -> AsyncGenerator[Event, None]:
-        '''
-        The model needs assigning and then downloading.
-        This op moves the runner from Assigned -> Downloading -> Ready state.
-        '''
-        
-        initial_progress = await self.shard_downloader.get_shard_download_status_for_shard(op.shard_metadata)
-        if initial_progress.status == "complete":
-            self.assigned_runners[op.runner_id].set_is_downloaded(True)
-            self.assigned_runners[op.runner_id].status = DownloadingRunnerStatus(
-                download_progress=DownloadCompleted(
-                    node_id=self.node_id,
-                )
-            )
-            yield self.assigned_runners[op.runner_id].status_update_event()
-            self.assigned_runners[op.runner_id].status = ReadyRunnerStatus()
-            yield self.assigned_runners[op.runner_id].status_update_event()
-            return
-        
-        initial_status = DownloadingRunnerStatus(
-            download_progress=DownloadOngoing(
-                node_id=self.node_id,
-                download_progress=DownloadProgressData(
-                    total_bytes=initial_progress.total_bytes,
-                    downloaded_bytes=initial_progress.downloaded_bytes
-                )
-            )
-        )
-
-        self.assigned_runners[op.runner_id] = AssignedRunner(
-            runner_id=op.runner_id,
-            instance_id=op.instance_id,
-            shard_metadata=op.shard_metadata,
-            hosts=op.hosts,
-            status=initial_status,
-            runner=None,
-        )
-        assigned_runner: AssignedRunner = self.assigned_runners[op.runner_id]
-        yield assigned_runner.status_update_event()
-
-        # Download it!
-        # TODO: we probably want download progress as part of a callback that gets passed to the downloader.
-        download_progress_queue: asyncio.Queue[RepoDownloadProgress] = asyncio.Queue()
-        def download_progress_callback(shard: ShardMetadata, progress: RepoDownloadProgress) -> None:
-            download_progress_queue.put_nowait(progress)
-
-
-        self.shard_downloader.on_progress(download_progress_callback)
-
-        asyncio.create_task(self.shard_downloader.ensure_shard(op.shard_metadata))
-
-        # TODO: Dynamic timeout, timeout on no packet update received.
-        timeout_secs = 10 * 60
-        start_time = process_time()
-        last_yield_progress = start_time
-        while process_time() - start_time < timeout_secs:
-            progress: RepoDownloadProgress = await download_progress_queue.get()
-            if progress.status == "complete":
-                assigned_runner.status = DownloadingRunnerStatus(
-                    download_progress=DownloadCompleted(
-                        node_id=self.node_id,
-                    )
-                )
-                yield assigned_runner.status_update_event()
-                assigned_runner.set_is_downloaded(True)
-                assigned_runner.status = ReadyRunnerStatus()
-                yield assigned_runner.status_update_event()
-                break
-            elif progress.status == "in_progress":
-                if process_time() - last_yield_progress > 1:
-                    assigned_runner.status = DownloadingRunnerStatus(
-                        download_progress=DownloadOngoing(
-                            node_id=self.node_id,
-                            download_progress=DownloadProgressData(
-                                total_bytes=progress.total_bytes,
-                                downloaded_bytes=progress.downloaded_bytes,
-                            )
-                        )
-                    )
-                    yield assigned_runner.status_update_event()
-                    last_yield_progress = process_time()
-        else:
-            assigned_runner.status = DownloadingRunnerStatus(
-                download_progress=DownloadFailed(
-                    node_id=self.node_id,
-                    error_message=f"Timeout downloading model: {op.shard_metadata.model_meta.model_id}"
-                )
-            )
-            yield assigned_runner.status_update_event()
-
-
-    async def _execute_task_op(
-        self, op: ExecuteTaskOp
-    ) -> AsyncGenerator[Event, None]:
-        '''
-        This is the entry point for a chat completion starting.
-        While there is only one execute function, it will get called in different ways for runner 0 and runner [1, 2, 3, ...].
-        Runners [1, 2, 3, ...] will run this method when a task is in 'pending' state.
-        Runner 0 will run this method when a task is in 'running' state.
-        TODO: How do we handle the logic of ensuring that n-1 nodes have started their execution before allowing the 0'th runner to start?
-        This is still a little unclear to me.
-        '''
-        assigned_runner = self.assigned_runners[op.runner_id]
-
-        async def inner_execute(queue: asyncio.Queue[Event]) -> None:
-            async def running_callback(queue: asyncio.Queue[Event]) -> None:
-                # Called when the MLX process has been kicked off
-                assigned_runner.status = RunningRunnerStatus()
-                await queue.put(assigned_runner.status_update_event())
-
-                if assigned_runner.shard_metadata.device_rank == 0:
-                    await queue.put(TaskStateUpdated(
-                        task_id=op.task.task_id,
-                        task_status=TaskStatus.RUNNING,
-                    ))
-
-            try:
-                assert assigned_runner.runner is not None
-                assert assigned_runner.runner.healthy
-
-                async for chunk in assigned_runner.runner.stream_response(
-                        task=op.task,
-                        request_started_callback=partial(running_callback, queue)):
-                    if assigned_runner.shard_metadata.device_rank == 0:
-                        await queue.put(ChunkGenerated(
-                            # todo: at some point we will no longer have a bijection between task_id and row_id. 
-                            # So we probably want to store a mapping between these two in our Worker object.
-                            command_id=chunk.command_id, 
-                            chunk=chunk
-                        ))
-
-                if assigned_runner.shard_metadata.device_rank == 0:
-                    await queue.put(TaskStateUpdated(
-                        task_id=op.task.task_id,
-                        task_status=TaskStatus.COMPLETE,
-                    ))
-
-                # After a successful inference:
-                assigned_runner.status = LoadedRunnerStatus()
-                await queue.put(assigned_runner.status_update_event())
-
-
-            except Exception as e:
-                # An exception occurs in the runner supervisor
-                self.logger.warning(f'Runner failed whilst running inference task. Task: {op.task}. Error: {e}')
-                async for event in self._fail_task(e, op.runner_id, op.task.task_id):
-                    await queue.put(event)
-
-        queue: Queue[Event] = asyncio.Queue()
-        task = asyncio.create_task(inner_execute(queue))
-
-        # TODO: Initial (prefil) timeout can be dynamic
-        # model_kb = assigned_runner.shard_metadata.model_meta.storage_size_kilobytes
-
-        try:
-            # Yield items from the queue
-            # timeout = 30.
-            timeout = 3.
-            while True:
-                item: Event = await asyncio.wait_for(queue.get(), timeout=timeout)
-                yield item
-                timeout = 2.
-                if isinstance(item, RunnerStatusUpdated) and isinstance(
-                    item.runner_status, (LoadedRunnerStatus, FailedRunnerStatus)
-                ):
-                    if isinstance(item.runner_status, LoadedRunnerStatus):
-                        assigned_runner.failures = []
-                        
-                    break
-        except TimeoutError as e:
-            # Runner supervisor doesn't respond in time; so we put the runner & task into a failed state
-            self.logger.warning(f'Timed out waiting for runner response to inference task. Task: {op.task}.')
-            async for event in self._fail_task(e, op.runner_id, op.task.task_id):
-                yield event
-        finally:
-            # Ensure the task is cleaned up
-            try:
-                await asyncio.wait_for(task, timeout=5)
-            except asyncio.TimeoutError:
-                self.logger.warning("Timed out waiting for task cleanup after inference execution.")
-        
-
-    ## Operation Planner
-
-    async def _execute_op(self, op: RunnerOp) -> AsyncGenerator[Event, None]:
-        ## It would be great if we can get rid of this async for ... yield pattern.
-        match op.op_type:
-            case RunnerOpType.ASSIGN_RUNNER:
-                event_generator = self._execute_assign_op(op)
-            case RunnerOpType.UNASSIGN_RUNNER:
-                event_generator = self._execute_unassign_op(op)
-            case RunnerOpType.RUNNER_UP:
-                event_generator = self._execute_runner_up_op(op)
-            case RunnerOpType.RUNNER_DOWN:
-                event_generator = self._execute_runner_down_op(op)
-            case RunnerOpType.RUNNER_FAILED:
-                event_generator = self._execute_runner_failed_op(op)
-            case RunnerOpType.DOWNLOAD:
-                event_generator = self._execute_download_op(op)
-            case RunnerOpType.CHAT_COMPLETION:
-                event_generator = self._execute_task_op(op)
-
-        async for event in event_generator:
-            yield event
-
-    ## Planning logic
-    def plan(self, state: State) -> RunnerOp | None:
-        # Compare state to worker 'mood'
-
-        # for runner_id, assigned_runner in self.assigned_runners.items():
-        #     if len(assigned_runner.failures) == 3:
-        #         raise Exception('Too many error occurred in assigned runner - assumed to be recurrent and unrecoverable.\nErrors are as follows: {assigned_runner.failures}')
-
-        # First, unassign assigned runners that are no longer in the state.
-        for runner_id, _ in self.assigned_runners.items():
-            runner_ids: list[RunnerId] = [
-                runner_id
-                for instance in state.instances.values()
-                for runner_id in instance.shard_assignments.runner_to_shard
-            ]
-            if runner_id not in runner_ids:
-                return UnassignRunnerOp(runner_id=runner_id)
-
-        for runner_id, assigned_runner in self.assigned_runners.items():
-            if assigned_runner.runner is not None and \
-                not assigned_runner.runner.healthy and \
-                not isinstance(assigned_runner.status, FailedRunnerStatus):
-                return RunnerFailedOp(runner_id=runner_id)
-
-        # Then spin down active runners
-        for _instance_id, instance in state.instances.items():
-            for node_id, runner_id in instance.shard_assignments.node_to_runner.items():
-                if node_id != self.node_id:
-                    continue
-
-                # We spin down a runner if it's meant to be inactive and it's Loaded.
-                if runner_id in self.assigned_runners and \
-                    isinstance(self.assigned_runners[runner_id].status, LoadedRunnerStatus) and \
-                    instance.instance_type == InstanceStatus.INACTIVE:
-                    return RunnerDownOp(runner_id=runner_id)
-
-        # If we are part of an instance that has a dead node - and we aren't the dead node - we should spin down
-        # TODO: We need to limit number of retries if we keep failing.
-        for _instance_id, instance in state.instances.items():
-            if self.node_id in instance.shard_assignments.node_to_runner and \
-                instance.shard_assignments.node_to_runner[self.node_id] in self.assigned_runners and \
-                not isinstance(self.assigned_runners[instance.shard_assignments.node_to_runner[self.node_id]].status, ReadyRunnerStatus): # make sure that our runner has not already been spun down into ready state
-                other_node_in_instance_has_failed = False
-                for runner_id in instance.shard_assignments.runner_to_shard:
-                    if runner_id in state.runners and \
-                        isinstance(state.runners[runner_id], FailedRunnerStatus) and \
-                        runner_id not in self.assigned_runners:
-                        other_node_in_instance_has_failed= True
-
-                if other_node_in_instance_has_failed:
-                    # Spin down *our* runner
-                    return RunnerDownOp(runner_id=instance.shard_assignments.node_to_runner[self.node_id])
-
-        # If we are failed - and *all of the other nodes have spun down* - then we can spin down too.
-        for _instance_id, instance in state.instances.items():
-            if self.node_id in instance.shard_assignments.node_to_runner and \
-                instance.shard_assignments.node_to_runner[self.node_id] in state.runners and \
-                instance.shard_assignments.node_to_runner[self.node_id] in self.assigned_runners and \
-                isinstance(self.assigned_runners[instance.shard_assignments.node_to_runner[self.node_id]].status, FailedRunnerStatus):
-
-                num_spundown_nodes = 0
-                for runner_id in instance.shard_assignments.runner_to_shard:
-                    if isinstance(state.runners[runner_id], ReadyRunnerStatus) and \
-                        runner_id not in self.assigned_runners:
-                        num_spundown_nodes += 1
-                    # Suggested:
-                    # if runner_id in state.runners and isinstance(state.runners[runner_id], ReadyRunnerStatus):
-                    #     if runner_id != instance.shard_assignments.node_to_runner[self.node_id]:
-                    #         num_spundown_nodes += 1
-
-                if num_spundown_nodes == next(iter(instance.shard_assignments.runner_to_shard.values())).world_size - 1:
-                    # All the other nodes are spun down - so now we can spin down too.
-                    # This also catches the case of 1-node. If there's one node in the instance then we should spin down straight away
-                    return RunnerDownOp(runner_id=instance.shard_assignments.node_to_runner[self.node_id])
-
-        # Then assign runners we do want
-        for instance_id, instance in state.instances.items():
-            for node_id, runner_id in instance.shard_assignments.node_to_runner.items():
-                if node_id != self.node_id:
-                    continue
-
-                if runner_id not in self.assigned_runners:
-                    return AssignRunnerOp(
-                        runner_id=runner_id,
-                        instance_id=instance_id,
-                        shard_metadata=instance.shard_assignments.runner_to_shard[runner_id],
-                        hosts=instance.hosts
-                    )
-
-        # Then make sure things are downloading.
-        for instance_id, instance in state.instances.items():
-            # We should already have asserted that this runner exists
-            # If it didn't exist then we return a assign_runner op.
-            for node_id, runner_id in instance.shard_assignments.node_to_runner.items():
-                if node_id != self.node_id:
-                    continue
-                assert runner_id in self.assigned_runners
-
-                runner = self.assigned_runners[runner_id]
-
-                if not runner.is_downloaded:
-                    if runner.status.runner_status == RunnerStatusType.Downloading: # Forward compatibility
-                        # TODO: If failed status then we retry
-                        return None
-                    else:
-                        return DownloadOp(
-                            runner_id=runner_id,
-                            instance_id=instance_id,
-                            shard_metadata=instance.shard_assignments.runner_to_shard[runner_id],
-                            hosts=instance.hosts
-                        )
-
-        # Then spin up 'ready' runners that should be active
-        for _instance_id, instance in state.instances.items():
-            if self.node_id in instance.shard_assignments.node_to_runner and \
-                self.assigned_runners[instance.shard_assignments.node_to_runner[self.node_id]].runner is None and \
-                instance.instance_type == InstanceStatus.ACTIVE:
-
-                # We are part of this instance, we want it up but it hasn't been spun up yet.
-                # Need to assert all other runners are ready before we can spin up.
-                ready_to_spin = True
-                for runner_id in instance.shard_assignments.node_to_runner.values():
-                    if runner_id in state.runners and state.runners[runner_id].runner_status != RunnerStatusType.Ready:
-                        ready_to_spin = False
-
-                if ready_to_spin:
-                    return RunnerUpOp(runner_id=instance.shard_assignments.node_to_runner[self.node_id])
-
-        # Then make sure things are running based on tasks.
-        for instance_id, instance in state.instances.items():
-            for node_id, runner_id in instance.shard_assignments.node_to_runner.items():
-                if node_id != self.node_id:
-                    continue
-                assert runner_id in self.assigned_runners
-                runner = self.assigned_runners[runner_id]
-                if runner.status.runner_status != RunnerStatusType.Loaded:
-                    continue # The only previous state to get to Running is from Loaded
-
-                for _, task in state.tasks.items():
-                    if task.instance_id == instance_id and (
-                        task.task_status == TaskStatus.PENDING or task.task_status == TaskStatus.FAILED
-                    ):
-                        if (runner.shard_metadata.device_rank >= 1 or runner.shard_metadata.world_size == 1):
-                            return ExecuteTaskOp(runner_id=runner_id, task=task)
-                        else:
-                            # We already know our own status is Loaded. We are rank 0,
-                            # so let's check that all the other runners are running - ready for us to fire the prompt.
-                            running_runner_count = 0
-                            for other_runner_id, other_runner_status in state.runners.items():
-                                if other_runner_id in instance.shard_assignments.node_to_runner.values() and \
-                                        isinstance(other_runner_status, RunningRunnerStatus):
-                                    running_runner_count += 1
-
-                            if running_runner_count == runner.shard_metadata.world_size - 1:
-                                return ExecuteTaskOp(runner_id=runner_id, task=task)
-
-        return None
-
-
-    async def _fail_runner(self, e: Exception, runner_id: RunnerId) -> AsyncGenerator[Event]:
-        if runner_id in self.assigned_runners:
-            assigned_runner = self.assigned_runners[runner_id]
-
-            assigned_runner.runner = None
-            assigned_runner.status = FailedRunnerStatus(error_message=str(e))
-            assigned_runner.failures.append(
-                (
-                    time.time(),
-                    e
-                )
-            )
-
-            # Reset failure count back to 0 when succesful
-            if len(assigned_runner.failures) >= 3:
-                # Too many retries. We will emit a DeleteInstance 
-                yield InstanceDeleted(
-                    instance_id=assigned_runner.instance_id
-                )
-
-            yield assigned_runner.status_update_event()
-
-    
-    async def _fail_task(self, e: Exception, runner_id: RunnerId, task_id: TaskId) -> AsyncGenerator[Event]:
-        if runner_id in self.assigned_runners:
-            yield TaskStateUpdated(
-                task_id=task_id,
-                task_status=TaskStatus.FAILED,
-            )
-
-            yield TaskFailed(
-                task_id=task_id,
-                error_type=str(type(e)),
-                error_message=str(e)
-            )
-
-            async for event in self._fail_runner(e, runner_id):
-                yield event
-
-
-    async def event_publisher(self, event: Event) -> None:
-        assert self.worker_events is not None
-        await self.worker_events.append_events([event], self.node_id)
-        self.logger.info(f"published event: {event}")
-
-    # Handle state updates
-    async def run(self):
-        assert self.global_events is not None
+async def run(worker_state: Worker):
+        assert worker_state.global_events is not None
 
         while True:
             # 1. get latest events
-            events = await self.global_events.get_events_since(self.state.last_event_applied_idx)
+            events = await worker_state.global_events.get_events_since(worker_state.state.last_event_applied_idx)
 
             # 2. for each event, apply it to the state and run sagas
             for event_from_log in events:
-                self.state = apply(self.state, event_from_log)
+                worker_state.state = apply(worker_state.state, event_from_log)
 
             # 3. based on the updated state, we plan & execute an operation.
-            op: RunnerOp | None = self.plan(self.state)
+            op: RunnerOp | None = plan(
+                worker_state.assigned_runners,
+                worker_state.node_id,
+                worker_state.state.instances,
+                worker_state.state.runners,
+                worker_state.state.tasks,
+            )
             if op is not None:
-                self.logger.info(f"!!! plan result: {op}")
+                worker_state.logger.info(f"!!! plan result: {op}")
 
             # run the op, synchronously blocking for now
             if op is not None:
-                try:
-                    async for event in self._execute_op(op):
-                        await self.event_publisher(event)
-                except Exception as e:
-                    # execeute_task_op already has its own exception handling here. So we assume we had an exception in one of the other op types.
-                    # we therefore just fail the runner.
-                    self.logger.warning(f"Encountered exception when executing worker op {op}: {e}. \n Runner will be spun down and retried.")
-                    async for event in self._fail_runner(
-                        e, 
-                        runner_id=op.runner_id, 
-                    ):
-                        await self.event_publisher(event)
+                async for event in worker_state.execute_op(op):
+                    await worker_state.event_publisher(event)
 
             await asyncio.sleep(0.01)
-            if len(events) > 0:
-                self.logger.info(f"state: {self.state}")
+
 
 
 async def main():
@@ -678,7 +72,7 @@ async def main():
 
     worker = Worker(node_id, logger, shard_downloader, event_log_manager.worker_events, event_log_manager.global_events)
 
-    await worker.run()
+    await run(worker)
 
 if __name__ == "__main__":
     asyncio.run(main())
diff --git a/worker/plan.py b/worker/plan.py
new file mode 100644
index 00000000..4d644023
--- /dev/null
+++ b/worker/plan.py
@@ -0,0 +1,205 @@
+from typing import Mapping
+
+from shared.types.common import NodeId
+from shared.types.events import (
+    InstanceId,
+)
+from shared.types.tasks import Task, TaskId, TaskStatus
+from shared.types.worker.common import RunnerId
+from shared.types.worker.instances import Instance, InstanceStatus
+from shared.types.worker.ops import (
+    AssignRunnerOp,
+    ExecuteTaskOp,
+    RunnerDownOp,
+    RunnerFailedOp,
+    RunnerOp,
+    RunnerUpOp,
+    UnassignRunnerOp,
+)
+from shared.types.worker.runners import (
+    DownloadingRunnerStatus,
+    FailedRunnerStatus,
+    InactiveRunnerStatus,
+    LoadedRunnerStatus,
+    RunnerStatus,
+    RunnerStatusType,
+    RunningRunnerStatus,
+)
+from worker.common import AssignedRunner
+
+
+def unassign_runners(instances: Mapping[InstanceId, Instance], state_runners: Mapping[RunnerId, RunnerStatus], assigned_runners: dict[RunnerId, AssignedRunner]) -> UnassignRunnerOp | None:
+    runner_ids: set[RunnerId] = {
+        runner_id
+        for instance in instances.values()
+        for runner_id in instance.shard_assignments.runner_to_shard
+    }
+    for runner_id, _ in assigned_runners.items():
+        if runner_id not in runner_ids:
+            return UnassignRunnerOp(runner_id=runner_id)
+
+    # If our instance is in 'downloading' or 'assigned' state, then we know the runner is stale. These are part of AssignRunnerOp and should be blocking.
+    for assigned_runner_id in assigned_runners:
+        if assigned_runner_id in state_runners and \
+            isinstance(state_runners[assigned_runner_id], DownloadingRunnerStatus):
+            return UnassignRunnerOp(runner_id=assigned_runner_id)
+
+    return None
+
+def failed_runners(assigned_runners: dict[RunnerId, AssignedRunner]) -> RunnerFailedOp | None:
+    for runner_id, assigned_runner in assigned_runners.items():
+        if assigned_runner.runner is not None and \
+            not assigned_runner.runner.healthy and \
+            not isinstance(assigned_runner.status, FailedRunnerStatus):
+            return RunnerFailedOp(runner_id=runner_id)
+    return None
+
+def spin_down_runners(
+    instances: Mapping[InstanceId, Instance], 
+    assigned_runners: dict[RunnerId, AssignedRunner], 
+    state_runners: Mapping[RunnerId, RunnerStatus],
+    worker_node_id: NodeId) -> RunnerDownOp | None:
+    for _instance_id, instance in instances.items():
+        for node_id, runner_id in instance.shard_assignments.node_to_runner.items():
+            if node_id != worker_node_id:
+                continue
+
+            # We spin down a runner if it's meant to be inactive and it's Loaded.
+            if runner_id in assigned_runners and \
+                isinstance(assigned_runners[runner_id].status, LoadedRunnerStatus) and \
+                instance.instance_type == InstanceStatus.INACTIVE:
+                return RunnerDownOp(runner_id=runner_id)
+
+    # If we are part of an instance that has a dead node - and we aren't the dead node - we should spin down
+    for _instance_id, instance in instances.items():
+        if worker_node_id in instance.shard_assignments.node_to_runner and \
+            instance.shard_assignments.node_to_runner[worker_node_id] in assigned_runners and \
+            not isinstance(assigned_runners[instance.shard_assignments.node_to_runner[worker_node_id]].status, InactiveRunnerStatus): # make sure that our runner has not already been spun down into ready state
+            other_node_in_instance_has_failed = False
+            for runner_id in instance.shard_assignments.runner_to_shard:
+                if runner_id in state_runners and \
+                    isinstance(state_runners[runner_id], FailedRunnerStatus) and \
+                    runner_id not in assigned_runners:
+                    other_node_in_instance_has_failed= True
+
+            if other_node_in_instance_has_failed:
+                # Spin down *our* runner
+                return RunnerDownOp(runner_id=instance.shard_assignments.node_to_runner[worker_node_id])
+
+    # If we are failed - and *all of the other nodes have spun down* - then we can spin down too.
+    for _instance_id, instance in instances.items():
+        if worker_node_id in instance.shard_assignments.node_to_runner and \
+            instance.shard_assignments.node_to_runner[worker_node_id] in state_runners and \
+            instance.shard_assignments.node_to_runner[worker_node_id] in assigned_runners and \
+            isinstance(assigned_runners[instance.shard_assignments.node_to_runner[worker_node_id]].status, FailedRunnerStatus):
+
+            num_spundown_nodes = 0
+            for runner_id in instance.shard_assignments.runner_to_shard:
+                if isinstance(state_runners[runner_id], InactiveRunnerStatus) and \
+                    runner_id not in assigned_runners:
+                    num_spundown_nodes += 1
+                # Suggested:
+                # if runner_id in state_runners and isinstance(state.runners[runner_id], InactiveRunnerStatus):
+                #     if runner_id != instance.shard_assignments.node_to_runner[worker_node_id]:
+                #         num_spundown_nodes += 1
+
+            if num_spundown_nodes == next(iter(instance.shard_assignments.runner_to_shard.values())).world_size - 1:
+                # All the other nodes are spun down - so now we can spin down too.
+                # This also catches the case of 1-node. If there's one node in the instance then we should spin down straight away
+                return RunnerDownOp(runner_id=instance.shard_assignments.node_to_runner[worker_node_id])
+    return None
+
+def assign_runners(instances: Mapping[InstanceId, Instance], assigned_runners: dict[RunnerId, AssignedRunner], worker_node_id: NodeId) -> AssignRunnerOp | None:
+    for instance_id, instance in instances.items():
+        for node_id, runner_id in instance.shard_assignments.node_to_runner.items():
+            if node_id != worker_node_id:
+                continue
+
+            if runner_id not in assigned_runners:
+                return AssignRunnerOp(
+                    runner_id=runner_id,
+                    instance_id=instance_id,
+                    shard_metadata=instance.shard_assignments.runner_to_shard[runner_id],
+                    hosts=instance.hosts
+                )
+    return None
+
+def spin_up_runners(instances: Mapping[InstanceId, Instance], assigned_runners: dict[RunnerId, AssignedRunner], state_runners: Mapping[RunnerId, RunnerStatus], worker_node_id: NodeId) -> RunnerUpOp | None:
+    for _instance_id, instance in instances.items():
+        if worker_node_id in instance.shard_assignments.node_to_runner and \
+            assigned_runners[instance.shard_assignments.node_to_runner[worker_node_id]].runner is None and \
+            instance.instance_type == InstanceStatus.ACTIVE:
+
+            # We are part of this instance, we want it up but it hasn't been spun up yet.
+            # Need to assert all other runners are ready before we can spin up.
+            ready_to_spin = True
+            for runner_id in instance.shard_assignments.node_to_runner.values():
+                if runner_id in state_runners and state_runners[runner_id].runner_status != RunnerStatusType.Inactive:
+                    ready_to_spin = False
+
+            if ready_to_spin:
+                return RunnerUpOp(runner_id=instance.shard_assignments.node_to_runner[worker_node_id])
+    return None
+
+def execute_task_op(instances: Mapping[InstanceId, Instance], assigned_runners: dict[RunnerId, AssignedRunner], state_runners: Mapping[RunnerId, RunnerStatus], tasks: Mapping[TaskId, Task], worker_node_id: NodeId) -> ExecuteTaskOp | None:
+    for instance_id, instance in instances.items():
+        for node_id, runner_id in instance.shard_assignments.node_to_runner.items():
+            if node_id != worker_node_id:
+                continue
+            assert runner_id in assigned_runners
+            runner = assigned_runners[runner_id]
+            if runner.status.runner_status != RunnerStatusType.Loaded:
+                continue # The only previous state to get to Running is from Loaded
+
+            for _, task in tasks.items():
+                if task.instance_id == instance_id and (
+                    task.task_status == TaskStatus.PENDING or task.task_status == TaskStatus.FAILED
+                ):
+                    if (runner.shard_metadata.device_rank >= 1 or runner.shard_metadata.world_size == 1):
+                        return ExecuteTaskOp(runner_id=runner_id, task=task)
+                    else:
+                        # We already know our own status is Loaded. We are rank 0,
+                        # so let's check that all the other runners are running - ready for us to fire the prompt.
+                        running_runner_count = 0
+                        for other_runner_id, other_runner_status in state_runners.items():
+                            if other_runner_id in instance.shard_assignments.node_to_runner.values() and \
+                                    isinstance(other_runner_status, RunningRunnerStatus):
+                                running_runner_count += 1
+
+                        if running_runner_count == runner.shard_metadata.world_size - 1:
+                            return ExecuteTaskOp(runner_id=runner_id, task=task)
+
+    return None
+
+
+
+def plan(assigned_runners: dict[RunnerId, AssignedRunner], 
+         worker_node_id: NodeId, 
+         instances: Mapping[InstanceId, Instance], 
+         state_runners: Mapping[RunnerId, RunnerStatus], # all global
+         tasks: Mapping[TaskId, Task]) -> RunnerOp | None:
+    # First, unassign assigned runners that are no longer in the state.
+    if unop := unassign_runners(instances, state_runners, assigned_runners):
+        return unop
+
+    # mark failed runners that are not marked yet as failed
+    if failed_op := failed_runners(assigned_runners):
+        return failed_op
+
+    # spin down runners that are no longer needed
+    if down_op := spin_down_runners(instances, assigned_runners, state_runners, worker_node_id):
+        return down_op
+
+    # Then assign runners we do want
+    if assign_op := assign_runners(instances, assigned_runners, worker_node_id):
+        return assign_op
+
+    # Then spin up 'ready' runners that should be active
+    if runner_up_op := spin_up_runners(instances, assigned_runners, state_runners, worker_node_id):
+        return runner_up_op
+
+    # Then make sure things are running based on tasks.
+    if exec_op := execute_task_op(instances, assigned_runners, state_runners, tasks, worker_node_id):
+        return exec_op
+
+    return None
diff --git a/worker/runner/communication.py b/worker/runner/communication.py
index 85efa090..58104724 100644
--- a/worker/runner/communication.py
+++ b/worker/runner/communication.py
@@ -62,7 +62,7 @@ async def supervisor_read_response(
     assert proc.stdout is not None, (
         "proc.stdout should not be None when created with stdout=PIPE"
     )
-    line_bytes: bytes = await asyncio.wait_for(proc.stdout.readline(), timeout=10)
+    line_bytes: bytes = await asyncio.wait_for(proc.stdout.readline(), timeout=180)
     line: str = line_bytes.decode("utf-8").strip()
 
     if not line:
diff --git a/worker/tests/conftest.py b/worker/tests/conftest.py
index 2548fd05..7e31606f 100644
--- a/worker/tests/conftest.py
+++ b/worker/tests/conftest.py
@@ -1,35 +1,45 @@
-import asyncio
 from ipaddress import IPv4Address
 from logging import Logger, getLogger
-from pathlib import Path
-from typing import Awaitable, Callable
+from typing import Callable, Optional
 
 import pytest
 
-from shared.db.sqlite.connector import AsyncSQLiteEventStorage
-from shared.db.sqlite.event_log_manager import EventLogConfig, EventLogManager
 from shared.models.model_meta import get_model_meta
 from shared.types.api import ChatCompletionMessage, ChatCompletionTaskParams
-from shared.types.common import CommandId, Host, NodeId
+from shared.types.common import Host, NodeId
 from shared.types.models import ModelId, ModelMetadata
-from shared.types.state import State
 from shared.types.tasks import (
     ChatCompletionTask,
     TaskId,
     TaskStatus,
     TaskType,
 )
-from shared.types.worker.common import InstanceId, NodeStatus
+from shared.types.worker.common import InstanceId
 from shared.types.worker.instances import Instance, InstanceStatus
-from shared.types.worker.ops import (
-    AssignRunnerOp,
-    RunnerUpOp,
-)
 from shared.types.worker.runners import RunnerId, ShardAssignments
 from shared.types.worker.shards import PipelineShardMetadata
-from worker.download.shard_downloader import NoopShardDownloader
-from worker.main import Worker
+from worker.tests.constants import (
+    COMMAND_1_ID,
+    INSTANCE_1_ID,
+    MODEL_A_ID,
+    NODE_A,
+    RUNNER_1_ID,
+    TASK_1_ID,
+)
+
 
+@pytest.fixture
+def user_message():
+    """Override this fixture in tests to customize the message"""
+    return "Hello, how are you?"
+
+@pytest.fixture
+def logger() -> Logger:
+    return getLogger("test_logger")
+
+@pytest.fixture
+async def model_meta() -> ModelMetadata:
+    return await get_model_meta('mlx-community/Llama-3.2-1B-Instruct-4bit')
 
 @pytest.fixture
 def hosts():
@@ -44,29 +54,8 @@ def hosts():
 
     return _hosts
 
-
-@pytest.fixture
-def hosts_one(hosts: Callable[[int], list[Host]]):
-    return hosts(1)
-
-
-@pytest.fixture
-def hosts_two(hosts: Callable[[int], list[Host]]):
-    return hosts(2)
-
-
-@pytest.fixture
-def user_message():
-    """Override this fixture in tests to customize the message"""
-    return "Hello, how are you?"
-
-@pytest.fixture
-async def model_meta() -> ModelMetadata:
-    return await get_model_meta('mlx-community/Llama-3.2-1B-Instruct-4bit')
-
-
 @pytest.fixture
-def pipeline_shard_meta(model_meta: ModelMetadata, tmp_path: Path) -> Callable[[int, int], PipelineShardMetadata]:
+def pipeline_shard_meta(model_meta: ModelMetadata) -> Callable[[int, int], PipelineShardMetadata]:
     def _pipeline_shard_meta(
         num_nodes: int = 1, device_rank: int = 0
     ) -> PipelineShardMetadata:
@@ -90,6 +79,37 @@ def pipeline_shard_meta(model_meta: ModelMetadata, tmp_path: Path) -> Callable[[
 
     return _pipeline_shard_meta
 
+@pytest.fixture
+def instance(pipeline_shard_meta: Callable[[int, int], PipelineShardMetadata], hosts: Callable[[int], list[Host]]):
+    from typing import Optional
+
+    def _instance(
+        instance_id: Optional[InstanceId] = None,
+        node_id: Optional[NodeId] = None,
+        runner_id: Optional[RunnerId] = None,
+        model_id: Optional[ModelId] = None,
+    ) -> Instance:
+        resolved_instance_id = instance_id if instance_id is not None else INSTANCE_1_ID
+        resolved_node_id = node_id if node_id is not None else NODE_A
+        resolved_runner_id = runner_id if runner_id is not None else RUNNER_1_ID
+        resolved_model_id = model_id if model_id is not None else MODEL_A_ID
+
+        shard_assignments = ShardAssignments(
+            model_id=resolved_model_id,
+            runner_to_shard={
+                resolved_runner_id: pipeline_shard_meta(1, 0)
+            },
+            node_to_runner={resolved_node_id: resolved_runner_id}
+        )
+
+        return Instance(
+            instance_id=resolved_instance_id,
+            instance_type=InstanceStatus.ACTIVE,
+            shard_assignments=shard_assignments,
+            hosts=hosts(1)
+        )
+    return _instance
+
 @pytest.fixture
 def completion_create_params(user_message: str) -> ChatCompletionTaskParams:
     """Creates ChatCompletionParams with the given message"""
@@ -101,10 +121,14 @@ def completion_create_params(user_message: str) -> ChatCompletionTaskParams:
 
 @pytest.fixture
 def chat_completion_task(completion_create_params: ChatCompletionTaskParams):
-    def _chat_completion_task(instance_id: InstanceId, task_id: TaskId) -> ChatCompletionTask:
+    def _chat_completion_task(instance_id: Optional[InstanceId] = None, task_id: Optional[TaskId] = None) -> ChatCompletionTask:
+        if instance_id is None:
+            instance_id = INSTANCE_1_ID
+        if task_id is None:
+            task_id = TASK_1_ID
         return ChatCompletionTask(
             task_id=task_id,
-            command_id=CommandId(),
+            command_id=COMMAND_1_ID,
             instance_id=instance_id,
             task_type=TaskType.CHAT_COMPLETION,
             task_status=TaskStatus.PENDING,
@@ -112,105 +136,4 @@ def chat_completion_task(completion_create_params: ChatCompletionTaskParams):
         )
     return _chat_completion_task
 
-@pytest.fixture
-def node_id() -> NodeId:
-    """Shared node ID for tests"""
-    return NodeId()
-
-@pytest.fixture
-def state(node_id: NodeId):
-    node_status={
-        node_id: NodeStatus.Idle
-    }
-
-    return State(
-        node_status=node_status,
-    )
-
-@pytest.fixture
-def logger() -> Logger:
-    return getLogger("test_logger")
-
-@pytest.fixture
-def instance(pipeline_shard_meta: Callable[[int, int], PipelineShardMetadata], hosts_one: list[Host]):
-    def _instance(instance_id: InstanceId, node_id: NodeId, runner_id: RunnerId) -> Instance:
-        model_id = ModelId('mlx-community/Llama-3.2-1B-Instruct-4bit')
-
-        shard_assignments = ShardAssignments(
-            model_id=model_id,
-            runner_to_shard={
-                runner_id: pipeline_shard_meta(1, 0)
-            },
-            node_to_runner={node_id: runner_id}
-        )
-        
-        return Instance(
-            instance_id=instance_id,
-            instance_type=InstanceStatus.ACTIVE,
-            shard_assignments=shard_assignments,
-            hosts=hosts_one
-        )
-    return _instance
-
-@pytest.fixture
-async def worker(node_id: NodeId, logger: Logger):
-    event_log_manager = EventLogManager(EventLogConfig(), logger)
-    shard_downloader = NoopShardDownloader()
-    await event_log_manager.initialize()
-
-    return Worker(node_id, logger, shard_downloader, worker_events=event_log_manager.global_events, global_events=event_log_manager.global_events)
-
-@pytest.fixture
-async def worker_with_assigned_runner(worker: Worker, instance: Callable[[InstanceId, NodeId, RunnerId], Instance]):
-    """Fixture that provides a worker with an already assigned runner."""
-    
-    instance_obj: Instance = instance(InstanceId(), worker.node_id, RunnerId())
-    
-    # Extract runner_id from shard assignments
-    runner_id = next(iter(instance_obj.shard_assignments.runner_to_shard))
-    
-    # Assign the runner
-    assign_op = AssignRunnerOp(
-        runner_id=runner_id,
-        shard_metadata=instance_obj.shard_assignments.runner_to_shard[runner_id],
-        hosts=instance_obj.hosts,
-        instance_id=instance_obj.instance_id,
-    )
-    
-    async for _ in worker._execute_op(assign_op):  # type: ignore[misc]
-        pass
-    
-    return worker, runner_id, instance_obj
-
-@pytest.fixture
-async def worker_with_running_runner(worker_with_assigned_runner: tuple[Worker, RunnerId, Instance]):
-    """Fixture that provides a worker with an already assigned runner."""
-    worker, runner_id, instance_obj = worker_with_assigned_runner
-
-    runner_up_op = RunnerUpOp(runner_id=runner_id)
-    async for _ in worker._execute_op(runner_up_op):  # type: ignore[misc]
-        pass
-
-    # Is the runner actually running?
-    supervisor = next(iter(worker.assigned_runners.values())).runner
-    assert supervisor is not None
-    assert supervisor.healthy
-
-    return worker, runner_id, instance_obj
-
-@pytest.fixture
-def worker_running(logger: Logger) -> Callable[[NodeId], Awaitable[tuple[Worker, AsyncSQLiteEventStorage]]]:
-    async def _worker_running(node_id: NodeId) -> tuple[Worker, AsyncSQLiteEventStorage]:
-        event_log_manager = EventLogManager(EventLogConfig(), logger)
-        await event_log_manager.initialize()
-
-        global_events = event_log_manager.global_events
-        await global_events.delete_all_events()
-
-        shard_downloader = NoopShardDownloader()
-        worker = Worker(node_id, logger=logger, shard_downloader=shard_downloader, worker_events=global_events, global_events=global_events)
-        asyncio.create_task(worker.run())
-
-        return worker, global_events
 
-    return _worker_running
\ No newline at end of file
diff --git a/worker/tests/constants.py b/worker/tests/constants.py
new file mode 100644
index 00000000..8e139a13
--- /dev/null
+++ b/worker/tests/constants.py
@@ -0,0 +1,26 @@
+from typing import Final
+
+from shared.types.common import CommandId, NodeId
+from shared.types.models import ModelId
+from shared.types.tasks import TaskId
+from shared.types.worker.common import InstanceId, RunnerId
+
+MASTER_NODE_ID = NodeId("ffffffff-aaaa-4aaa-8aaa-aaaaaaaaaaaa")
+
+NODE_A: Final[NodeId] = NodeId("aaaaaaaa-aaaa-4aaa-8aaa-aaaaaaaaaaaa")
+NODE_B: Final[NodeId] = NodeId("bbbbbbbb-bbbb-4bbb-8bbb-bbbbbbbbbbbb")
+
+RUNNER_1_ID: Final[RunnerId] = RunnerId("11111111-1111-4111-8111-111111111111")
+RUNNER_2_ID: Final[RunnerId] = RunnerId("33333333-3333-4333-8333-333333333333")
+
+INSTANCE_1_ID: Final[InstanceId] = InstanceId("22222222-2222-4222-8222-222222222222")
+INSTANCE_2_ID: Final[InstanceId] = InstanceId("44444444-4444-4444-8444-444444444444")
+
+MODEL_A_ID: Final[ModelId] = 'mlx-community/Llama-3.2-1B-Instruct-4bit'
+MODEL_B_ID: Final[ModelId] = 'mlx-community/TinyLlama-1.1B-Chat-v1.0'
+
+TASK_1_ID: Final[TaskId] = TaskId("55555555-5555-4555-8555-555555555555")
+TASK_2_ID: Final[TaskId] = TaskId("66666666-6666-4666-8666-666666666666")
+
+COMMAND_1_ID: Final[CommandId] = CommandId("77777777-7777-4777-8777-777777777777")
+COMMAND_2_ID: Final[CommandId] = CommandId("88888888-8888-4888-8888-888888888888")
\ No newline at end of file
diff --git a/worker/tests/test_download.py b/worker/tests/test_download.py
index a201f528..c44d6e65 100644
--- a/worker/tests/test_download.py
+++ b/worker/tests/test_download.py
@@ -8,6 +8,7 @@ from worker.download.impl_shard_downloader import exo_shard_downloader
 from worker.download.shard_downloader import ShardDownloader
 
 
+@pytest.mark.slow
 @pytest.mark.asyncio
 async def test_shard_downloader(pipeline_shard_meta: Callable[[int, int], PipelineShardMetadata]):
     shard_downloader: ShardDownloader = exo_shard_downloader()
diff --git a/worker/tests/test_handlers/conftest.py b/worker/tests/test_handlers/conftest.py
new file mode 100644
index 00000000..9f7801c6
--- /dev/null
+++ b/worker/tests/test_handlers/conftest.py
@@ -0,0 +1,70 @@
+from logging import Logger
+from typing import Callable
+
+import pytest
+
+from shared.db.sqlite.event_log_manager import EventLogConfig, EventLogManager
+from shared.types.common import NodeId
+from shared.types.worker.common import InstanceId
+from shared.types.worker.instances import Instance
+from shared.types.worker.ops import (
+    AssignRunnerOp,
+    RunnerUpOp,
+)
+from shared.types.worker.runners import RunnerId
+from worker.download.shard_downloader import NoopShardDownloader
+from worker.tests.constants import INSTANCE_1_ID, NODE_A, RUNNER_1_ID
+from worker.worker import Worker
+
+
+@pytest.fixture
+def user_message():
+    return "What, according to Douglas Adams, is the meaning of life, the universe and everything?"
+
+
+@pytest.fixture
+async def worker(logger: Logger):
+    event_log_manager = EventLogManager(EventLogConfig(), logger)
+    shard_downloader = NoopShardDownloader()
+    await event_log_manager.initialize()
+
+    return Worker(NODE_A, logger, shard_downloader, worker_events=event_log_manager.global_events, global_events=event_log_manager.global_events)
+
+# TODO: instance_id and runner_id are selectable.
+@pytest.fixture
+async def worker_with_assigned_runner(worker: Worker, instance: Callable[[InstanceId, NodeId, RunnerId], Instance]):
+    """Fixture that provides a worker with an already assigned runner."""
+    
+    instance_id = INSTANCE_1_ID
+    runner_id = RUNNER_1_ID
+    instance_obj: Instance = instance(instance_id, worker.node_id, runner_id)
+    
+    # Assign the runner
+    assign_op = AssignRunnerOp(
+        runner_id=runner_id,
+        shard_metadata=instance_obj.shard_assignments.runner_to_shard[runner_id],
+        hosts=instance_obj.hosts,
+        instance_id=instance_obj.instance_id,
+    )
+    
+    async for _ in worker.execute_op(assign_op):
+        pass
+    
+    return worker, instance_obj
+
+@pytest.fixture
+async def worker_with_running_runner(worker_with_assigned_runner: tuple[Worker, Instance]):
+    """Fixture that provides a worker with an already assigned runner."""
+    worker, instance_obj = worker_with_assigned_runner
+
+    runner_up_op = RunnerUpOp(runner_id=RUNNER_1_ID)
+    async for _ in worker.execute_op(runner_up_op):
+        pass
+
+    # Is the runner actually running?
+    supervisor = next(iter(worker.assigned_runners.values())).runner
+    assert supervisor is not None
+    assert supervisor.healthy
+
+    return worker, instance_obj
+
diff --git a/worker/tests/test_handlers/test_handlers_happy.py b/worker/tests/test_handlers/test_handlers_happy.py
new file mode 100644
index 00000000..5d2dc0b8
--- /dev/null
+++ b/worker/tests/test_handlers/test_handlers_happy.py
@@ -0,0 +1,159 @@
+from typing import Callable
+
+import pytest
+
+from shared.types.common import NodeId
+from shared.types.events import (
+    ChunkGenerated,
+    RunnerDeleted,
+    RunnerStatusUpdated,
+    TaskStateUpdated,
+)
+from shared.types.events.chunks import TokenChunk
+from shared.types.tasks import ChatCompletionTask, TaskStatus
+from shared.types.worker.common import RunnerId
+from shared.types.worker.instances import Instance, InstanceId
+from shared.types.worker.ops import (
+    AssignRunnerOp,
+    ExecuteTaskOp,
+    RunnerDownOp,
+    RunnerUpOp,
+    UnassignRunnerOp,
+)
+from shared.types.worker.runners import (
+    DownloadingRunnerStatus,
+    InactiveRunnerStatus,
+    LoadedRunnerStatus,
+    RunningRunnerStatus,
+)
+from worker.main import Worker
+from worker.tests.constants import (
+    RUNNER_1_ID,
+)
+from worker.tests.test_handlers.utils import read_events_op
+
+
+@pytest.mark.asyncio
+async def test_assign_op(worker: Worker, instance: Callable[[InstanceId, NodeId, RunnerId], Instance]):
+    instance_obj: Instance = instance(InstanceId(), worker.node_id, RUNNER_1_ID)
+
+    assign_op = AssignRunnerOp(
+        runner_id=RUNNER_1_ID,
+        shard_metadata=instance_obj.shard_assignments.runner_to_shard[RUNNER_1_ID],
+        hosts=instance_obj.hosts,
+        instance_id=instance_obj.instance_id,
+    )
+
+    events = await read_events_op(worker, assign_op)
+
+    # We should have a status update saying 'starting'.
+    assert len(events) == 2
+    assert isinstance(events[0], RunnerStatusUpdated)
+    assert isinstance(events[0].runner_status, DownloadingRunnerStatus)
+    assert isinstance(events[1], RunnerStatusUpdated)
+    assert isinstance(events[1].runner_status, InactiveRunnerStatus)
+
+    # And the runner should be assigned
+    assert RUNNER_1_ID in worker.assigned_runners
+    assert isinstance(worker.assigned_runners[RUNNER_1_ID].status, InactiveRunnerStatus)
+
+@pytest.mark.asyncio
+async def test_unassign_op(worker_with_assigned_runner: tuple[Worker, Instance]):
+    worker, _ = worker_with_assigned_runner
+
+    unassign_op = UnassignRunnerOp(
+        runner_id=RUNNER_1_ID
+    )
+
+    events = await read_events_op(worker, unassign_op)
+
+    # We should have no assigned runners and no events were emitted
+    assert len(worker.assigned_runners) == 0
+    assert len(events) == 1
+    assert isinstance(events[0], RunnerDeleted)
+
+@pytest.mark.asyncio
+async def test_runner_up_op(
+    worker_with_assigned_runner: tuple[Worker, Instance], 
+    chat_completion_task: Callable[[], ChatCompletionTask], 
+    ):
+    worker, _ = worker_with_assigned_runner
+
+    runner_up_op = RunnerUpOp(runner_id=RUNNER_1_ID)
+
+    events = await read_events_op(worker, runner_up_op)
+
+    assert len(events) == 1
+    assert isinstance(events[0], RunnerStatusUpdated)
+    assert isinstance(events[0].runner_status, LoadedRunnerStatus)
+
+    # Is the runner actually running?
+    supervisor = next(iter(worker.assigned_runners.values())).runner
+    assert supervisor is not None
+    assert supervisor.healthy
+
+    full_response = ''
+
+    async for chunk in supervisor.stream_response(task=chat_completion_task()):
+        if isinstance(chunk, TokenChunk):
+            full_response += chunk.text
+
+    assert "42" in full_response.lower(), (
+        f"Expected '42' in response, but got: {full_response}"
+    )
+
+    runner = worker.assigned_runners[RUNNER_1_ID].runner
+    assert runner is not None
+    await runner.astop() # Neat cleanup.
+
+@pytest.mark.asyncio
+async def test_runner_down_op(worker_with_running_runner: tuple[Worker, Instance]):
+    worker, _ = worker_with_running_runner
+
+    runner_down_op = RunnerDownOp(runner_id=RUNNER_1_ID)
+    events = await read_events_op(worker, runner_down_op)
+
+    assert len(events) == 1
+    assert isinstance(events[0], RunnerStatusUpdated)
+    assert isinstance(events[0].runner_status, InactiveRunnerStatus)
+
+@pytest.mark.asyncio
+async def test_execute_task_op(
+    worker_with_running_runner: tuple[Worker, Instance], 
+    chat_completion_task: Callable[[], ChatCompletionTask]):
+    worker, _ = worker_with_running_runner
+
+    execute_task_op = ExecuteTaskOp(
+        runner_id=RUNNER_1_ID,
+        task=chat_completion_task()
+    )
+
+    events = await read_events_op(worker, execute_task_op)
+
+    assert len(events) > 20
+
+    print(f'{events=}')    
+
+
+    assert isinstance(events[0], RunnerStatusUpdated)
+    assert isinstance(events[0].runner_status, RunningRunnerStatus)
+
+    assert isinstance(events[1], TaskStateUpdated)
+    assert events[1].task_status == TaskStatus.RUNNING # It tried to start.
+
+    assert isinstance(events[-2], TaskStateUpdated)
+    assert events[-2].task_status == TaskStatus.COMPLETE # It tried to start.
+
+    assert isinstance(events[-1], RunnerStatusUpdated)
+    assert isinstance(events[-1].runner_status, LoadedRunnerStatus) # It should not have failed.
+
+    gen_events: list[ChunkGenerated] = [x for x in events if isinstance(x, ChunkGenerated)]
+    text_chunks: list[TokenChunk] = [x.chunk for x in gen_events if isinstance(x.chunk, TokenChunk)]
+    assert len(text_chunks) == len(events) - 4
+    
+    output_text = ''.join([x.text for x in text_chunks])
+    assert '42' in output_text
+
+    runner = worker.assigned_runners[RUNNER_1_ID].runner
+    assert runner is not None
+    await runner.astop() # Neat cleanup.
diff --git a/worker/tests/test_handlers/test_handlers_sad.py b/worker/tests/test_handlers/test_handlers_sad.py
new file mode 100644
index 00000000..05238c8e
--- /dev/null
+++ b/worker/tests/test_handlers/test_handlers_sad.py
@@ -0,0 +1,61 @@
+## Tests for worker state handlers
+
+from typing import Callable
+
+import pytest
+
+from shared.types.events import (
+    RunnerStatusUpdated,
+    TaskFailed,
+    TaskStateUpdated,
+)
+from shared.types.tasks import ChatCompletionTask, TaskStatus
+from shared.types.worker.instances import Instance
+from shared.types.worker.ops import (
+    ExecuteTaskOp,
+)
+from shared.types.worker.runners import (
+    FailedRunnerStatus,
+    RunningRunnerStatus,
+)
+from worker.main import Worker
+from worker.tests.constants import RUNNER_1_ID
+from worker.tests.test_handlers.utils import read_events_op
+
+
+@pytest.mark.asyncio
+async def test_execute_task_fails(
+    worker_with_running_runner: tuple[Worker, Instance], 
+    chat_completion_task: Callable[[], ChatCompletionTask]):
+    worker, _ = worker_with_running_runner
+
+    task = chat_completion_task()
+    messages = task.task_params.messages
+    messages[0].content = 'Artificial prompt: EXO RUNNER MUST FAIL'
+
+    execute_task_op = ExecuteTaskOp(
+        runner_id=RUNNER_1_ID,
+        task=task
+    )
+
+    events = await read_events_op(worker, execute_task_op)
+
+    assert len(events) == 5
+
+    print(events)    
+
+    assert isinstance(events[0], RunnerStatusUpdated)
+    assert isinstance(events[0].runner_status, RunningRunnerStatus) # It tried to start.
+
+    assert isinstance(events[1], TaskStateUpdated)
+    assert events[1].task_status == TaskStatus.RUNNING # It tried to start.
+
+    assert isinstance(events[2], TaskStateUpdated)
+    assert events[2].task_status == TaskStatus.FAILED # Task marked as failed. 
+
+    assert isinstance(events[3], TaskFailed)
+
+    assert isinstance(events[4], RunnerStatusUpdated)
+    assert isinstance(events[4].runner_status, FailedRunnerStatus) # It should have failed.
+
+# TODO: Much more to do here!
\ No newline at end of file
diff --git a/worker/tests/test_handlers/utils.py b/worker/tests/test_handlers/utils.py
new file mode 100644
index 00000000..8e97949b
--- /dev/null
+++ b/worker/tests/test_handlers/utils.py
@@ -0,0 +1,18 @@
+## Tests for worker state handlers
+
+
+
+from shared.types.events import (
+    Event,
+)
+from shared.types.worker.ops import (
+    RunnerOp,
+)
+from worker.main import Worker
+
+
+async def read_events_op(worker: Worker, op: RunnerOp) -> list[Event]:
+    events: list[Event] = []
+    async for event in worker.execute_op(op):
+        events.append(event)
+    return events
\ No newline at end of file
diff --git a/worker/tests/test_integration/conftest.py b/worker/tests/test_integration/conftest.py
new file mode 100644
index 00000000..8e3faa39
--- /dev/null
+++ b/worker/tests/test_integration/conftest.py
@@ -0,0 +1,36 @@
+import asyncio
+from logging import Logger
+from typing import Awaitable, Callable
+
+import pytest
+
+from shared.db.sqlite.connector import AsyncSQLiteEventStorage
+from shared.db.sqlite.event_log_manager import EventLogConfig, EventLogManager
+from shared.types.common import NodeId
+from worker.download.shard_downloader import NoopShardDownloader
+from worker.main import run
+from worker.worker import Worker
+
+
+@pytest.fixture
+def user_message():
+    """Override this fixture in tests to customize the message"""
+    return "What is the capital of Japan?"
+
+
+@pytest.fixture
+def worker_running(logger: Logger) -> Callable[[NodeId], Awaitable[tuple[Worker, AsyncSQLiteEventStorage]]]:
+    async def _worker_running(node_id: NodeId) -> tuple[Worker, AsyncSQLiteEventStorage]:
+        event_log_manager = EventLogManager(EventLogConfig(), logger)
+        await event_log_manager.initialize()
+
+        global_events = event_log_manager.global_events
+        await global_events.delete_all_events()
+
+        shard_downloader = NoopShardDownloader()
+        worker = Worker(node_id, logger=logger, shard_downloader=shard_downloader, worker_events=global_events, global_events=global_events)
+        asyncio.create_task(run(worker))
+
+        return worker, global_events
+
+    return _worker_running
\ No newline at end of file
diff --git a/worker/tests/test_worker_integration_utils.py b/worker/tests/test_integration/integration_utils.py
similarity index 100%
rename from worker/tests/test_worker_integration_utils.py
rename to worker/tests/test_integration/integration_utils.py
diff --git a/worker/tests/test_worker_integration.py b/worker/tests/test_integration/test_creation.py
similarity index 53%
rename from worker/tests/test_worker_integration.py
rename to worker/tests/test_integration/test_creation.py
index 99f8ed05..4e13a18b 100644
--- a/worker/tests/test_worker_integration.py
+++ b/worker/tests/test_integration/test_creation.py
@@ -1,14 +1,11 @@
 import asyncio
 from logging import Logger
-from typing import Awaitable, Callable, Final
-
-import pytest
+from typing import Awaitable, Callable
 
 # TaskStateUpdated and ChunkGenerated are used in test_worker_integration_utils.py
 from shared.db.sqlite.connector import AsyncSQLiteEventStorage
 from shared.db.sqlite.event_log_manager import EventLogConfig, EventLogManager
-from shared.types.api import ChatCompletionMessage, ChatCompletionTaskParams
-from shared.types.common import CommandId, Host, NodeId
+from shared.types.common import Host, NodeId
 from shared.types.events import (
     InstanceCreated,
     InstanceDeleted,
@@ -18,7 +15,7 @@ from shared.types.events import (
 )
 from shared.types.events.chunks import TokenChunk
 from shared.types.models import ModelId
-from shared.types.tasks import ChatCompletionTask, Task, TaskId, TaskStatus, TaskType
+from shared.types.tasks import Task, TaskId
 from shared.types.worker.common import InstanceId, RunnerId
 from shared.types.worker.instances import (
     Instance,
@@ -26,35 +23,31 @@ from shared.types.worker.instances import (
     ShardAssignments,
 )
 from shared.types.worker.runners import (
-    AssignedRunnerStatus,
     DownloadingRunnerStatus,
     # RunningRunnerStatus,
     FailedRunnerStatus,
+    InactiveRunnerStatus,
     LoadedRunnerStatus,
-    ReadyRunnerStatus,
 )
 from shared.types.worker.shards import PipelineShardMetadata
+from worker.common import AssignedRunner
 from worker.download.shard_downloader import NoopShardDownloader
-from worker.main import AssignedRunner, Worker
-from worker.tests.test_worker_integration_utils import read_streaming_response
-
-MASTER_NODE_ID = NodeId("ffffffff-aaaa-4aaa-8aaa-aaaaaaaaaaaa")
-NODE_A: Final[NodeId] = NodeId("aaaaaaaa-aaaa-4aaa-8aaa-aaaaaaaaaaaa")
-NODE_B: Final[NodeId] = NodeId("bbbbbbbb-bbbb-4bbb-8bbb-bbbbbbbbbbbb")
-
-# Define constant IDs for deterministic test cases
-RUNNER_1_ID: Final[RunnerId] = RunnerId("11111111-1111-4111-8111-111111111111")
-INSTANCE_1_ID: Final[InstanceId] = InstanceId("22222222-2222-4222-8222-222222222222")
-RUNNER_2_ID: Final[RunnerId] = RunnerId("33333333-3333-4333-8333-333333333333")
-INSTANCE_2_ID: Final[InstanceId] = InstanceId("44444444-4444-4444-8444-444444444444")
-MODEL_A_ID: Final[ModelId] = 'mlx-community/Llama-3.2-1B-Instruct-4bit'
-MODEL_B_ID: Final[ModelId] = 'mlx-community/Llama-3.2-1B-Instruct-4bit'
-TASK_1_ID: Final[TaskId] = TaskId("55555555-5555-4555-8555-555555555555")
-TASK_2_ID: Final[TaskId] = TaskId("66666666-6666-4666-8666-666666666666")
-
-@pytest.fixture
-def user_message():
-    return "What is the capital of Japan?"
+from worker.main import run
+from worker.tests.constants import (
+    INSTANCE_1_ID,
+    MASTER_NODE_ID,
+    NODE_A,
+    NODE_B,
+    RUNNER_1_ID,
+    RUNNER_2_ID,
+    TASK_1_ID,
+    TASK_2_ID,
+)
+from worker.tests.test_integration.integration_utils import (
+    read_streaming_response,
+)
+from worker.worker import Worker
+
 
 async def test_runner_assigned(
     worker_running: Callable[[NodeId], Awaitable[tuple[Worker, AsyncSQLiteEventStorage]]], 
@@ -63,8 +56,6 @@ async def test_runner_assigned(
 
     worker, global_events = await worker_running(NODE_A)
 
-    print(worker)
-
     instance_value: Instance = instance(INSTANCE_1_ID, NODE_A, RUNNER_1_ID)
     instance_value.instance_type = InstanceStatus.INACTIVE
 
@@ -82,22 +73,19 @@ async def test_runner_assigned(
     # Ensure the worker has taken the correct action
     assert len(worker.assigned_runners) == 1
     assert RUNNER_1_ID in worker.assigned_runners
-    assert isinstance(worker.assigned_runners[RUNNER_1_ID].status, ReadyRunnerStatus)
+    assert isinstance(worker.assigned_runners[RUNNER_1_ID].status, InactiveRunnerStatus)
 
     # Ensure the correct events have been emitted
     events = await global_events.get_events_since(0)
-    print(events)
-    assert len(events) >= 4 # len(events) is 4 if it's already downloaded. It is > 4 if there have to be download events.
+    assert len(events) >= 3 # len(events) is 4 if it's already downloaded. It is > 4 if there have to be download events.
 
     assert isinstance(events[1].event, RunnerStatusUpdated)
-    assert isinstance(events[1].event.runner_status, AssignedRunnerStatus)
-    assert isinstance(events[2].event, RunnerStatusUpdated)
-    assert isinstance(events[2].event.runner_status, DownloadingRunnerStatus)
+    assert isinstance(events[1].event.runner_status, DownloadingRunnerStatus)
     assert isinstance(events[-1].event, RunnerStatusUpdated)
-    assert isinstance(events[-1].event.runner_status, ReadyRunnerStatus)
+    assert isinstance(events[-1].event.runner_status, InactiveRunnerStatus)
 
     # Ensure state is correct
-    assert isinstance(worker.state.runners[RUNNER_1_ID], ReadyRunnerStatus)
+    assert isinstance(worker.state.runners[RUNNER_1_ID], InactiveRunnerStatus)
 
 async def test_runner_assigned_active(
     worker_running: Callable[[NodeId], Awaitable[tuple[Worker, AsyncSQLiteEventStorage]]],
@@ -118,7 +106,7 @@ async def test_runner_assigned_active(
         origin=MASTER_NODE_ID
     )
 
-    await asyncio.sleep(1.0)
+    await asyncio.sleep(2.0)
 
     assert len(worker.assigned_runners) == 1
     assert RUNNER_1_ID in worker.assigned_runners
@@ -126,13 +114,11 @@ async def test_runner_assigned_active(
 
     # Ensure the correct events have been emitted
     events = await global_events.get_events_since(0)
-    assert len(events) >= 5 # len(events) is 5 if it's already downloaded. It is > 5 if there have to be download events.
+    assert len(events) >= 4 # len(events) is 5 if it's already downloaded. It is > 5 if there have to be download events.
     assert isinstance(events[1].event, RunnerStatusUpdated)
-    assert isinstance(events[1].event.runner_status, AssignedRunnerStatus)
-    assert isinstance(events[2].event, RunnerStatusUpdated)
-    assert isinstance(events[2].event.runner_status, DownloadingRunnerStatus)
+    assert isinstance(events[1].event.runner_status, DownloadingRunnerStatus)
     assert isinstance(events[-2].event, RunnerStatusUpdated)
-    assert isinstance(events[-2].event.runner_status, ReadyRunnerStatus)
+    assert isinstance(events[-2].event.runner_status, InactiveRunnerStatus)
     assert isinstance(events[-1].event, RunnerStatusUpdated)
     assert isinstance(events[-1].event.runner_status, LoadedRunnerStatus)
 
@@ -201,7 +187,7 @@ async def test_runner_unassigns(
         origin=MASTER_NODE_ID
     )
 
-    await asyncio.sleep(0.5)
+    await asyncio.sleep(2.0)
 
     # already tested by test_runner_assigned_active
     assert len(worker.assigned_runners) == 1
@@ -210,12 +196,11 @@ async def test_runner_unassigns(
 
     # Ensure the correct events have been emitted (creation)
     events = await global_events.get_events_since(0)
-    assert len(events) >= 5
+    assert len(events) >= 4
     assert isinstance(events[-1].event, RunnerStatusUpdated)
     assert isinstance(events[-1].event.runner_status, LoadedRunnerStatus)
 
     # Ensure state is correct
-    print(worker.state)
     assert isinstance(worker.state.runners[RUNNER_1_ID], LoadedRunnerStatus)
 
     await global_events.append_events(
@@ -227,7 +212,6 @@ async def test_runner_unassigns(
 
     await asyncio.sleep(0.3)
 
-    print(worker.state)
     assert len(worker.assigned_runners) == 0
 
     # Ensure the correct events have been emitted (deletion)
@@ -236,221 +220,6 @@ async def test_runner_unassigns(
     # After deletion, runner should be removed from state.runners
     assert len(worker.state.runners) == 0
 
-async def test_runner_inference(
-    worker_running: Callable[[NodeId], Awaitable[tuple[Worker, AsyncSQLiteEventStorage]]],
-    instance: Callable[[InstanceId, NodeId, RunnerId], Instance],
-    chat_completion_task: Callable[[InstanceId, TaskId], Task]
-    ):
-    _worker, global_events = await worker_running(NODE_A)
-
-    instance_value: Instance = instance(INSTANCE_1_ID, NODE_A, RUNNER_1_ID)
-    instance_value.instance_type = InstanceStatus.ACTIVE
-
-    task: Task = chat_completion_task(INSTANCE_1_ID, TASK_1_ID)
-    await global_events.append_events(
-        [
-            InstanceCreated(
-                instance=instance_value,
-            ),
-            TaskCreated(
-                task_id=task.task_id,
-                task=task
-            )
-        ], 
-        origin=MASTER_NODE_ID
-    )
-    
-    seen_task_started, seen_task_finished, response_string = await read_streaming_response(global_events)
-
-    assert seen_task_started
-    assert seen_task_finished
-    assert 'tokyo' in response_string.lower()
-
-    await global_events.append_events(
-        [
-            InstanceDeleted(
-                instance_id=instance_value.instance_id,
-            ),
-        ], 
-        origin=MASTER_NODE_ID
-    )
-
-    await asyncio.sleep(0.3)
-
-async def test_2_runner_inference(
-    logger: Logger,
-    pipeline_shard_meta: Callable[[int, int], PipelineShardMetadata],
-    hosts: Callable[[int], list[Host]],
-    chat_completion_task: Callable[[InstanceId, TaskId], Task]
-    ):
-    event_log_manager = EventLogManager(EventLogConfig(), logger)
-    await event_log_manager.initialize()
-    shard_downloader = NoopShardDownloader()
-
-    global_events = event_log_manager.global_events
-    await global_events.delete_all_events()
-
-    worker1 = Worker(NODE_A, logger=logger, shard_downloader=shard_downloader, worker_events=global_events, global_events=global_events)
-    asyncio.create_task(worker1.run())
-
-    worker2 = Worker(NODE_B, logger=logger, shard_downloader=shard_downloader, worker_events=global_events, global_events=global_events)
-    asyncio.create_task(worker2.run())
-
-    ## Instance
-    model_id = ModelId('mlx-community/Llama-3.2-1B-Instruct-4bit')
-
-    shard_assignments = ShardAssignments(
-        model_id=model_id,
-        runner_to_shard={
-            RUNNER_1_ID: pipeline_shard_meta(2, 0),
-            RUNNER_2_ID: pipeline_shard_meta(2, 1)
-        },
-        node_to_runner={
-            NODE_A: RUNNER_1_ID,
-            NODE_B: RUNNER_2_ID
-        }
-    )
-    
-    instance = Instance(
-        instance_id=INSTANCE_1_ID,
-        instance_type=InstanceStatus.ACTIVE,
-        shard_assignments=shard_assignments,
-        hosts=hosts(2)
-    )
-
-    task = chat_completion_task(INSTANCE_1_ID, TASK_1_ID)
-    await global_events.append_events(
-        [
-            InstanceCreated(
-                instance=instance
-            ),
-            TaskCreated(
-                task_id=task.task_id,
-                task=task
-            )
-        ], 
-        origin=MASTER_NODE_ID
-    )
-
-    seen_task_started, seen_task_finished, response_string = await read_streaming_response(global_events)    
-
-    assert seen_task_started
-    assert seen_task_finished
-    assert 'tokyo' in response_string.lower()
-
-
-    idx = await global_events.get_last_idx()
-    await asyncio.sleep(1.0)
-    events = await global_events.get_events_since(idx)
-    assert len(events) == 0
-
-    await global_events.append_events(
-        [
-            InstanceDeleted(
-                instance_id=instance.instance_id,
-            ),
-        ], 
-        origin=MASTER_NODE_ID
-    )
-
-    await asyncio.sleep(2.0)
-
-async def test_2_runner_multi_message(
-    logger: Logger,
-    pipeline_shard_meta: Callable[[int, int], PipelineShardMetadata],
-    hosts: Callable[[int], list[Host]],
-    ):
-    event_log_manager = EventLogManager(EventLogConfig(), logger)
-    await event_log_manager.initialize()
-    shard_downloader = NoopShardDownloader()
-
-    global_events = event_log_manager.global_events
-    await global_events.delete_all_events()
-
-    worker1 = Worker(NODE_A, logger=logger, shard_downloader=shard_downloader, worker_events=global_events, global_events=global_events)
-    asyncio.create_task(worker1.run())
-
-    worker2 = Worker(NODE_B, logger=logger, shard_downloader=shard_downloader, worker_events=global_events, global_events=global_events)
-    asyncio.create_task(worker2.run())
-
-    ## Instance
-    model_id = ModelId('mlx-community/Llama-3.2-1B-Instruct-4bit')
-
-    shard_assignments = ShardAssignments(
-        model_id=model_id,
-        runner_to_shard={
-            RUNNER_1_ID: pipeline_shard_meta(2, 0),
-            RUNNER_2_ID: pipeline_shard_meta(2, 1)
-        },
-        node_to_runner={
-            NODE_A: RUNNER_1_ID,
-            NODE_B: RUNNER_2_ID
-        }
-    )
-    
-    instance = Instance(
-        instance_id=INSTANCE_1_ID,
-        instance_type=InstanceStatus.ACTIVE,
-        shard_assignments=shard_assignments,
-        hosts=hosts(2)
-    )
-
-    # Task - we have three messages here, which is what the task is about
-
-    completion_create_params = ChatCompletionTaskParams(
-        model="gpt-4",
-        messages=[
-            ChatCompletionMessage(role="user", content='What is the capital of France?'),
-            ChatCompletionMessage(role="assistant", content='The capital of France is Paris.'),
-            ChatCompletionMessage(role="user", content='Ok great. Now write me a haiku about what you can do there.'),
-        ],
-        stream=True,
-    )
-
-    task = ChatCompletionTask(
-        task_id=TASK_1_ID,
-        command_id=CommandId(),
-        instance_id=INSTANCE_1_ID,
-        task_type=TaskType.CHAT_COMPLETION,
-        task_status=TaskStatus.PENDING,
-        task_params=completion_create_params
-    )
-
-    await global_events.append_events(
-        [
-            InstanceCreated(
-                instance=instance
-            ),
-            TaskCreated(
-                task_id=task.task_id,
-                task=task
-            )
-        ], 
-        origin=MASTER_NODE_ID
-    )
-
-    seen_task_started, seen_task_finished, response_string = await read_streaming_response(global_events)    
-
-    assert seen_task_started
-    assert seen_task_finished
-    assert any(keyword in response_string.lower() for keyword in ('kiss', 'paris', 'art', 'love'))
-
-
-    idx = await global_events.get_last_idx()
-    await asyncio.sleep(1.0)
-    events = await global_events.get_events_since(idx)
-    assert len(events) == 0
-
-    await global_events.append_events(
-        [
-            InstanceDeleted(
-                instance_id=instance.instance_id,
-            ),
-        ], 
-        origin=MASTER_NODE_ID
-    )
-
-    await asyncio.sleep(2.0)
 
 
 async def test_runner_respawn(
@@ -467,10 +236,10 @@ async def test_runner_respawn(
     await global_events.delete_all_events()
 
     worker1 = Worker(NODE_A, logger=logger, shard_downloader=shard_downloader, worker_events=global_events, global_events=global_events)
-    asyncio.create_task(worker1.run())
+    asyncio.create_task(run(worker1))
 
     worker2 = Worker(NODE_B, logger=logger, shard_downloader=shard_downloader, worker_events=global_events, global_events=global_events)
-    asyncio.create_task(worker2.run())
+    asyncio.create_task(run(worker2))
 
     ## Instance
     model_id = ModelId('mlx-community/Llama-3.2-1B-Instruct-4bit')
@@ -534,21 +303,18 @@ async def test_runner_respawn(
     await asyncio.sleep(5.0)
 
     events = await global_events.get_events_since(idx)
-    print(f'{events=}')
     # assert len(events) == 2
     assert isinstance(events[0].event, RunnerStatusUpdated)
     assert isinstance(events[0].event.runner_status, FailedRunnerStatus)
 
     assert isinstance(events[1].event, RunnerStatusUpdated)
-    assert isinstance(events[1].event.runner_status, ReadyRunnerStatus)
+    assert isinstance(events[1].event.runner_status, InactiveRunnerStatus)
     assert events[1].event.runner_id == RUNNER_2_ID
 
     assert isinstance(events[2].event, RunnerStatusUpdated)
-    assert isinstance(events[2].event.runner_status, ReadyRunnerStatus)
+    assert isinstance(events[2].event.runner_status, InactiveRunnerStatus)
     assert events[2].event.runner_id == RUNNER_1_ID
 
-    print(worker1.state)
-    print(worker2.state)
 
     for event in [events[3].event, events[4].event]:
         assert isinstance(event, RunnerStatusUpdated)
diff --git a/worker/tests/test_integration/test_inference.py b/worker/tests/test_integration/test_inference.py
new file mode 100644
index 00000000..8b291db9
--- /dev/null
+++ b/worker/tests/test_integration/test_inference.py
@@ -0,0 +1,256 @@
+import asyncio
+from logging import Logger
+from typing import Awaitable, Callable
+
+# TaskStateUpdated and ChunkGenerated are used in test_worker_integration_utils.py
+from shared.db.sqlite.connector import AsyncSQLiteEventStorage
+from shared.db.sqlite.event_log_manager import EventLogConfig, EventLogManager
+from shared.types.api import ChatCompletionMessage, ChatCompletionTaskParams
+from shared.types.common import CommandId, Host, NodeId
+from shared.types.events import (
+    InstanceCreated,
+    InstanceDeleted,
+    TaskCreated,
+)
+from shared.types.models import ModelId
+from shared.types.tasks import ChatCompletionTask, Task, TaskId, TaskStatus, TaskType
+from shared.types.worker.common import InstanceId, RunnerId
+from shared.types.worker.instances import (
+    Instance,
+    InstanceStatus,
+    ShardAssignments,
+)
+from shared.types.worker.shards import PipelineShardMetadata
+from worker.download.shard_downloader import NoopShardDownloader
+from worker.main import run
+from worker.tests.constants import (
+    INSTANCE_1_ID,
+    MASTER_NODE_ID,
+    NODE_A,
+    NODE_B,
+    RUNNER_1_ID,
+    RUNNER_2_ID,
+    TASK_1_ID,
+)
+from worker.tests.test_integration.integration_utils import (
+    read_streaming_response,
+)
+from worker.worker import Worker
+
+
+async def test_runner_inference(
+    worker_running: Callable[[NodeId], Awaitable[tuple[Worker, AsyncSQLiteEventStorage]]],
+    instance: Callable[[InstanceId, NodeId, RunnerId], Instance],
+    chat_completion_task: Callable[[InstanceId, TaskId], Task]
+    ):
+    _worker, global_events = await worker_running(NODE_A)
+
+    instance_value: Instance = instance(INSTANCE_1_ID, NODE_A, RUNNER_1_ID)
+    instance_value.instance_type = InstanceStatus.ACTIVE
+
+    task: Task = chat_completion_task(INSTANCE_1_ID, TASK_1_ID)
+    await global_events.append_events(
+        [
+            InstanceCreated(
+                instance=instance_value,
+            ),
+            TaskCreated(
+                task_id=task.task_id,
+                task=task
+            )
+        ], 
+        origin=MASTER_NODE_ID
+    )
+    
+    seen_task_started, seen_task_finished, response_string = await read_streaming_response(global_events)
+
+    assert seen_task_started
+    assert seen_task_finished
+    assert 'tokyo' in response_string.lower()
+
+    await global_events.append_events(
+        [
+            InstanceDeleted(
+                instance_id=instance_value.instance_id,
+            ),
+        ], 
+        origin=MASTER_NODE_ID
+    )
+
+    await asyncio.sleep(0.3)
+
+async def test_2_runner_inference(
+    logger: Logger,
+    pipeline_shard_meta: Callable[[int, int], PipelineShardMetadata],
+    hosts: Callable[[int], list[Host]],
+    chat_completion_task: Callable[[InstanceId, TaskId], Task]
+    ):
+    event_log_manager = EventLogManager(EventLogConfig(), logger)
+    await event_log_manager.initialize()
+    shard_downloader = NoopShardDownloader()
+
+    global_events = event_log_manager.global_events
+    await global_events.delete_all_events()
+
+    worker1 = Worker(NODE_A, logger=logger, shard_downloader=shard_downloader, worker_events=global_events, global_events=global_events)
+    asyncio.create_task(run(worker1))
+
+    worker2 = Worker(NODE_B, logger=logger, shard_downloader=shard_downloader, worker_events=global_events, global_events=global_events)
+    asyncio.create_task(run(worker2))
+
+    ## Instance
+    model_id = ModelId('mlx-community/Llama-3.2-1B-Instruct-4bit')
+
+    shard_assignments = ShardAssignments(
+        model_id=model_id,
+        runner_to_shard={
+            RUNNER_1_ID: pipeline_shard_meta(2, 0),
+            RUNNER_2_ID: pipeline_shard_meta(2, 1)
+        },
+        node_to_runner={
+            NODE_A: RUNNER_1_ID,
+            NODE_B: RUNNER_2_ID
+        }
+    )
+    
+    instance = Instance(
+        instance_id=INSTANCE_1_ID,
+        instance_type=InstanceStatus.ACTIVE,
+        shard_assignments=shard_assignments,
+        hosts=hosts(2)
+    )
+
+    task = chat_completion_task(INSTANCE_1_ID, TASK_1_ID)
+    await global_events.append_events(
+        [
+            InstanceCreated(
+                instance=instance
+            ),
+            TaskCreated(
+                task_id=task.task_id,
+                task=task
+            )
+        ], 
+        origin=MASTER_NODE_ID
+    )
+
+    seen_task_started, seen_task_finished, response_string = await read_streaming_response(global_events)    
+
+    assert seen_task_started
+    assert seen_task_finished
+    assert 'tokyo' in response_string.lower()
+
+
+    idx = await global_events.get_last_idx()
+    await asyncio.sleep(1.0)
+    events = await global_events.get_events_since(idx)
+    assert len(events) == 0
+
+    await global_events.append_events(
+        [
+            InstanceDeleted(
+                instance_id=instance.instance_id,
+            ),
+        ], 
+        origin=MASTER_NODE_ID
+    )
+
+    await asyncio.sleep(2.0)
+
+# TODO: Multi message parallel
+async def test_2_runner_multi_message(
+    logger: Logger,
+    pipeline_shard_meta: Callable[[int, int], PipelineShardMetadata],
+    hosts: Callable[[int], list[Host]],
+    ):
+    event_log_manager = EventLogManager(EventLogConfig(), logger)
+    await event_log_manager.initialize()
+    shard_downloader = NoopShardDownloader()
+
+    global_events = event_log_manager.global_events
+    await global_events.delete_all_events()
+
+    worker1 = Worker(NODE_A, logger=logger, shard_downloader=shard_downloader, worker_events=global_events, global_events=global_events)
+    asyncio.create_task(run(worker1))
+
+    worker2 = Worker(NODE_B, logger=logger, shard_downloader=shard_downloader, worker_events=global_events, global_events=global_events)
+    asyncio.create_task(run(worker2))
+
+    ## Instance
+    model_id = ModelId('mlx-community/Llama-3.2-1B-Instruct-4bit')
+
+    shard_assignments = ShardAssignments(
+        model_id=model_id,
+        runner_to_shard={
+            RUNNER_1_ID: pipeline_shard_meta(2, 0),
+            RUNNER_2_ID: pipeline_shard_meta(2, 1)
+        },
+        node_to_runner={
+            NODE_A: RUNNER_1_ID,
+            NODE_B: RUNNER_2_ID
+        }
+    )
+    
+    instance = Instance(
+        instance_id=INSTANCE_1_ID,
+        instance_type=InstanceStatus.ACTIVE,
+        shard_assignments=shard_assignments,
+        hosts=hosts(2)
+    )
+
+    # Task - we have three messages here, which is what the task is about
+
+    completion_create_params = ChatCompletionTaskParams(
+        model="gpt-4",
+        messages=[
+            ChatCompletionMessage(role="user", content='What is the capital of France?'),
+            ChatCompletionMessage(role="assistant", content='The capital of France is Paris.'),
+            ChatCompletionMessage(role="user", content='Ok great. Now write me a haiku about what you can do there.'),
+        ],
+        stream=True,
+    )
+
+    task = ChatCompletionTask(
+        task_id=TASK_1_ID,
+        command_id=CommandId(),
+        instance_id=INSTANCE_1_ID,
+        task_type=TaskType.CHAT_COMPLETION,
+        task_status=TaskStatus.PENDING,
+        task_params=completion_create_params
+    )
+
+    await global_events.append_events(
+        [
+            InstanceCreated(
+                instance=instance
+            ),
+            TaskCreated(
+                task_id=task.task_id,
+                task=task
+            )
+        ], 
+        origin=MASTER_NODE_ID
+    )
+
+    seen_task_started, seen_task_finished, response_string = await read_streaming_response(global_events)    
+
+    assert seen_task_started
+    assert seen_task_finished
+    assert any(keyword in response_string.lower() for keyword in ('kiss', 'paris', 'art', 'love'))
+
+
+    idx = await global_events.get_last_idx()
+    await asyncio.sleep(1.0)
+    events = await global_events.get_events_since(idx)
+    assert len(events) == 0
+
+    await global_events.append_events(
+        [
+            InstanceDeleted(
+                instance_id=instance.instance_id,
+            ),
+        ], 
+        origin=MASTER_NODE_ID
+    )
+
+    await asyncio.sleep(2.0)
diff --git a/worker/tests/test_supervisor_errors.py b/worker/tests/test_integration/test_supervisor_errors.py
similarity index 65%
rename from worker/tests/test_supervisor_errors.py
rename to worker/tests/test_integration/test_supervisor_errors.py
index 87390898..4dd62dba 100644
--- a/worker/tests/test_supervisor_errors.py
+++ b/worker/tests/test_integration/test_supervisor_errors.py
@@ -1,7 +1,7 @@
 import asyncio
 from collections.abc import AsyncGenerator
 from types import CoroutineType
-from typing import Any, Awaitable, Callable, Final
+from typing import Any, Awaitable, Callable
 
 import pytest
 from _pytest.monkeypatch import MonkeyPatch
@@ -15,11 +15,9 @@ from shared.types.events import (
     InstanceDeleted,
     RunnerStatusUpdated,
     TaskCreated,
-    TaskFailed,
     TaskStateUpdated,
 )
 from shared.types.events.chunks import GenerationChunk, TokenChunk
-from shared.types.models import ModelId
 from shared.types.tasks import Task, TaskId, TaskStatus
 from shared.types.worker.common import InstanceId, RunnerId
 from shared.types.worker.instances import (
@@ -29,20 +27,14 @@ from shared.types.worker.instances import (
 from shared.types.worker.runners import FailedRunnerStatus
 from worker.main import Worker
 from worker.runner.runner_supervisor import RunnerSupervisor
+from worker.tests.constants import (
+    INSTANCE_1_ID,
+    MASTER_NODE_ID,
+    NODE_A,
+    RUNNER_1_ID,
+    TASK_1_ID,
+)
 
-MASTER_NODE_ID = NodeId("ffffffff-aaaa-4aaa-8aaa-aaaaaaaaaaaa")
-NODE_A: Final[NodeId] = NodeId("aaaaaaaa-aaaa-4aaa-8aaa-aaaaaaaaaaaa")
-NODE_B: Final[NodeId] = NodeId("bbbbbbbb-bbbb-4bbb-8bbb-bbbbbbbbbbbb")
-
-# Define constant IDs for deterministic test cases
-RUNNER_1_ID: Final[RunnerId] = RunnerId("11111111-1111-4111-8111-111111111111")
-INSTANCE_1_ID: Final[InstanceId] = InstanceId("22222222-2222-4222-8222-222222222222")
-RUNNER_2_ID: Final[RunnerId] = RunnerId("33333333-3333-4333-8333-333333333333")
-INSTANCE_2_ID: Final[InstanceId] = InstanceId("44444444-4444-4444-8444-444444444444")
-MODEL_A_ID: Final[ModelId] = 'mlx-community/Llama-3.2-1B-Instruct-4bit'
-MODEL_B_ID: Final[ModelId] = 'mlx-community/Llama-3.2-1B-Instruct-4bit'
-TASK_1_ID: Final[TaskId] = TaskId("55555555-5555-4555-8555-555555555555")
-TASK_2_ID: Final[TaskId] = TaskId("66666666-6666-4666-8666-666666666666")
 
 @pytest.fixture
 def user_message():
@@ -187,65 +179,65 @@ async def test_stream_response_failed_once(
     await asyncio.sleep(0.3)
 
 
-async def test_stream_response_timeout(
-    monkeypatch: MonkeyPatch,
-    worker_running: Callable[[NodeId], Awaitable[tuple[Worker, AsyncSQLiteEventStorage]]],
-    instance: Callable[[InstanceId, NodeId, RunnerId], Instance],
-    chat_completion_task: Callable[[InstanceId, TaskId], Task]
-):
-    async def mock_stream_response(
-        self: RunnerSupervisor,
-        task: Task,
-        request_started_callback: Callable[..., CoroutineType[Any, Any, None]] | None = None,
-    ) -> AsyncGenerator[GenerationChunk]:
-        # TODO: Also a test where we yield a few chunks and then time out.
-        print('sleeping starting')
-        await asyncio.sleep(4.)
-        print('sleeping finished')
-        return
-        yield
-
-    monkeypatch.setattr(RunnerSupervisor, 'stream_response', mock_stream_response)
+# async def test_stream_response_timeout(
+#     monkeypatch: MonkeyPatch,
+#     worker_running: Callable[[NodeId], Awaitable[tuple[Worker, AsyncSQLiteEventStorage]]],
+#     instance: Callable[[InstanceId, NodeId, RunnerId], Instance],
+#     chat_completion_task: Callable[[InstanceId, TaskId], Task]
+# ):
+#     async def mock_stream_response(
+#         self: RunnerSupervisor,
+#         task: Task,
+#         request_started_callback: Callable[..., CoroutineType[Any, Any, None]] | None = None,
+#     ) -> AsyncGenerator[GenerationChunk]:
+#         # TODO: Also a test where we yield a few chunks and then time out.
+#         print('sleeping starting')
+#         await asyncio.sleep(4.)
+#         print('sleeping finished')
+#         return
+#         yield
+
+#     monkeypatch.setattr(RunnerSupervisor, 'stream_response', mock_stream_response)
     
-    worker, global_events = await worker_running(NODE_A)
+#     worker, global_events = await worker_running(NODE_A)
 
-    instance_value: Instance = instance(INSTANCE_1_ID, NODE_A, RUNNER_1_ID)
-    instance_value.instance_type = InstanceStatus.ACTIVE
+#     instance_value: Instance = instance(INSTANCE_1_ID, NODE_A, RUNNER_1_ID)
+#     instance_value.instance_type = InstanceStatus.ACTIVE
 
-    task: Task = chat_completion_task(INSTANCE_1_ID, TASK_1_ID)
-    await global_events.append_events(
-        [
-            InstanceCreated(instance=instance_value),
-            TaskCreated(task_id=task.task_id, task=task)
-        ], 
-        origin=MASTER_NODE_ID
-    )
+#     task: Task = chat_completion_task(INSTANCE_1_ID, TASK_1_ID)
+#     await global_events.append_events(
+#         [
+#             InstanceCreated(instance=instance_value),
+#             TaskCreated(task_id=task.task_id, task=task)
+#         ], 
+#         origin=MASTER_NODE_ID
+#     )
 
-    await asyncio.sleep(7.)
+#     await asyncio.sleep(7.)
     
 
-    # as we reset the failures back to zero when we have a successful inference.
+#     # as we reset the failures back to zero when we have a successful inference.
 
-    # print('ASSERTION ERR:')
-    # print(worker.assigned_runners[RUNNER_1_ID].failures[1][1])
+#     # print('ASSERTION ERR:')
+#     # print(worker.assigned_runners[RUNNER_1_ID].failures[1][1])
 
-    assert len(worker.assigned_runners[RUNNER_1_ID].failures) == 0 
-    assert worker.state.tasks[TASK_1_ID].error_type is None
-    assert worker.state.tasks[TASK_1_ID].error_message is None
+#     assert len(worker.assigned_runners[RUNNER_1_ID].failures) == 0 
+#     assert worker.state.tasks[TASK_1_ID].error_type is None
+#     assert worker.state.tasks[TASK_1_ID].error_message is None
 
-    events = await global_events.get_events_since(0)
-    print(events)
-    assert len([x for x in events if isinstance(x.event, RunnerStatusUpdated) and isinstance(x.event.runner_status, FailedRunnerStatus)]) == 1
-    assert len([x for x in events if isinstance(x.event, TaskStateUpdated) and x.event.task_status == TaskStatus.FAILED]) == 1
-    assert len([x for x in events if isinstance(x.event, TaskFailed) and 'timeouterror' in x.event.error_type.lower()]) == 1
+#     events = await global_events.get_events_since(0)
+#     print(events)
+#     assert len([x for x in events if isinstance(x.event, RunnerStatusUpdated) and isinstance(x.event.runner_status, FailedRunnerStatus)]) == 1
+#     assert len([x for x in events if isinstance(x.event, TaskStateUpdated) and x.event.task_status == TaskStatus.FAILED]) == 1
+#     assert len([x for x in events if isinstance(x.event, TaskFailed) and 'timeouterror' in x.event.error_type.lower()]) == 1
 
-    await global_events.append_events(
-        [
-            InstanceDeleted(
-                instance_id=instance_value.instance_id,
-            ),
-        ], 
-        origin=MASTER_NODE_ID
-    )
+#     await global_events.append_events(
+#         [
+#             InstanceDeleted(
+#                 instance_id=instance_value.instance_id,
+#             ),
+#         ], 
+#         origin=MASTER_NODE_ID
+#     )
 
-    await asyncio.sleep(0.3)
\ No newline at end of file
+#     await asyncio.sleep(0.3)
\ No newline at end of file
diff --git a/worker/tests/test_plan/test_worker_plan.py b/worker/tests/test_plan/test_worker_plan.py
new file mode 100644
index 00000000..a14521cb
--- /dev/null
+++ b/worker/tests/test_plan/test_worker_plan.py
@@ -0,0 +1,540 @@
+from __future__ import annotations
+
+import logging
+
+import pytest
+
+from shared.types.api import ChatCompletionMessage
+from shared.types.state import State
+from shared.types.tasks import (
+    ChatCompletionTask,
+    ChatCompletionTaskParams,
+    TaskStatus,
+    TaskType,
+)
+from shared.types.worker.common import NodeStatus
+from shared.types.worker.downloads import (
+    DownloadPending,
+)
+from shared.types.worker.instances import InstanceStatus
+from shared.types.worker.ops import (
+    AssignRunnerOp,
+    ExecuteTaskOp,
+    RunnerDownOp,
+    RunnerUpOp,
+    UnassignRunnerOp,
+)
+from shared.types.worker.runners import (
+    DownloadingRunnerStatus,
+    FailedRunnerStatus,
+    InactiveRunnerStatus,
+    LoadedRunnerStatus,
+    RunningRunnerStatus,
+)
+from shared.types.worker.shards import PipelineShardMetadata
+from worker.common import AssignedRunner
+from worker.download.shard_downloader import NoopShardDownloader
+from worker.main import Worker
+from worker.plan import plan
+from worker.tests.constants import (
+    COMMAND_1_ID,
+    INSTANCE_1_ID,
+    MODEL_A_ID,
+    NODE_A,
+    NODE_B,
+    RUNNER_1_ID,
+    RUNNER_2_ID,
+    TASK_1_ID,
+)
+from worker.tests.test_plan.test_worker_plan_utils import (
+    InProcessRunner,
+    PlanTestCase,
+    make_downloading_status,
+    make_model_meta,
+    make_state,
+    make_test_case,
+)
+
+"""
+The idea with these tests is to define declaratively the input and expected output of the worker.plan function.
+
+We initialize a Worker with InProcessRunners. We then construct a State which gets passed to Worker.plan.
+We then check what operation is returned by Worker.plan.
+
+Note that the 'self' node will always be NODE_A. This leads to the swapped-around cases when checking failure cases etc.
+"""
+
+
+def _get_test_cases() -> list[PlanTestCase]:
+    # The `model_path` for `RUNNER_1_ID` must exist for the `DownloadOp` test case to pass validation.
+    model_a_meta = make_model_meta(MODEL_A_ID)
+    return [
+        PlanTestCase(
+            description="no runners -> no-op",
+            in_process_runners=[],
+            state=State(node_status={NODE_A: NodeStatus.Idle}, instances={}, runners={}),
+            expected_op=None,
+        ),
+
+        # Both 'assigned' and 'downloading' should be blocking ops - so if we are in either of these we should unassign to retry.
+        # This needs to change when we move to an async worker
+        make_test_case(
+            description="runner state assigned, runner is assigned and downloading -> unassign",
+            runner_specs=[{
+                'runner_id': RUNNER_1_ID,
+                'node_id': NODE_A,
+                'device_rank': 0,
+                'status': make_downloading_status(NODE_A),
+                'downloaded': False
+            }],
+            instance_status=InstanceStatus.INACTIVE,
+            expected_op=UnassignRunnerOp(runner_id=RUNNER_1_ID),
+        ),
+ 
+        make_test_case(
+            description="ready runner, model present -> no-op",
+            runner_specs=[{
+                'runner_id': RUNNER_1_ID,
+                'node_id': NODE_A,
+                'device_rank': 0,
+                'status': InactiveRunnerStatus(),
+                'downloaded': True
+            }],
+            instance_status=InstanceStatus.INACTIVE,
+            expected_op=None,
+        ),
+
+        PlanTestCase(
+            description="runner assigned and not in state -> AssignRunnerOp",
+            in_process_runners=[],
+            state=make_state(
+                runner_specs_per_instance={
+                    INSTANCE_1_ID: [(RUNNER_1_ID, NODE_A, 0, InactiveRunnerStatus())]
+                },
+                model_id=MODEL_A_ID,
+                instance_status=InstanceStatus.ACTIVE,  # Either active or inactive should yield the same.
+            ),
+            expected_op=AssignRunnerOp(
+                instance_id=INSTANCE_1_ID,
+                runner_id=RUNNER_1_ID,
+                shard_metadata=PipelineShardMetadata(
+                    device_rank=0,
+                    world_size=1,
+                    model_meta=model_a_meta,
+                    start_layer=0,
+                    end_layer=1,
+                    n_layers=1,
+                ),
+                hosts=[]
+            ),
+        ),
+
+        PlanTestCase(
+            description="runner assigned but no longer in state -> UnassignRunnerOp",
+            in_process_runners=[
+                InProcessRunner(
+                    runner_id=RUNNER_1_ID,
+                    instance_id=INSTANCE_1_ID,
+                    model_id=MODEL_A_ID,
+                    status=InactiveRunnerStatus(),
+                    downloaded=False,
+                )
+            ],
+            state=State(node_status={NODE_A: NodeStatus.Idle}, instances={}, runners={}),
+            expected_op=UnassignRunnerOp(runner_id=RUNNER_1_ID),
+        ),
+
+        make_test_case(
+            description="ready runner (and state up) -> expect RunnerUpOp",
+            runner_specs=[{
+                'runner_id': RUNNER_1_ID,
+                'node_id': NODE_A,
+                'device_rank': 0,
+                'status': InactiveRunnerStatus(),
+                'downloaded': True
+            }],
+            instance_status=InstanceStatus.ACTIVE,
+            expected_op=RunnerUpOp(runner_id=RUNNER_1_ID),
+        ),
+
+        make_test_case(
+            description="1 ready, 1 downloading (and state up) -> no-op",
+            runner_specs=[
+                {
+                    'runner_id': RUNNER_1_ID,
+                    'node_id': NODE_A,
+                    'device_rank': 0,
+                    'status': InactiveRunnerStatus(),
+                    'downloaded': True
+                },
+                {
+                    'runner_id': RUNNER_2_ID,
+                    'node_id': NODE_B,
+                    'device_rank': 1,
+                    'status': DownloadingRunnerStatus(download_progress=DownloadPending(node_id=NODE_A)),
+                    'downloaded': False
+                }
+            ],
+            tasks=[{
+                'task_id': TASK_1_ID,
+                'instance_id': INSTANCE_1_ID,
+                'status': TaskStatus.PENDING,
+                'messages': [{'role': 'user', 'content': 'Hello, world!'}]
+            }],
+            instance_status=InstanceStatus.ACTIVE,
+            expected_op=None
+        ),
+
+        make_test_case(
+            description="2 ready runners (and state up) -> expect RunnerUpOp",
+            runner_specs=[
+                {
+                    'runner_id': RUNNER_1_ID,
+                    'node_id': NODE_A,
+                    'device_rank': 0,
+                    'status': InactiveRunnerStatus(),
+                    'downloaded': True
+                },
+                {
+                    'runner_id': RUNNER_2_ID,
+                    'node_id': NODE_B,
+                    'device_rank': 1,
+                    'status': InactiveRunnerStatus(),
+                    'downloaded': True
+                }
+            ],
+            tasks=[{
+                'task_id': TASK_1_ID,
+                'instance_id': INSTANCE_1_ID,
+                'status': TaskStatus.PENDING,
+                'messages': [{'role': 'user', 'content': 'Hello, world!'}]
+            }],
+            instance_status=InstanceStatus.ACTIVE,
+            expected_op=RunnerUpOp(runner_id=RUNNER_1_ID)
+        ),
+
+        make_test_case(
+            description="loaded runner (and state down) -> expect RunnerDownOp",
+            runner_specs=[{
+                'runner_id': RUNNER_1_ID,
+                'node_id': NODE_A,
+                'device_rank': 0,
+                'status': LoadedRunnerStatus(),
+                'downloaded': True
+            }],
+            instance_status=InstanceStatus.INACTIVE,
+            expected_op=RunnerDownOp(runner_id=RUNNER_1_ID),
+        ),
+
+        make_test_case(
+            description="failed runner (and state down) -> expect RunnerDownOp",
+            runner_specs=[{
+                'runner_id': RUNNER_1_ID,
+                'node_id': NODE_A,
+                'device_rank': 0,
+                'status': FailedRunnerStatus(),
+                'downloaded': True
+            }],
+            instance_status=InstanceStatus.INACTIVE,
+            expected_op=RunnerDownOp(runner_id=RUNNER_1_ID),
+        ),
+
+        make_test_case(
+            description="loaded runner, model present, task pending -> expect ExecuteTaskOp",
+            runner_specs=[{
+                'runner_id': RUNNER_1_ID,
+                'node_id': NODE_A,
+                'device_rank': 0,
+                'status': LoadedRunnerStatus(),
+                'downloaded': True
+            }],
+            tasks=[{
+                'task_id': TASK_1_ID,
+                'instance_id': INSTANCE_1_ID,
+                'status': TaskStatus.PENDING,
+                'messages': [{'role': 'user', 'content': 'Hello, world!'}]
+            }],
+            instance_status=InstanceStatus.ACTIVE,
+            expected_op=ExecuteTaskOp(runner_id=RUNNER_1_ID, task=ChatCompletionTask(
+                task_id=TASK_1_ID,
+                command_id=COMMAND_1_ID,
+                instance_id=INSTANCE_1_ID,
+                task_type=TaskType.CHAT_COMPLETION,
+                task_status=TaskStatus.PENDING,
+                task_params=ChatCompletionTaskParams(
+                    model=str(MODEL_A_ID),
+                    messages=[ChatCompletionMessage(role="user", content="Hello, world!")]
+                ),
+            )),
+        ),
+
+        # We should only run rank 0 once all other ranks are running.
+        make_test_case(
+            description="two loaded runners & task, i'm rank 0 -> no-op",
+            runner_specs=[
+                {
+                    'runner_id': RUNNER_1_ID,
+                    'node_id': NODE_A,
+                    'device_rank': 0,
+                    'status': LoadedRunnerStatus(),
+                    'downloaded': True
+                },
+                {
+                    'runner_id': RUNNER_2_ID,
+                    'node_id': NODE_B,
+                    'device_rank': 1,
+                    'status': LoadedRunnerStatus(),
+                    'downloaded': True
+                }
+            ],
+            tasks=[{
+                'task_id': TASK_1_ID,
+                'instance_id': INSTANCE_1_ID,
+                'status': TaskStatus.PENDING,
+                'messages': [{'role': 'user', 'content': 'Hello, world!'}]
+            }],
+            instance_status=InstanceStatus.ACTIVE,
+            expected_op=None
+        ),
+
+        make_test_case(
+            description="two loaded runners & task, i'm rank 1 -> expect ExecuteTaskOp on rank 1",
+            runner_specs=[
+                {
+                    'runner_id': RUNNER_1_ID,
+                    'node_id': NODE_A,
+                    'device_rank': 1,
+                    'status': LoadedRunnerStatus(),
+                    'downloaded': True
+                },
+                {
+                    'runner_id': RUNNER_2_ID,
+                    'node_id': NODE_B,
+                    'device_rank': 0,
+                    'status': LoadedRunnerStatus(),
+                    'downloaded': True
+                }
+            ],
+            tasks=[{
+                'task_id': TASK_1_ID,
+                'instance_id': INSTANCE_1_ID,
+                'status': TaskStatus.PENDING,
+                'messages': [{'role': 'user', 'content': 'Hello, world!'}]
+            }],
+            instance_status=InstanceStatus.ACTIVE,
+            expected_op=ExecuteTaskOp(
+                runner_id=RUNNER_1_ID,
+                task=ChatCompletionTask(
+                    task_id=TASK_1_ID,
+                    command_id=COMMAND_1_ID,
+                    instance_id=INSTANCE_1_ID,
+                    task_type=TaskType.CHAT_COMPLETION,
+                    task_params=ChatCompletionTaskParams(
+                        model=str(MODEL_A_ID),
+                        messages=[ChatCompletionMessage(role="user", content="Hello, world!")],
+                    ),
+                    task_status=TaskStatus.PENDING,
+                ),
+            ),
+        ),
+
+        make_test_case(
+            description="rank 1 loaded, rank 0 ready, i'm rank 0  -> expect ExecuteTaskOp on rank 0",
+            runner_specs=[
+                {
+                    'runner_id': RUNNER_1_ID,
+                    'node_id': NODE_A,
+                    'device_rank': 0,
+                    'status': LoadedRunnerStatus(),
+                    'downloaded': True
+                },
+                {
+                    'runner_id': RUNNER_2_ID,
+                    'node_id': NODE_B,
+                    'device_rank': 1,
+                    'status': RunningRunnerStatus(),
+                    'downloaded': True
+                }
+            ],
+            tasks=[{
+                'task_id': TASK_1_ID,
+                'instance_id': INSTANCE_1_ID,
+                'status': TaskStatus.PENDING,
+                'messages': [{'role': 'user', 'content': 'Hello, world!'}]
+            }],
+            instance_status=InstanceStatus.ACTIVE,
+            expected_op=ExecuteTaskOp(
+                runner_id=RUNNER_1_ID,
+                task=ChatCompletionTask(
+                    task_id=TASK_1_ID,
+                    command_id=COMMAND_1_ID,
+                    instance_id=INSTANCE_1_ID,
+                    task_type=TaskType.CHAT_COMPLETION,
+                    task_params=ChatCompletionTaskParams(
+                        model=str(MODEL_A_ID),
+                        messages=[ChatCompletionMessage(role="user", content="Hello, world!")],
+                    ),
+                    task_status=TaskStatus.PENDING,
+                ),
+            ),
+        ),
+
+        make_test_case(
+            description="this runner failed (1 node) -> RunnerDownOp",
+            runner_specs=[{
+                'runner_id': RUNNER_1_ID,
+                'node_id': NODE_A,
+                'device_rank': 0,
+                'status': FailedRunnerStatus(),
+                'downloaded': True
+            }],
+            instance_status=InstanceStatus.ACTIVE,
+            expected_op=RunnerDownOp(runner_id=RUNNER_1_ID)
+        ),
+
+        make_test_case(
+            description="other runner failed -> RunnerDownOp",
+            runner_specs=[
+                {
+                    'runner_id': RUNNER_1_ID,
+                    'node_id': NODE_A,
+                    'device_rank': 0,
+                    'status': LoadedRunnerStatus(),
+                    'downloaded': True
+                },
+                {
+                    'runner_id': RUNNER_2_ID,
+                    'node_id': NODE_B,
+                    'device_rank': 1,
+                    'status': FailedRunnerStatus(),
+                    'downloaded': True
+                }
+            ],
+            instance_status=InstanceStatus.ACTIVE,
+            expected_op=RunnerDownOp(runner_id=RUNNER_1_ID)
+        ),
+
+
+        make_test_case(
+            description="this runner failed (2 nodes) -> no-op",
+            runner_specs=[
+                {
+                    'runner_id': RUNNER_1_ID,
+                    'node_id': NODE_A,
+                    'device_rank': 0,
+                    'status': FailedRunnerStatus(),
+                    'downloaded': True
+                },
+                {
+                    'runner_id': RUNNER_2_ID,
+                    'node_id': NODE_B,
+                    'device_rank': 1,
+                    'status': LoadedRunnerStatus(),
+                    'downloaded': True
+                }
+            ],
+            instance_status=InstanceStatus.ACTIVE,
+            expected_op=None
+        ),
+
+        make_test_case(
+            description="this node failed, other node spun down -> RunnerDownOp",
+            runner_specs=[
+                {
+                    'runner_id': RUNNER_1_ID,
+                    'node_id': NODE_A,
+                    'device_rank': 0,
+                    'status': FailedRunnerStatus(),
+                    'downloaded': True
+                },
+                {
+                    'runner_id': RUNNER_2_ID,
+                    'node_id': NODE_B,
+                    'device_rank': 1,
+                    'status': InactiveRunnerStatus(),
+                    'downloaded': True
+                }
+            ],
+            instance_status=InstanceStatus.ACTIVE,
+            expected_op=RunnerDownOp(runner_id=RUNNER_1_ID)
+        ),
+
+    ]
+
+
+# ---------------------------------------------------------------------------
+# Parametrised test
+# ---------------------------------------------------------------------------
+
+
+# Pre-compute readable identifiers for each case to avoid lambda typing issues.
+@pytest.mark.parametrize(
+    "case",
+    # We use a factory to delay test case generation until tmp_path is available.
+    [pytest.param(c, id=c.id()) for c in _get_test_cases()],
+)
+def test_worker_plan(case: PlanTestCase) -> None:
+    """Exercise Worker.plan across declarative scenarios."""
+
+    print(f"----- case: {case.description}")
+
+    # Regenerate test cases with the actual tmp_path fixture
+    test_cases = {c.description: c for c in _get_test_cases()}
+    case = test_cases[case.description]
+
+    node_id = NODE_A
+
+    logger = logging.getLogger("test_worker_plan")
+    shard_downloader = NoopShardDownloader()
+    worker = Worker(node_id=node_id, shard_downloader=shard_downloader, worker_events=None, global_events=None, logger=logger)
+
+    runner_config: InProcessRunner
+    for runner_config in case.in_process_runners:
+        
+        if len(case.state.instances) == 1: 
+            instance_id = next(iter(case.state.instances))
+
+            shard_assignments = case.state.instances[instance_id].shard_assignments
+            shard_metadata = shard_assignments.runner_to_shard[runner_config.runner_id]
+            
+            # Only add this runner if it belongs to our node
+            runner_node = None
+            for node, runner in shard_assignments.node_to_runner.items():
+                if runner == runner_config.runner_id:
+                    runner_node = node
+                    break
+            
+            if runner_node != node_id:
+                # This runner belongs to a different node, skip it
+                continue
+                
+        elif len(case.state.instances) == 0:
+            shard_metadata = PipelineShardMetadata(
+                device_rank=runner_config.device_rank,
+            world_size=1,
+                model_meta=make_model_meta(runner_config.model_id),
+                start_layer=0,
+                end_layer=1,
+                n_layers=1,
+            )
+        else:
+            raise Exception('test_worker_plan not currently designed to have more than 1 instance.')
+
+
+        assigned_runner = AssignedRunner(
+            runner_id=runner_config.runner_id,
+            instance_id=runner_config.instance_id,
+            shard_metadata=shard_metadata,
+            hosts=[],
+            status=runner_config.status,
+            runner=None,
+        )
+        worker.assigned_runners[runner_config.runner_id] = assigned_runner
+
+    op = plan(worker.assigned_runners, 
+                   NODE_A,
+                   case.state.instances,
+                   case.state.runners,
+                   case.state.tasks,
+                   )
+    assert op == case.expected_op
diff --git a/worker/tests/test_plan/test_worker_plan_utils.py b/worker/tests/test_plan/test_worker_plan_utils.py
new file mode 100644
index 00000000..49283013
--- /dev/null
+++ b/worker/tests/test_plan/test_worker_plan_utils.py
@@ -0,0 +1,272 @@
+from __future__ import annotations
+
+from dataclasses import dataclass
+from typing import List, NotRequired, Optional, TypedDict
+
+from typing_extensions import Literal
+
+from shared.models.model_cards import MODEL_CARDS, ModelCard
+from shared.types.api import ChatCompletionMessage, ChatCompletionTaskParams
+from shared.types.common import CommandId, NodeId
+from shared.types.models import ModelId, ModelMetadata
+from shared.types.state import State
+from shared.types.tasks import ChatCompletionTask, TaskId, TaskStatus, TaskType
+from shared.types.worker.common import InstanceId, NodeStatus, RunnerId
+from shared.types.worker.downloads import DownloadOngoing, DownloadProgressData
+from shared.types.worker.instances import Instance, InstanceStatus
+from shared.types.worker.ops import RunnerOp
+from shared.types.worker.runners import (
+    DownloadingRunnerStatus,
+    RunnerStatus,
+    RunningRunnerStatus,
+    ShardAssignments,
+)
+from shared.types.worker.shards import PipelineShardMetadata
+from worker.tests.constants import COMMAND_1_ID, INSTANCE_1_ID, MODEL_A_ID
+
+
+class RunnerSpecDict(TypedDict):
+    """Type definition for runner specification dictionaries."""
+    runner_id: RunnerId
+    node_id: NodeId
+    device_rank: int
+    status: RunnerStatus
+    downloaded: NotRequired[bool]  # defaults to True if not provided
+
+
+class MessageDict(TypedDict):
+    """Type definition for message dictionaries."""
+    role: Literal["system", "user", "assistant", "developer", "tool", "function"]
+    content: NotRequired[str | None]
+    name: NotRequired[str | None]
+    tool_calls: NotRequired[list[dict[str, str]] | None]
+    tool_call_id: NotRequired[str | None]
+    function_call: NotRequired[dict[str, str] | None]
+
+
+class TaskSpecDict(TypedDict):
+    """Type definition for task specification dictionaries."""
+    task_id: TaskId
+    instance_id: NotRequired[InstanceId]  # defaults to function parameter if not provided
+    command_id: NotRequired[CommandId]  # defaults to COMMAND_1_ID if not provided  
+    status: NotRequired[TaskStatus]  # defaults to TaskStatus.PENDING if not provided
+    model: NotRequired[str]  # defaults to model_id if not provided
+    messages: NotRequired[list[MessageDict]]  # defaults to [{'role': 'user', 'content': 'Hello, world!'}] if not provided
+
+
+@dataclass(slots=True, frozen=True)
+class InProcessRunner:
+    """Minimal description of a runner's in-process state."""
+
+    runner_id: RunnerId
+    instance_id: InstanceId
+    model_id: ModelId
+    status: RunnerStatus
+    downloaded: bool
+    device_rank: int = 0
+
+
+@dataclass(slots=True, frozen=True)
+class PlanTestCase:
+    """Table-driven description of an entire planning scenario."""
+
+    description: str
+    state: State
+    in_process_runners: List[InProcessRunner]
+    expected_op: Optional[RunnerOp]
+
+    def id(self) -> str:  # noqa: D401
+        return self.description.replace(" ", "_")
+
+
+def make_shard_metadata(device_rank: int, world_size: int, model_id: ModelId = MODEL_A_ID) -> PipelineShardMetadata:
+    """Create PipelineShardMetadata with proper layer assignments based on device_rank and world_size."""
+    total_layers = world_size  # For simplicity in tests, total_layers = world_size
+    
+    if world_size == 1:
+        start_layer = 0
+        end_layer = 1
+        n_layers = 1
+    else:
+        # For multi-device setup, each device gets one layer
+        start_layer = device_rank
+        end_layer = device_rank + 1
+        n_layers = total_layers
+    
+    return PipelineShardMetadata(
+        device_rank=device_rank,
+        world_size=world_size,
+        model_meta=make_model_meta(model_id),
+        start_layer=start_layer,
+        end_layer=end_layer,
+        n_layers=n_layers,
+    )
+
+
+def make_downloading_status(node_id: NodeId) -> DownloadingRunnerStatus:
+    """Factory for a *Downloading* status with placeholder progress."""
+    return DownloadingRunnerStatus(
+        download_progress=DownloadOngoing(
+            node_id=node_id,
+            download_progress=DownloadProgressData(total_bytes=1, downloaded_bytes=0),
+        )
+    )
+
+def make_model_meta(
+    model_id: str
+) -> ModelMetadata:
+    model_card: ModelCard
+    for card in MODEL_CARDS.values():
+        if card.model_id == model_id:
+            model_card = card
+
+            return ModelMetadata(
+                model_id=model_id,
+                pretty_name=model_card.model_id,
+                storage_size_kilobytes=10**6,
+                n_layers=16,
+            )
+    
+    raise Exception(f'Unknown model_id passed: {model_id}')
+
+    ## Alternatively, if we are ok for this method to be async:
+    # await _get_model_meta(model_id)
+
+
+
+def make_instance(
+    instance_id: InstanceId,
+    runner_specs: list[tuple[RunnerId, NodeId, int, RunnerStatus]],
+    model_id: ModelId = MODEL_A_ID,
+    instance_status: InstanceStatus = InstanceStatus.ACTIVE,
+) -> tuple[Instance, dict[RunnerId, RunnerStatus], dict[NodeId, NodeStatus]]:
+    """Creates an instance with one or more runners."""
+    runner_to_shard: dict[RunnerId, PipelineShardMetadata] = {}
+    node_to_runner: dict[NodeId, RunnerId] = {}
+    world_size = len(runner_specs)
+
+    for runner_id, node_id, device_rank, _ in runner_specs:
+        shard_metadata = make_shard_metadata(
+            device_rank,
+            world_size,
+            model_id
+        )
+        runner_to_shard[runner_id] = shard_metadata
+        node_to_runner[node_id] = runner_id
+
+    shard_assignments = ShardAssignments(
+        model_id=model_id,
+        runner_to_shard=runner_to_shard,
+        node_to_runner=node_to_runner,
+    )
+    instance = Instance(
+        instance_id=instance_id,
+        instance_type=instance_status,
+        shard_assignments=shard_assignments,
+        hosts=[],
+    )
+
+    # Currently nodes are only ever idle - as if they were running we would be blocking - so we wouldn't be running plan()
+    # node_statuses = {node_id: NodeStatus.Idle for _, node_id, _, _ in runner_specs}  
+    node_statuses: dict[NodeId, NodeStatus] = {}
+    for _runner_id, node_id, _, status in runner_specs:
+        if isinstance(status, RunningRunnerStatus):
+            node_statuses[node_id] = NodeStatus.Running
+        else:
+            node_statuses[node_id] = NodeStatus.Idle
+    runner_statuses = {runner_id: status for runner_id, _, _, status in runner_specs}
+
+    return instance, runner_statuses, node_statuses
+
+def make_state(
+    runner_specs_per_instance: dict[InstanceId, list[tuple[RunnerId, NodeId, int, RunnerStatus]]],
+    tasks: dict[TaskId, ChatCompletionTask] | None = None,
+    model_id: ModelId = MODEL_A_ID,
+    instance_status: InstanceStatus = InstanceStatus.ACTIVE,
+) -> State:
+    """Builds a full State from runner specs per instance, tasks, and defaults."""
+    if tasks is None:
+        tasks = {}
+    instances: dict[InstanceId, Instance] = {}
+    all_runner_statuses: dict[RunnerId, RunnerStatus] = {}
+    all_node_statuses: dict[NodeId, NodeStatus] = {}
+
+    for inst_id, specs in runner_specs_per_instance.items():
+        # Build per-instance data using make_instance
+        instance, runner_statuses, node_statuses = make_instance(
+            instance_id=inst_id,
+            runner_specs=specs,
+            model_id=model_id,
+            instance_status=instance_status,
+        )
+        instances[inst_id] = instance
+        all_runner_statuses.update(runner_statuses)
+        all_node_statuses.update(node_statuses)
+
+    return State(
+        node_status=all_node_statuses,
+        instances=instances,
+        runners=all_runner_statuses,
+        tasks=tasks,
+    )
+
+def make_test_case(
+    description: str,
+    runner_specs: list[RunnerSpecDict],
+    tasks: list[TaskSpecDict] | None = None,
+    expected_op: Optional[RunnerOp] = None,
+    instance_id: InstanceId = INSTANCE_1_ID,
+    instance_status: InstanceStatus = InstanceStatus.ACTIVE,
+    model_id: ModelId = MODEL_A_ID,
+    command_id: CommandId = COMMAND_1_ID,  # Default for tasks
+) -> PlanTestCase:
+    """Builds a PlanTestCase from high-level specs."""
+    if tasks is None:
+        tasks = []
+    # Convert runner_specs to tuple format for make_instance
+    specs_tuple = [
+        (r['runner_id'], r['node_id'], r['device_rank'], r['status'])
+        for r in runner_specs
+    ]
+
+    # Build state using make_state (wrap single instance)
+    state_tasks: dict[TaskId, ChatCompletionTask] = {}
+    for t in tasks:
+        task = ChatCompletionTask(
+            instance_id=instance_id,
+            task_id=t['task_id'],
+            command_id=t.get('command_id', command_id),
+            task_type=TaskType.CHAT_COMPLETION,
+            task_status=t.get('status', TaskStatus.PENDING),
+            task_params=ChatCompletionTaskParams(
+                model=t.get('model', str(model_id)),
+                messages=[ChatCompletionMessage(**m) for m in t.get('messages', [{'role': 'user', 'content': 'Hello, world!'}])],
+            ),
+        )
+        state_tasks[t['task_id']] = task
+
+    state = make_state(
+        runner_specs_per_instance={instance_id: specs_tuple},
+        tasks=state_tasks,
+        model_id=model_id,
+        instance_status=instance_status,
+    )
+
+    # Build in_process_runners with downloaded (default True if missing)
+    in_process_runners = [
+        InProcessRunner(
+            runner_id=r['runner_id'],
+            instance_id=instance_id,
+            model_id=model_id,
+            status=r['status'],
+            downloaded=r.get('downloaded', True),
+            device_rank=r['device_rank'],
+        ) for r in runner_specs
+    ]
+
+    return PlanTestCase(
+        description=description,
+        state=state,
+        in_process_runners=in_process_runners,
+        expected_op=expected_op,
+    )
\ No newline at end of file
diff --git a/worker/tests/test_runner_connection.py b/worker/tests/test_runner_connection.py
index c988224b..17ddfe79 100644
--- a/worker/tests/test_runner_connection.py
+++ b/worker/tests/test_runner_connection.py
@@ -9,13 +9,13 @@ from shared.db.sqlite.event_log_manager import EventLogConfig, EventLogManager
 from shared.types.common import Host, NodeId
 from shared.types.events import InstanceCreated, InstanceDeleted
 from shared.types.models import ModelId
-from shared.types.tasks import Task
 from shared.types.worker.common import InstanceId, RunnerId
 from shared.types.worker.instances import Instance, InstanceStatus, ShardAssignments
 from shared.types.worker.runners import FailedRunnerStatus
 from shared.types.worker.shards import PipelineShardMetadata
 from worker.download.shard_downloader import NoopShardDownloader
-from worker.main import Worker
+from worker.main import run
+from worker.worker import Worker
 
 MASTER_NODE_ID = NodeId("ffffffff-aaaa-4aaa-8aaa-aaaaaaaaaaaa")
 NODE_A: Final[NodeId] = NodeId("aaaaaaaa-aaaa-4aaa-8aaa-aaaaaaaaaaaa")
@@ -42,7 +42,6 @@ async def check_runner_connection(
     logger: Logger,
     pipeline_shard_meta: Callable[[int, int], PipelineShardMetadata],
     hosts: Callable[[int], list[Host]],
-    chat_completion_task: Callable[[InstanceId, str], Task],
 ) -> bool:
     # Track all tasks and workers for cleanup
     tasks: list[asyncio.Task[None]] = []
@@ -64,7 +63,7 @@ async def check_runner_connection(
             global_events=global_events,
         )
         workers.append(worker1)
-        task1 = asyncio.create_task(worker1.run())
+        task1 = asyncio.create_task(run(worker1))
         tasks.append(task1)
 
         worker2 = Worker(
@@ -75,7 +74,7 @@ async def check_runner_connection(
             global_events=global_events,
         )
         workers.append(worker2)
-        task2 = asyncio.create_task(worker2.run())
+        task2 = asyncio.create_task(run(worker2))
         tasks.append(task2)
 
         model_id = ModelId('mlx-community/Llama-3.2-1B-Instruct-4bit')
@@ -151,39 +150,41 @@ async def check_runner_connection(
 
 # Check Running status
 
-def test_runner_connection_stress(
-    logger: Logger,
-    pipeline_shard_meta: Callable[[int, int], PipelineShardMetadata],
-    hosts: Callable[[int], list[Host]],
-    chat_completion_task: Callable[[InstanceId, str], Task],
-) -> None:
-    total_runs = 100
-    successes = 0
+# # not now.
+
+# def test_runner_connection_stress(
+#     logger: Logger,
+#     pipeline_shard_meta: Callable[[int, int], PipelineShardMetadata],
+#     hosts: Callable[[int], list[Host]],
+#     chat_completion_task: Callable[[InstanceId, str], Task],
+# ) -> None:
+#     total_runs = 100
+#     successes = 0
     
-    for _ in range(total_runs):
-        # Create a fresh event loop for each iteration
-        loop = asyncio.new_event_loop()
-        asyncio.set_event_loop(loop)
+#     for _ in range(total_runs):
+#         # Create a fresh event loop for each iteration
+#         loop = asyncio.new_event_loop()
+#         asyncio.set_event_loop(loop)
         
-        try:
-            result = loop.run_until_complete(check_runner_connection(
-                logger=logger,
-                pipeline_shard_meta=pipeline_shard_meta,
-                hosts=hosts,
-                chat_completion_task=chat_completion_task,
-            ))
-            if result:
-                successes += 1
-        finally:
-            # Cancel all running tasks
-            pending = asyncio.all_tasks(loop)
-            for task in pending:
-                task.cancel()
+#         try:
+#             result = loop.run_until_complete(check_runner_connection(
+#                 logger=logger,
+#                 pipeline_shard_meta=pipeline_shard_meta,
+#                 hosts=hosts,
+#                 chat_completion_task=chat_completion_task,
+#             ))
+#             if result:
+#                 successes += 1
+#         finally:
+#             # Cancel all running tasks
+#             pending = asyncio.all_tasks(loop)
+#             for task in pending:
+#                 task.cancel()
             
-            # Run the event loop briefly to allow cancellation to complete
-            loop.run_until_complete(asyncio.gather(*pending, return_exceptions=True))
+#             # Run the event loop briefly to allow cancellation to complete
+#             loop.run_until_complete(asyncio.gather(*pending, return_exceptions=True))
             
-            # Close the event loop
-            loop.close()
+#             # Close the event loop
+#             loop.close()
     
-    print(f"Runner connection successes: {successes} / {total_runs}")
+#     print(f"Runner connection successes: {successes} / {total_runs}")
diff --git a/worker/tests/test_serdes.py b/worker/tests/test_serdes.py
index 67782e4f..29484833 100644
--- a/worker/tests/test_serdes.py
+++ b/worker/tests/test_serdes.py
@@ -1,4 +1,3 @@
-from pathlib import Path
 from typing import Callable, TypeVar
 
 from pydantic import BaseModel, TypeAdapter
@@ -28,7 +27,6 @@ def assert_equal_serdes(obj: T, typeadapter: TypeAdapter[T]):
 def test_supervisor_setup_message_serdes(
     pipeline_shard_meta: Callable[..., PipelineShardMetadata],
     hosts: Callable[..., list[Host]],
-    tmp_path: Path,
 ):
     setup_message = SetupMessage(
         model_shard_meta=pipeline_shard_meta(1, 0),
diff --git a/worker/tests/test_spinup_timeout.py b/worker/tests/test_spinup_timeout.py
index f8966d8e..c01363fa 100644
--- a/worker/tests/test_spinup_timeout.py
+++ b/worker/tests/test_spinup_timeout.py
@@ -10,13 +10,13 @@ from shared.types.events import (
 )
 from shared.types.events._events import RunnerStatusUpdated
 from shared.types.tasks import Task, TaskId
-from shared.types.worker.common import RunnerId
 from shared.types.worker.instances import Instance, InstanceId
 from shared.types.worker.ops import (
     RunnerUpOp,
 )
 from shared.types.worker.runners import FailedRunnerStatus
 from worker.main import Worker
+from worker.tests.constants import RUNNER_1_ID
 
 # To enable this test, run pytest with: ENABLE_SPINUP_TIMEOUT_TEST=true pytest
 
@@ -26,13 +26,13 @@ from worker.main import Worker
 )
 @pytest.mark.asyncio
 async def test_runner_up_op_timeout(
-    worker_with_assigned_runner: tuple[Worker, RunnerId, Instance], 
+    worker_with_assigned_runner: tuple[Worker, Instance], 
     chat_completion_task: Callable[[InstanceId, TaskId], Task], 
     monkeypatch: pytest.MonkeyPatch
     ):
-    worker, runner_id, _ = worker_with_assigned_runner
+    worker, _ = worker_with_assigned_runner
 
-    runner_up_op = RunnerUpOp(runner_id=runner_id)
+    runner_up_op = RunnerUpOp(runner_id=RUNNER_1_ID)
 
     # _execute_runner_up_op should throw a TimeoutError with a short timeout
     events: list[Event] = []
diff --git a/worker/tests/test_supervisor.py b/worker/tests/test_supervisor/test_supervisor.py
similarity index 98%
rename from worker/tests/test_supervisor.py
rename to worker/tests/test_supervisor/test_supervisor.py
index 915c7393..59ddcf91 100644
--- a/worker/tests/test_supervisor.py
+++ b/worker/tests/test_supervisor/test_supervisor.py
@@ -1,6 +1,5 @@
 import asyncio
 from logging import Logger
-from pathlib import Path
 from typing import Callable
 
 import pytest
@@ -30,7 +29,6 @@ async def test_supervisor_single_node_response(
     pipeline_shard_meta: Callable[..., PipelineShardMetadata],
     hosts: Callable[..., list[Host]],
     chat_completion_task: Callable[[InstanceId, TaskId], Task],
-    tmp_path: Path,
     logger: Logger,
 ):
     """Test that asking for the capital of France returns 'Paris' in the response"""
@@ -70,7 +68,6 @@ async def test_supervisor_two_node_response(
     pipeline_shard_meta: Callable[..., PipelineShardMetadata],
     hosts: Callable[..., list[Host]],
     chat_completion_task: Callable[[InstanceId, TaskId], Task],
-    tmp_path: Path,
     logger: Logger,
 ):
     """Test that asking for the capital of France returns 'Paris' in the response"""
@@ -133,7 +130,6 @@ async def test_supervisor_early_stopping(
     pipeline_shard_meta: Callable[..., PipelineShardMetadata],
     hosts: Callable[..., list[Host]],
     chat_completion_task: Callable[[InstanceId, TaskId], Task],
-    tmp_path: Path,
     logger: Logger,
 ):
     """Test that asking for the capital of France returns 'Paris' in the response"""
@@ -189,7 +185,6 @@ async def test_supervisor_handles_terminated_runner(
     pipeline_shard_meta: Callable[..., PipelineShardMetadata],
     hosts: Callable[..., list[Host]],
     logger: Logger,
-    tmp_path: Path,
 ):
     """Test that the supervisor handles a terminated runner"""
     model_shard_meta = pipeline_shard_meta(1, 0)
@@ -214,7 +209,6 @@ async def test_supervisor_handles_terminated_runner(
 async def test_supervisor_handles_killed_runner(
     pipeline_shard_meta: Callable[..., PipelineShardMetadata],
     hosts: Callable[..., list[Host]],
-    tmp_path: Path,
     logger: Logger,
 ):
     """Test that the supervisor handles a killed runner"""
diff --git a/worker/tests/test_worker_handlers.py b/worker/tests/test_worker_handlers.py
deleted file mode 100644
index bc145db7..00000000
--- a/worker/tests/test_worker_handlers.py
+++ /dev/null
@@ -1,237 +0,0 @@
-## Tests for worker state handlers
-
-from pathlib import Path
-from typing import Callable
-
-import pytest
-
-from shared.types.common import NodeId
-from shared.types.events import (
-    ChunkGenerated,
-    Event,
-    RunnerDeleted,
-    RunnerStatusUpdated,
-    TaskFailed,
-    TaskStateUpdated,
-)
-from shared.types.events.chunks import TokenChunk
-from shared.types.tasks import Task, TaskId, TaskStatus
-from shared.types.worker.common import RunnerId
-from shared.types.worker.instances import Instance, InstanceId
-from shared.types.worker.ops import (
-    AssignRunnerOp,
-    DownloadOp,
-    ExecuteTaskOp,
-    RunnerDownOp,
-    RunnerUpOp,
-    UnassignRunnerOp,
-)
-from shared.types.worker.runners import (
-    AssignedRunnerStatus,
-    FailedRunnerStatus,
-    LoadedRunnerStatus,
-    ReadyRunnerStatus,
-    RunningRunnerStatus,
-)
-from worker.main import Worker
-
-
-@pytest.fixture
-def user_message():
-    """Override the default message to ask about France's capital"""
-    return "What, according to Douglas Adams, is the meaning of life, the universe and everything?"
-
-@pytest.mark.asyncio
-async def test_assign_op(worker: Worker, instance: Callable[[InstanceId, NodeId, RunnerId], Instance], tmp_path: Path):
-    runner_id = RunnerId()
-    instance_obj: Instance = instance(InstanceId(), worker.node_id, runner_id)
-
-    assign_op = AssignRunnerOp(
-        runner_id=runner_id,
-        shard_metadata=instance_obj.shard_assignments.runner_to_shard[runner_id],
-        hosts=instance_obj.hosts,
-        instance_id=instance_obj.instance_id,
-    )
-
-    events: list[Event] = []
-
-    async for event in worker._execute_op(assign_op):  # type: ignore[misc]
-        events.append(event)
-
-    # We should have a status update saying 'starting'.
-    assert len(events) == 1
-    assert isinstance(events[0], RunnerStatusUpdated)
-    assert isinstance(events[0].runner_status, AssignedRunnerStatus)
-
-    # And the runner should be assigned
-    assert runner_id in worker.assigned_runners
-    assert isinstance(worker.assigned_runners[runner_id].status, AssignedRunnerStatus)
-
-@pytest.mark.asyncio
-async def test_unassign_op(worker_with_assigned_runner: tuple[Worker, RunnerId, Instance], tmp_path: Path):
-    worker, runner_id, _ = worker_with_assigned_runner
-
-    unassign_op = UnassignRunnerOp(
-        runner_id=runner_id
-    )
-
-    events: list[Event] = []
-
-    async for event in worker._execute_op(unassign_op):  # type: ignore[misc]
-        events.append(event)
-
-    # We should have no assigned runners and no events were emitted
-    assert len(worker.assigned_runners) == 0
-    assert len(events) == 1
-    assert isinstance(events[0], RunnerDeleted)
-
-@pytest.mark.asyncio
-async def test_runner_up_op(
-    worker_with_assigned_runner: tuple[Worker, RunnerId, Instance], 
-    chat_completion_task: Callable[[InstanceId, TaskId], Task], 
-    tmp_path: Path
-    ):
-    worker, runner_id, _ = worker_with_assigned_runner
-
-    runner_up_op = RunnerUpOp(runner_id=runner_id)
-
-    events: list[Event] = []
-    async for event in worker._execute_op(runner_up_op):  # type: ignore[misc]
-        events.append(event)
-
-    assert len(events) == 1
-    assert isinstance(events[0], RunnerStatusUpdated)
-    assert isinstance(events[0].runner_status, LoadedRunnerStatus)
-
-    # Is the runner actually running?
-    supervisor = next(iter(worker.assigned_runners.values())).runner
-    assert supervisor is not None
-    assert supervisor.healthy
-
-    full_response = ''
-
-    async for chunk in supervisor.stream_response(task=chat_completion_task(InstanceId(), TaskId())):
-        if isinstance(chunk, TokenChunk):
-            full_response += chunk.text
-
-    assert "42" in full_response.lower(), (
-        f"Expected '42' in response, but got: {full_response}"
-    )
-
-    runner = worker.assigned_runners[runner_id].runner
-    assert runner is not None
-    await runner.astop() # Neat cleanup.
-
-@pytest.mark.asyncio
-async def test_runner_down_op(worker_with_running_runner: tuple[Worker, RunnerId, Instance], tmp_path: Path):
-    worker, runner_id, _ = worker_with_running_runner
-
-    runner_down_op = RunnerDownOp(runner_id=runner_id)
-    events: list[Event] = []
-    async for event in worker._execute_op(runner_down_op):  # type: ignore[misc]
-        events.append(event)
-
-    assert len(events) == 1
-    assert isinstance(events[0], RunnerStatusUpdated)
-    assert isinstance(events[0].runner_status, ReadyRunnerStatus)
-
-@pytest.mark.asyncio
-async def test_download_op(worker_with_assigned_runner: tuple[Worker, RunnerId, Instance], tmp_path: Path):
-    worker, runner_id, instance_obj = worker_with_assigned_runner
-
-    print(f'{worker.assigned_runners=}')
-
-    download_op = DownloadOp(
-        instance_id=instance_obj.instance_id,
-        runner_id=runner_id,
-        shard_metadata=instance_obj.shard_assignments.runner_to_shard[runner_id],
-        hosts=instance_obj.hosts,
-    )
-
-    events: list[Event] = []
-
-    async for event in worker._execute_op(download_op):  # type: ignore[misc]
-        events.append(event)
-
-    # Should give download status and then a final download status with DownloadCompleted
-    print(events)
-
-@pytest.mark.asyncio
-async def test_execute_task_op(
-    worker_with_running_runner: tuple[Worker, RunnerId, Instance], 
-    chat_completion_task: Callable[[InstanceId, TaskId], Task], tmp_path: Path):
-    worker, runner_id, _ = worker_with_running_runner
-
-    execute_task_op = ExecuteTaskOp(
-        runner_id=runner_id,
-        task=chat_completion_task(InstanceId(), TaskId())
-    )
-
-    events: list[Event] = []
-    async for event in worker._execute_op(execute_task_op): # type: ignore[misc]
-        events.append(event)
-
-    assert len(events) > 20
-
-    print(f'{events=}')    
-
-
-    assert isinstance(events[0], RunnerStatusUpdated)
-    assert isinstance(events[0].runner_status, RunningRunnerStatus)
-
-    assert isinstance(events[1], TaskStateUpdated)
-    assert events[1].task_status == TaskStatus.RUNNING # It tried to start.
-
-    assert isinstance(events[-2], TaskStateUpdated)
-    assert events[-2].task_status == TaskStatus.COMPLETE # It tried to start.
-
-    assert isinstance(events[-1], RunnerStatusUpdated)
-    assert isinstance(events[-1].runner_status, LoadedRunnerStatus) # It should not have failed.
-
-    gen_events: list[ChunkGenerated] = [x for x in events if isinstance(x, ChunkGenerated)]
-    text_chunks: list[TokenChunk] = [x.chunk for x in gen_events if isinstance(x.chunk, TokenChunk)]
-    assert len(text_chunks) == len(events) - 4
-    
-    output_text = ''.join([x.text for x in text_chunks])
-    assert '42' in output_text
-
-    runner = worker.assigned_runners[runner_id].runner
-    assert runner is not None
-    await runner.astop() # Neat cleanup.
-
-@pytest.mark.asyncio
-async def test_execute_task_fails(
-    worker_with_running_runner: tuple[Worker, RunnerId, Instance], 
-    chat_completion_task: Callable[[InstanceId, TaskId], Task], tmp_path: Path):
-    worker, runner_id, _ = worker_with_running_runner
-
-    task = chat_completion_task(InstanceId(), TaskId())
-    messages = task.task_params.messages
-    messages[0].content = 'Artificial prompt: EXO RUNNER MUST FAIL'
-
-    execute_task_op = ExecuteTaskOp(
-        runner_id=runner_id,
-        task=task
-    )
-
-    events: list[Event] = []
-    async for event in worker._execute_op(execute_task_op): # type: ignore[misc]
-        events.append(event)
-
-    assert len(events) == 5
-
-    print(events)    
-
-    assert isinstance(events[0], RunnerStatusUpdated)
-    assert isinstance(events[0].runner_status, RunningRunnerStatus) # It tried to start.
-
-    assert isinstance(events[1], TaskStateUpdated)
-    assert events[1].task_status == TaskStatus.RUNNING # It tried to start.
-
-    assert isinstance(events[2], TaskStateUpdated)
-    assert events[2].task_status == TaskStatus.FAILED # Task marked as failed. 
-
-    assert isinstance(events[3], TaskFailed)
-
-    assert isinstance(events[4], RunnerStatusUpdated)
-    assert isinstance(events[4].runner_status, FailedRunnerStatus) # It should have failed.
\ No newline at end of file
diff --git a/worker/tests/test_worker_plan.py b/worker/tests/test_worker_plan.py
deleted file mode 100644
index 040d47ee..00000000
--- a/worker/tests/test_worker_plan.py
+++ /dev/null
@@ -1,913 +0,0 @@
-from __future__ import annotations
-
-import logging
-import tempfile
-from pathlib import Path
-
-import pytest
-
-from shared.types.api import ChatCompletionMessage
-from shared.types.state import State
-from shared.types.tasks import (
-    ChatCompletionTask,
-    ChatCompletionTaskParams,
-    TaskStatus,
-    TaskType,
-)
-from shared.types.worker.common import NodeStatus
-from shared.types.worker.downloads import DownloadPending
-from shared.types.worker.instances import Instance, InstanceStatus
-from shared.types.worker.ops import (
-    AssignRunnerOp,
-    DownloadOp,
-    ExecuteTaskOp,
-    RunnerDownOp,
-    RunnerUpOp,
-    UnassignRunnerOp,
-)
-from shared.types.worker.runners import (
-    AssignedRunnerStatus,
-    DownloadingRunnerStatus,
-    FailedRunnerStatus,
-    LoadedRunnerStatus,
-    ReadyRunnerStatus,
-    RunningRunnerStatus,
-    ShardAssignments,
-)
-from shared.types.worker.shards import PipelineShardMetadata
-from worker.download.download_utils import build_model_path
-from worker.download.shard_downloader import NoopShardDownloader
-from worker.main import AssignedRunner, Worker
-
-from .test_worker_plan_utils import (
-    COMMAND_1_ID,
-    INSTANCE_1_ID,
-    MODEL_A_ID,
-    NODE_A,
-    NODE_B,
-    RUNNER_1_ID,
-    RUNNER_2_ID,
-    TASK_1_ID,
-    InProcessRunner,
-    PlanTestCase,
-    make_downloading_status,
-    make_model_meta,
-    make_shard_metadata,
-)
-
-"""
-The idea with these tests is to define declaratively the input and expected output of the worker.plan function.
-
-We initialize a Worker with InProcessRunners. We then construct a State which gets passed to Worker.plan.
-We then check what operation is returned by Worker.plan.
-"""
-
-def _get_test_cases(tmp_path: Path) -> list[PlanTestCase]:
-    # The `model_path` for `RUNNER_1_ID` must exist for the `DownloadOp` test case to pass validation.
-    (tmp_path / f"model_for_runner_{RUNNER_1_ID}").mkdir(exist_ok=True, parents=True)
-    model_a_meta = make_model_meta(MODEL_A_ID)
-    return [
-        PlanTestCase(
-            description="no runners -> no-op",
-            in_process_runners=[],
-            state=State(node_status={NODE_A: NodeStatus.Idle}, instances={}, runners={}),
-            expected_op=None,
-        ),
-
-        # I don't think this should ever happen, as if it's currently downloading then the worker loop will be blocked
-        # Potentially useful for future compatibility when worker becomes non-blocking
-        PlanTestCase(
-            description="runner state assigned, runner is assigned and downloading -> no-op",
-            in_process_runners=[
-                InProcessRunner(
-                    runner_id=RUNNER_1_ID,
-                    instance_id=INSTANCE_1_ID,
-                    model_id=MODEL_A_ID,
-                    status=make_downloading_status(NODE_A),
-                    downloaded=False,
-                )
-            ],
-            state=State(
-                node_status={NODE_A: NodeStatus.Idle},
-                instances={
-                    INSTANCE_1_ID: Instance(
-                        instance_type=InstanceStatus.INACTIVE,
-                        instance_id=INSTANCE_1_ID,
-                            shard_assignments=ShardAssignments(
-                                model_id=MODEL_A_ID,
-                                runner_to_shard={
-                                    RUNNER_1_ID: make_shard_metadata(device_rank=0, world_size=1)
-                                },
-                                node_to_runner={NODE_A: RUNNER_1_ID}
-                            ),
-                            hosts=[]
-                    )
-                },
-                runners={RUNNER_1_ID: make_downloading_status(NODE_A)},
-            ),
-            expected_op=None,
-        ),
-
-        PlanTestCase(
-            description="runner state downloading, runner is downloading -> no-op",
-            in_process_runners=[
-                InProcessRunner(
-                    runner_id=RUNNER_1_ID,
-                    instance_id=INSTANCE_1_ID,
-                    model_id=MODEL_A_ID,
-                    status=make_downloading_status(NODE_A),
-                    downloaded=False,
-                )
-            ],
-            state=State(
-                node_status={NODE_A: NodeStatus.Idle},
-                instances={
-                    INSTANCE_1_ID: Instance(
-                        instance_type=InstanceStatus.INACTIVE,
-                        instance_id=INSTANCE_1_ID,
-                            shard_assignments=ShardAssignments(
-                                model_id=MODEL_A_ID,
-                                runner_to_shard={
-                                    RUNNER_1_ID: make_shard_metadata(device_rank=0, world_size=1)
-                                },
-                                node_to_runner={NODE_A: RUNNER_1_ID}
-                            ),
-                            hosts=[]
-                    )
-                },
-                runners={RUNNER_1_ID: make_downloading_status(NODE_A)},
-            ),
-            expected_op=None,
-        ),
-
-        PlanTestCase(
-            description="ready runner, model present -> no-op",
-            in_process_runners=[
-                InProcessRunner(
-                    runner_id=RUNNER_1_ID,
-                    instance_id=INSTANCE_1_ID,
-                    model_id=MODEL_A_ID,
-                    status=ReadyRunnerStatus(),
-                    downloaded=True,
-                )
-            ],
-            state=State(
-                node_status={NODE_A: NodeStatus.Idle},
-                instances={
-                    INSTANCE_1_ID: Instance(
-                        instance_type=InstanceStatus.INACTIVE,
-                        instance_id=INSTANCE_1_ID,
-                            shard_assignments=ShardAssignments(
-                                model_id=MODEL_A_ID,
-                                runner_to_shard={
-                                    RUNNER_1_ID: make_shard_metadata(device_rank=0, world_size=1)
-                                },
-                                node_to_runner={NODE_A: RUNNER_1_ID}
-                            ),
-                            hosts=[]
-                    )
-                },
-                runners={RUNNER_1_ID: ReadyRunnerStatus()},
-            ),
-            expected_op=None,
-        ),
-
-        PlanTestCase(
-            description="runner assigned and not in state -> AssignRunnerOp",
-            in_process_runners=[],
-            state=State(
-                node_status={NODE_A: NodeStatus.Idle},
-                instances={
-                    INSTANCE_1_ID: Instance(
-                        instance_type=InstanceStatus.ACTIVE, # Either active or inactive should yield the same.
-                        instance_id=INSTANCE_1_ID,
-                            shard_assignments=ShardAssignments(
-                                model_id=MODEL_A_ID,
-                                runner_to_shard={
-                                    RUNNER_1_ID: make_shard_metadata(device_rank=0, world_size=1)
-                                },
-                                node_to_runner={NODE_A: RUNNER_1_ID}
-                            ),
-                            hosts=[]
-                    )
-                },
-                runners={RUNNER_1_ID: AssignedRunnerStatus()},
-            ),
-            expected_op=AssignRunnerOp(
-                instance_id=INSTANCE_1_ID,
-                runner_id=RUNNER_1_ID,
-                shard_metadata=PipelineShardMetadata(
-                    device_rank=0,
-                    world_size=1,
-                    model_meta=model_a_meta,
-                    start_layer=0,
-                    end_layer=1,
-                    n_layers=1,
-                ),
-                hosts=[]
-            ),
-        ),
-
-        PlanTestCase(
-            description="runner assigned but no longer in state -> UnassignRunnerOp",
-            in_process_runners=[
-                InProcessRunner(
-                    runner_id=RUNNER_1_ID,
-                    instance_id=INSTANCE_1_ID,
-                    model_id=MODEL_A_ID,
-                    status=AssignedRunnerStatus(),
-                    downloaded=False,
-                )
-            ],
-            state=State(node_status={NODE_A: NodeStatus.Idle}, instances={}, runners={}),
-            expected_op=UnassignRunnerOp(runner_id=RUNNER_1_ID),
-        ),
-
-        PlanTestCase(
-            description="runner state assigned, runner is assigned, not downloaded -> expect DownloadOp",
-            in_process_runners=[
-                InProcessRunner(
-                    runner_id=RUNNER_1_ID,
-                    instance_id=INSTANCE_1_ID,
-                    model_id=MODEL_A_ID,
-                    status=AssignedRunnerStatus(),
-                    downloaded=False,
-                )
-            ],
-            state=State(
-                node_status={NODE_A: NodeStatus.Idle},
-                instances={
-                    INSTANCE_1_ID: Instance(
-                        instance_type=InstanceStatus.ACTIVE,
-                        instance_id=INSTANCE_1_ID,
-                            shard_assignments=ShardAssignments(
-                                model_id=MODEL_A_ID,
-                                runner_to_shard={
-                                    RUNNER_1_ID: make_shard_metadata(device_rank=0, world_size=1)
-                                },
-                                node_to_runner={NODE_A: RUNNER_1_ID}
-                            ),
-                            hosts=[]
-                    )
-                },
-                runners={RUNNER_1_ID: AssignedRunnerStatus()},
-            ),
-            expected_op=DownloadOp(
-                runner_id=RUNNER_1_ID,
-                instance_id=INSTANCE_1_ID,
-                shard_metadata=PipelineShardMetadata(
-                    device_rank=0,
-                    world_size=1,
-                    model_meta=model_a_meta,
-                    start_layer=0,
-                    end_layer=1,
-                    n_layers=1,
-                ),
-                hosts=[],
-            ),
-        ),
-
-        PlanTestCase(
-            description="ready runner (and state up) -> expect RunnerUpOp",
-            in_process_runners=[
-                InProcessRunner(
-                    runner_id=RUNNER_1_ID,
-                    instance_id=INSTANCE_1_ID,
-                    model_id=MODEL_A_ID,
-                    status=ReadyRunnerStatus(),
-                    downloaded=True,
-                )
-            ],
-            state=State(
-                node_status={NODE_A: NodeStatus.Idle},
-                instances={
-                    INSTANCE_1_ID: Instance(
-                        instance_type=InstanceStatus.ACTIVE,
-                        instance_id=INSTANCE_1_ID,
-                            shard_assignments=ShardAssignments(
-                                model_id=MODEL_A_ID,
-                                runner_to_shard={
-                                    RUNNER_1_ID: make_shard_metadata(device_rank=0, world_size=1)
-                                },
-                                node_to_runner={NODE_A: RUNNER_1_ID}
-                            ),
-                            hosts=[]
-                    )
-                },
-                runners={RUNNER_1_ID: ReadyRunnerStatus()},
-                tasks={},
-            ),
-            expected_op=RunnerUpOp(runner_id=RUNNER_1_ID),
-        ),
-
-        PlanTestCase(
-            description="1 ready, 1 downloading (and state up) -> no-op",
-            in_process_runners=[
-                InProcessRunner(
-                    runner_id=RUNNER_1_ID,
-                    instance_id=INSTANCE_1_ID,
-                    model_id=MODEL_A_ID,
-                    status=ReadyRunnerStatus(),
-                    downloaded=True,
-                    device_rank=0,
-                ),
-                InProcessRunner(
-                    runner_id=RUNNER_2_ID,
-                    instance_id=INSTANCE_1_ID,
-                    model_id=MODEL_A_ID,
-                    status=DownloadingRunnerStatus(
-                        download_progress=DownloadPending(node_id=NODE_A)
-                    ),
-                    downloaded=False,
-                    device_rank=1,
-                ),
-            ],
-            state=State(
-                node_status={NODE_A: NodeStatus.Idle, NODE_B: NodeStatus.Idle},
-                instances={
-                    INSTANCE_1_ID: Instance(
-                        instance_type=InstanceStatus.ACTIVE,
-                        instance_id=INSTANCE_1_ID,
-                            shard_assignments=ShardAssignments(
-                                model_id=MODEL_A_ID,
-                                runner_to_shard={
-                                    RUNNER_1_ID: make_shard_metadata(device_rank=0, world_size=2),
-                                    RUNNER_2_ID: make_shard_metadata(device_rank=1, world_size=2)
-                                },
-                                node_to_runner={NODE_A: RUNNER_1_ID, NODE_B: RUNNER_2_ID}
-                            ),
-                            hosts=[]
-                    )
-                },
-                runners={RUNNER_1_ID: ReadyRunnerStatus(), RUNNER_2_ID: DownloadingRunnerStatus(download_progress=DownloadPending(node_id=NODE_A))},
-                tasks={TASK_1_ID: ChatCompletionTask(task_id=TASK_1_ID, command_id=COMMAND_1_ID, task_type=TaskType.CHAT_COMPLETION, task_status=TaskStatus.PENDING, task_params=ChatCompletionTaskParams(model=str(MODEL_A_ID), messages=[ChatCompletionMessage(role="user", content="Hello, world!")]), instance_id=INSTANCE_1_ID)},
-            ),
-            expected_op=None
-        ),
-
-        PlanTestCase(
-            description="2 ready runners (and state up) -> expect RunnerUpOp",
-            in_process_runners=[
-                InProcessRunner(
-                    runner_id=RUNNER_1_ID,
-                    instance_id=INSTANCE_1_ID,
-                    model_id=MODEL_A_ID,
-                    status=ReadyRunnerStatus(),
-                    downloaded=True,
-                    device_rank=0,
-                ),
-                InProcessRunner(
-                    runner_id=RUNNER_2_ID,
-                    instance_id=INSTANCE_1_ID,
-                    model_id=MODEL_A_ID,
-                    status=ReadyRunnerStatus(),
-                    downloaded=True,
-                    device_rank=1,
-                ),
-            ],
-            state=State(
-                node_status={NODE_A: NodeStatus.Idle, NODE_B: NodeStatus.Idle},
-                instances={
-                    INSTANCE_1_ID: Instance(
-                        instance_type=InstanceStatus.ACTIVE,
-                        instance_id=INSTANCE_1_ID,
-                            shard_assignments=ShardAssignments(
-                                model_id=MODEL_A_ID,
-                                runner_to_shard={
-                                    RUNNER_1_ID: make_shard_metadata(device_rank=0, world_size=2),
-                                    RUNNER_2_ID: make_shard_metadata(device_rank=1, world_size=2)
-                                },
-                                node_to_runner={NODE_A: RUNNER_1_ID, NODE_B: RUNNER_2_ID}
-                            ),
-                            hosts=[]
-                    )
-                },
-                runners={RUNNER_1_ID: ReadyRunnerStatus(), RUNNER_2_ID: ReadyRunnerStatus()},
-                tasks={TASK_1_ID: ChatCompletionTask(task_id=TASK_1_ID, command_id=COMMAND_1_ID, task_type=TaskType.CHAT_COMPLETION, task_status=TaskStatus.PENDING, task_params=ChatCompletionTaskParams(model=str(MODEL_A_ID), messages=[ChatCompletionMessage(role="user", content="Hello, world!")]), instance_id=INSTANCE_1_ID)},
-            ),
-            expected_op=RunnerUpOp(runner_id=RUNNER_1_ID)
-        ),
-
-        PlanTestCase(
-            description="loaded runner (and state down) -> expect RunnerDownOp",
-            in_process_runners=[
-                InProcessRunner(
-                    runner_id=RUNNER_1_ID,
-                    instance_id=INSTANCE_1_ID,
-                    model_id=MODEL_A_ID,
-                    status=LoadedRunnerStatus(),
-                    downloaded=True,
-                )
-            ],
-            state=State(
-                node_status={NODE_A: NodeStatus.Idle},
-                instances={
-                    INSTANCE_1_ID: Instance(
-                        instance_type=InstanceStatus.INACTIVE,
-                        instance_id=INSTANCE_1_ID,
-                            shard_assignments=ShardAssignments(
-                                model_id=MODEL_A_ID,
-                                runner_to_shard={
-                                    RUNNER_1_ID: make_shard_metadata(device_rank=0, world_size=1)
-                                },
-                                node_to_runner={NODE_A: RUNNER_1_ID}
-                            ),
-                            hosts=[]
-                    )
-                },
-                runners={RUNNER_1_ID: LoadedRunnerStatus()},
-                tasks={},
-            ),
-            expected_op=RunnerDownOp(runner_id=RUNNER_1_ID),
-        ),
-
-        PlanTestCase(
-            description="failed runner (and state down) -> expect RunnerDownOp",
-            in_process_runners=[
-                InProcessRunner(
-                    runner_id=RUNNER_1_ID,
-                    instance_id=INSTANCE_1_ID,
-                    model_id=MODEL_A_ID,
-                    status=FailedRunnerStatus(),
-                    downloaded=True,
-                )
-            ],
-            state=State(
-                node_status={NODE_A: NodeStatus.Idle},
-                instances={
-                    INSTANCE_1_ID: Instance(
-                        instance_type=InstanceStatus.INACTIVE,
-                        instance_id=INSTANCE_1_ID,
-                            shard_assignments=ShardAssignments(
-                                model_id=MODEL_A_ID,
-                                runner_to_shard={
-                                    RUNNER_1_ID: make_shard_metadata(device_rank=0, world_size=1)
-                                },
-                                node_to_runner={NODE_A: RUNNER_1_ID}
-                            ),
-                            hosts=[]
-                    )
-                },
-                runners={RUNNER_1_ID: FailedRunnerStatus()},
-                tasks={},
-            ),
-            expected_op=RunnerDownOp(runner_id=RUNNER_1_ID),
-        ),
-
-        PlanTestCase(
-            description="loaded runner, model present, task pending -> expect ExecuteTaskOp",
-            in_process_runners=[
-                InProcessRunner(
-                    runner_id=RUNNER_1_ID,
-                    instance_id=INSTANCE_1_ID,
-                    model_id=MODEL_A_ID,
-                    status=LoadedRunnerStatus(),
-                    downloaded=True,
-                )
-            ],
-            state=State(
-                node_status={NODE_A: NodeStatus.Idle},
-                instances={
-                    INSTANCE_1_ID: Instance(
-                        instance_type=InstanceStatus.ACTIVE,
-                        instance_id=INSTANCE_1_ID,
-                            shard_assignments=ShardAssignments(
-                                model_id=MODEL_A_ID,
-                                runner_to_shard={
-                                    RUNNER_1_ID: make_shard_metadata(device_rank=0, world_size=1)
-                                },
-                                node_to_runner={NODE_A: RUNNER_1_ID}
-                            ),
-                            hosts=[]
-                    )
-                },
-                runners={RUNNER_1_ID: LoadedRunnerStatus()},
-                tasks={
-                    TASK_1_ID: ChatCompletionTask(
-                        task_id=TASK_1_ID,
-                        command_id=COMMAND_1_ID,
-                        task_type=TaskType.CHAT_COMPLETION,
-                        task_status=TaskStatus.PENDING,
-                        task_params=ChatCompletionTaskParams(
-                            model=str(MODEL_A_ID),
-                            messages=[
-                                ChatCompletionMessage(
-                                    role="user",
-                                    content="Hello, world!"
-                                )
-                            ]
-                        ),
-                        instance_id=INSTANCE_1_ID
-                    )
-                },
-            ),
-            expected_op=ExecuteTaskOp(runner_id=RUNNER_1_ID, task=ChatCompletionTask(
-                task_id=TASK_1_ID,
-                command_id=COMMAND_1_ID,
-                instance_id=INSTANCE_1_ID,
-                task_type=TaskType.CHAT_COMPLETION,
-                task_status=TaskStatus.PENDING,
-                task_params=ChatCompletionTaskParams(
-                    model=str(MODEL_A_ID),
-                    messages=[ChatCompletionMessage(role="user", content="Hello, world!")]
-                ),
-            )),
-        ),
-
-        PlanTestCase(
-            # We should only run rank 0 once all other ranks are running.
-            description="two loaded runners & task, i'm rank 0 -> no-op",
-            in_process_runners=[
-                InProcessRunner(
-                    runner_id=RUNNER_1_ID,
-                    instance_id=INSTANCE_1_ID,
-                    model_id=MODEL_A_ID,
-                    status=LoadedRunnerStatus(),
-                    downloaded=True,
-                    device_rank=0,
-                ),
-                InProcessRunner(
-                    runner_id=RUNNER_2_ID,
-                    instance_id=INSTANCE_1_ID,
-                    model_id=MODEL_A_ID,
-                    status=LoadedRunnerStatus(),
-                    downloaded=True,
-                    device_rank=1,
-                ),
-            ],
-            state=State(
-                node_status={NODE_A: NodeStatus.Idle, NODE_B: NodeStatus.Idle},
-                instances={
-                    INSTANCE_1_ID: Instance(
-                        instance_type=InstanceStatus.ACTIVE,
-                        instance_id=INSTANCE_1_ID,
-                            shard_assignments=ShardAssignments(
-                                model_id=MODEL_A_ID,
-                                runner_to_shard={
-                                    RUNNER_1_ID: make_shard_metadata(device_rank=0, world_size=2),
-                                    RUNNER_2_ID: make_shard_metadata(device_rank=1, world_size=2)
-                                },
-                                node_to_runner={NODE_A: RUNNER_1_ID, NODE_B: RUNNER_2_ID}
-                            ),
-                            hosts=[]
-                    )
-                },
-                runners={RUNNER_1_ID: LoadedRunnerStatus(), RUNNER_2_ID: LoadedRunnerStatus()},
-                tasks={TASK_1_ID: ChatCompletionTask(task_id=TASK_1_ID, command_id=COMMAND_1_ID, task_type=TaskType.CHAT_COMPLETION, task_status=TaskStatus.PENDING, task_params=ChatCompletionTaskParams(model=str(MODEL_A_ID), messages=[ChatCompletionMessage(role="user", content="Hello, world!")]), instance_id=INSTANCE_1_ID)},
-            ),
-            expected_op=None
-        ),
-
-        PlanTestCase(
-            description="two loaded runners & task, i'm rank 1 -> expect ExecuteTaskOp on rank 1",
-            in_process_runners=[
-                InProcessRunner(
-                    runner_id=RUNNER_1_ID,
-                    instance_id=INSTANCE_1_ID,
-                    model_id=MODEL_A_ID,
-                    status=LoadedRunnerStatus(),
-                    downloaded=True,
-                    device_rank=1,
-                ),
-                InProcessRunner(
-                    runner_id=RUNNER_2_ID,
-                    instance_id=INSTANCE_1_ID,
-                    model_id=MODEL_A_ID,
-                    status=LoadedRunnerStatus(),
-                    downloaded=True,
-                    device_rank=0,
-                ),
-            ],
-            state=State(
-                node_status={NODE_A: NodeStatus.Idle, NODE_B: NodeStatus.Idle},
-                instances={
-                    INSTANCE_1_ID: Instance(
-                        instance_type=InstanceStatus.ACTIVE,
-                        instance_id=INSTANCE_1_ID,
-                            shard_assignments=ShardAssignments(
-                                model_id=MODEL_A_ID,
-                                runner_to_shard={
-                                    RUNNER_1_ID: make_shard_metadata(device_rank=1, world_size=2),
-                                    RUNNER_2_ID: make_shard_metadata(device_rank=0, world_size=2)
-                                },
-                                node_to_runner={NODE_A: RUNNER_1_ID, NODE_B: RUNNER_2_ID}
-                            ),
-                            hosts=[]
-                    )
-                },
-                runners={RUNNER_1_ID: LoadedRunnerStatus(), RUNNER_2_ID: LoadedRunnerStatus()},
-                tasks={TASK_1_ID: ChatCompletionTask(task_id=TASK_1_ID, command_id=COMMAND_1_ID, task_type=TaskType.CHAT_COMPLETION, task_status=TaskStatus.PENDING, task_params=ChatCompletionTaskParams(model=str(MODEL_A_ID), messages=[ChatCompletionMessage(role="user", content="Hello, world!")]), instance_id=INSTANCE_1_ID)},
-            ),
-            expected_op=ExecuteTaskOp(
-                runner_id=RUNNER_1_ID,
-                task=ChatCompletionTask(
-                    task_id=TASK_1_ID,
-                    command_id=COMMAND_1_ID,
-                    instance_id=INSTANCE_1_ID,
-                    task_type=TaskType.CHAT_COMPLETION,
-                    task_params=ChatCompletionTaskParams(
-                        model=str(MODEL_A_ID),
-                        messages=[ChatCompletionMessage(role="user", content="Hello, world!")],
-                    ),
-                    task_status=TaskStatus.PENDING,
-                ),
-            ),
-        ),
-
-        PlanTestCase(
-            description="rank 1 loaded, rank 0 ready, i'm rank 0  -> expect ExecuteTaskOp on rank 0",
-            in_process_runners=[
-                InProcessRunner(
-                    runner_id=RUNNER_1_ID,
-                    instance_id=INSTANCE_1_ID,
-                    model_id=MODEL_A_ID,
-                    status=LoadedRunnerStatus(),
-                    downloaded=True,
-                    device_rank=0,
-                ),
-                InProcessRunner(
-                    runner_id=RUNNER_2_ID,
-                    instance_id=INSTANCE_1_ID,
-                    model_id=MODEL_A_ID,
-                    status=RunningRunnerStatus(),
-                    downloaded=True,
-                    device_rank=1,
-                ),
-            ],
-            state=State(
-                node_status={NODE_A: NodeStatus.Idle, NODE_B: NodeStatus.Running},
-                instances={
-                    INSTANCE_1_ID: Instance(
-                        instance_type=InstanceStatus.ACTIVE,
-                        instance_id=INSTANCE_1_ID,
-                            shard_assignments=ShardAssignments(
-                                model_id=MODEL_A_ID,
-                                runner_to_shard={
-                                    RUNNER_1_ID: make_shard_metadata(device_rank=0, world_size=2),
-                                    RUNNER_2_ID: make_shard_metadata(device_rank=1, world_size=2)
-                                },
-                                node_to_runner={NODE_A: RUNNER_1_ID, NODE_B: RUNNER_2_ID}
-                            ),
-                            hosts=[]
-                    )
-                },
-                runners={RUNNER_1_ID: LoadedRunnerStatus(), RUNNER_2_ID: RunningRunnerStatus()},
-                tasks={TASK_1_ID: ChatCompletionTask(task_id=TASK_1_ID, command_id=COMMAND_1_ID, task_type=TaskType.CHAT_COMPLETION, task_status=TaskStatus.PENDING, task_params=ChatCompletionTaskParams(model=str(MODEL_A_ID), messages=[ChatCompletionMessage(role="user", content="Hello, world!")]), instance_id=INSTANCE_1_ID)},
-            ),
-            expected_op=ExecuteTaskOp(
-                runner_id=RUNNER_1_ID,
-                task=ChatCompletionTask(
-                    task_id=TASK_1_ID,
-                    command_id=COMMAND_1_ID,
-                    instance_id=INSTANCE_1_ID,
-                    task_type=TaskType.CHAT_COMPLETION,
-                    task_params=ChatCompletionTaskParams(
-                        model=str(MODEL_A_ID),
-                        messages=[ChatCompletionMessage(role="user", content="Hello, world!")],
-                    ),
-                    task_status=TaskStatus.PENDING,
-                ),
-            ),
-        ),
-
-        PlanTestCase(
-            description="other runner failed -> RunnerDownOp",
-            in_process_runners=[
-                InProcessRunner(
-                    runner_id=RUNNER_1_ID,
-                    instance_id=INSTANCE_1_ID,
-                    model_id=MODEL_A_ID,
-                    status=LoadedRunnerStatus(),
-                    downloaded=True,
-                    device_rank=0,
-                ),
-                InProcessRunner(
-                    runner_id=RUNNER_2_ID,
-                    instance_id=INSTANCE_1_ID,
-                    model_id=MODEL_A_ID,
-                    status=FailedRunnerStatus(),
-                    downloaded=True,
-                    device_rank=1,
-                ),
-            ],
-            state=State(
-                node_status={NODE_A: NodeStatus.Idle, NODE_B: NodeStatus.Idle},
-                instances={
-                    INSTANCE_1_ID: Instance(
-                        instance_type=InstanceStatus.ACTIVE,
-                        instance_id=INSTANCE_1_ID,
-                            shard_assignments=ShardAssignments(
-                                model_id=MODEL_A_ID,
-                                runner_to_shard={
-                                    RUNNER_1_ID: make_shard_metadata(device_rank=0, world_size=2),
-                                    RUNNER_2_ID: make_shard_metadata(device_rank=1, world_size=2)
-                                },
-                                node_to_runner={NODE_A: RUNNER_1_ID, NODE_B: RUNNER_2_ID}
-                            ),
-                            hosts=[]
-                    )
-                },
-                runners={RUNNER_1_ID: LoadedRunnerStatus(), RUNNER_2_ID: FailedRunnerStatus()},
-            ),
-            expected_op=RunnerDownOp(runner_id=RUNNER_1_ID)
-        ),
-
-        PlanTestCase(
-            description="this runner failed (1 node) -> RunnerDownOp",
-            in_process_runners=[
-                InProcessRunner(
-                    runner_id=RUNNER_1_ID,
-                    instance_id=INSTANCE_1_ID,
-                    model_id=MODEL_A_ID,
-                    status=FailedRunnerStatus(),
-                    downloaded=True,
-                    device_rank=0,
-                ),
-            ],
-            state=State(
-                node_status={NODE_A: NodeStatus.Idle, NODE_B: NodeStatus.Idle},
-                instances={
-                    INSTANCE_1_ID: Instance(
-                        instance_type=InstanceStatus.ACTIVE,
-                        instance_id=INSTANCE_1_ID,
-                            shard_assignments=ShardAssignments(
-                                model_id=MODEL_A_ID,
-                                runner_to_shard={
-                                    RUNNER_1_ID: make_shard_metadata(device_rank=0, world_size=1),
-                                },
-                                node_to_runner={NODE_A: RUNNER_1_ID}
-                            ),
-                            hosts=[]
-                    )
-                },
-                runners={RUNNER_1_ID: FailedRunnerStatus()},
-            ),
-            expected_op=RunnerDownOp(runner_id=RUNNER_1_ID)
-        ),
-
-
-        PlanTestCase(
-            description="this runner failed (2 nodes) -> no-op",
-            in_process_runners=[
-                InProcessRunner(
-                    runner_id=RUNNER_1_ID,
-                    instance_id=INSTANCE_1_ID,
-                    model_id=MODEL_A_ID,
-                    status=FailedRunnerStatus(),
-                    downloaded=True,
-                    device_rank=0,
-                ),
-                InProcessRunner(
-                    runner_id=RUNNER_2_ID,
-                    instance_id=INSTANCE_1_ID,
-                    model_id=MODEL_A_ID,
-                    status=LoadedRunnerStatus(),
-                    downloaded=True,
-                    device_rank=1,
-                ),
-            ],
-            state=State(
-                node_status={NODE_A: NodeStatus.Idle, NODE_B: NodeStatus.Idle},
-                instances={
-                    INSTANCE_1_ID: Instance(
-                        instance_type=InstanceStatus.ACTIVE,
-                        instance_id=INSTANCE_1_ID,
-                            shard_assignments=ShardAssignments(
-                                model_id=MODEL_A_ID,
-                                runner_to_shard={
-                                    RUNNER_1_ID: make_shard_metadata(device_rank=0, world_size=2),
-                                    RUNNER_2_ID: make_shard_metadata(device_rank=1, world_size=2)
-                                },
-                                node_to_runner={NODE_A: RUNNER_1_ID, NODE_B: RUNNER_2_ID}
-                            ),
-                            hosts=[]
-                    )
-                },
-                runners={RUNNER_1_ID: FailedRunnerStatus(), RUNNER_2_ID: LoadedRunnerStatus()},
-            ),
-            expected_op=None
-        ),
-
-        PlanTestCase(
-            description="this node failed, other node spun down -> RunnerDownOp",
-            in_process_runners=[
-                InProcessRunner(
-                    runner_id=RUNNER_1_ID,
-                    instance_id=INSTANCE_1_ID,
-                    model_id=MODEL_A_ID,
-                    status=FailedRunnerStatus(),
-                    downloaded=True,
-                    device_rank=0,
-                ),
-                InProcessRunner(
-                    runner_id=RUNNER_2_ID,
-                    instance_id=INSTANCE_1_ID,
-                    model_id=MODEL_A_ID,
-                    status=ReadyRunnerStatus(),
-                    downloaded=True,
-                    device_rank=1,
-                ),
-            ],
-            state=State(
-                node_status={NODE_A: NodeStatus.Idle, NODE_B: NodeStatus.Idle},
-                instances={
-                    INSTANCE_1_ID: Instance(
-                        instance_type=InstanceStatus.ACTIVE,
-                        instance_id=INSTANCE_1_ID,
-                        shard_assignments=ShardAssignments(
-                            model_id=MODEL_A_ID,
-                            runner_to_shard={
-                                RUNNER_1_ID: make_shard_metadata(device_rank=0, world_size=2),
-                                RUNNER_2_ID: make_shard_metadata(device_rank=1, world_size=2)
-                            },
-                            node_to_runner={NODE_A: RUNNER_1_ID, NODE_B: RUNNER_2_ID}
-                        ),
-                        hosts=[]
-                    )
-                },
-                runners={RUNNER_1_ID: FailedRunnerStatus(), RUNNER_2_ID: ReadyRunnerStatus()},
-            ),
-            expected_op=RunnerDownOp(runner_id=RUNNER_1_ID)
-        ),
-
-    ]
-
-
-# ---------------------------------------------------------------------------
-# Parametrised test
-# ---------------------------------------------------------------------------
-
-
-# Pre-compute readable identifiers for each case to avoid lambda typing issues.
-@pytest.mark.parametrize(
-    "case",
-    # We use a factory to delay test case generation until tmp_path is available.
-    [pytest.param(c, id=c.id()) for c in _get_test_cases(Path(tempfile.TemporaryDirectory().name))],
-)
-def test_worker_plan(case: PlanTestCase, tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
-    """Exercise Worker.plan across declarative scenarios."""
-
-    print(f"----- case: {case.description}")
-
-    # Regenerate test cases with the actual tmp_path fixture
-    test_cases = {c.description: c for c in _get_test_cases(tmp_path)}
-    case = test_cases[case.description]
-
-    node_id = NODE_A
-
-    logger = logging.getLogger("test_worker_plan")
-    shard_downloader = NoopShardDownloader()
-    worker = Worker(node_id=node_id, shard_downloader=shard_downloader, worker_events=None, global_events=None, logger=logger)
-
-    path_downloaded_map: dict[str, bool] = {}
-
-    runner_config: InProcessRunner
-    for runner_config in case.in_process_runners:
-        
-        model_path = tmp_path / f"model_for_runner_{runner_config.runner_id}"
-        model_path.mkdir(exist_ok=True, parents=True)
-
-        if len(case.state.instances) == 1: 
-            instance_id = next(iter(case.state.instances))
-
-            shard_assignments = case.state.instances[instance_id].shard_assignments
-            shard_metadata = shard_assignments.runner_to_shard[runner_config.runner_id]
-            
-            # Only add this runner if it belongs to our node
-            runner_node = None
-            for node, runner in shard_assignments.node_to_runner.items():
-                if runner == runner_config.runner_id:
-                    runner_node = node
-                    break
-            
-            if runner_node != node_id:
-                # This runner belongs to a different node, skip it
-                continue
-                
-        elif len(case.state.instances) == 0:
-            shard_metadata = PipelineShardMetadata(
-                device_rank=runner_config.device_rank,
-                world_size=1,
-                model_meta=make_model_meta(runner_config.model_id),
-                start_layer=0,
-                end_layer=1,
-                n_layers=1,
-            )
-        else:
-            raise Exception('test_worker_plan not currently designed to have more than 1 instance.')
-
-
-        assigned_runner = AssignedRunner(
-            runner_id=runner_config.runner_id,
-            instance_id=runner_config.instance_id,
-            shard_metadata=shard_metadata,
-            hosts=[],
-            status=runner_config.status,
-            runner=None,
-            is_downloaded=runner_config.downloaded
-        )
-        worker.assigned_runners[runner_config.runner_id] = assigned_runner
-        path_downloaded_map[str(build_model_path(shard_metadata.model_meta.model_id))] = runner_config.downloaded
-
-    op = worker.plan(case.state)
-    assert op == case.expected_op
diff --git a/worker/tests/test_worker_plan_utils.py b/worker/tests/test_worker_plan_utils.py
deleted file mode 100644
index 84d92ab0..00000000
--- a/worker/tests/test_worker_plan_utils.py
+++ /dev/null
@@ -1,195 +0,0 @@
-from __future__ import annotations
-
-from dataclasses import dataclass
-from pathlib import Path
-from typing import Final, List, Optional
-
-from shared.models.model_cards import MODEL_CARDS, ModelCard
-from shared.types.common import CommandId, NodeId
-from shared.types.models import ModelId, ModelMetadata
-from shared.types.state import State
-from shared.types.tasks import TaskId
-from shared.types.worker.common import InstanceId, NodeStatus, RunnerId
-from shared.types.worker.downloads import DownloadOngoing, DownloadProgressData
-from shared.types.worker.instances import Instance, InstanceStatus
-from shared.types.worker.ops import RunnerOp
-from shared.types.worker.runners import (
-    AssignedRunnerStatus,
-    DownloadingRunnerStatus,
-    RunnerStatus,
-    ShardAssignments,
-)
-from shared.types.worker.shards import PipelineShardMetadata
-
-NODE_A: Final[NodeId] = NodeId("aaaaaaaa-aaaa-4aaa-8aaa-aaaaaaaaaaaa")
-NODE_B: Final[NodeId] = NodeId("bbbbbbbb-bbbb-4bbb-8bbb-bbbbbbbbbbbb")
-
-# Define constant IDs for deterministic test cases
-RUNNER_1_ID: Final[RunnerId] = RunnerId("cccccccc-aaaa-4aaa-8aaa-aaaaaaaaaaaa")
-INSTANCE_1_ID: Final[InstanceId] = InstanceId()
-RUNNER_2_ID: Final[RunnerId] = RunnerId("dddddddd-aaaa-4aaa-8aaa-aaaaaaaaaaaa")
-INSTANCE_2_ID: Final[InstanceId] = InstanceId()
-MODEL_A_ID: Final[ModelId] = 'mlx-community/Llama-3.2-1B-Instruct-4bit'
-MODEL_B_ID: Final[ModelId] = 'mlx-community/Llama-3.2-1B-Instruct-4bit'
-TASK_1_ID: Final[TaskId] = TaskId()
-COMMAND_1_ID: Final[CommandId] = CommandId()
-
-@dataclass(slots=True, frozen=True)
-class InProcessRunner:
-    """Minimal description of a runner's in-process state."""
-
-    runner_id: RunnerId
-    instance_id: InstanceId
-    model_id: ModelId
-    status: RunnerStatus
-    downloaded: bool
-    device_rank: int = 0
-
-
-@dataclass(slots=True, frozen=True)
-class PlanTestCase:
-    """Table-driven description of an entire planning scenario."""
-
-    description: str
-    state: State
-    in_process_runners: List[InProcessRunner]
-    expected_op: Optional[RunnerOp]
-
-    def id(self) -> str:  # noqa: D401
-        return self.description.replace(" ", "_")
-
-
-def make_shard_metadata(device_rank: int, world_size: int, model_id: ModelId = MODEL_A_ID) -> PipelineShardMetadata:
-    """Create PipelineShardMetadata with proper layer assignments based on device_rank and world_size."""
-    total_layers = world_size  # For simplicity in tests, total_layers = world_size
-    
-    if world_size == 1:
-        start_layer = 0
-        end_layer = 1
-        n_layers = 1
-    else:
-        # For multi-device setup, each device gets one layer
-        start_layer = device_rank
-        end_layer = device_rank + 1
-        n_layers = total_layers
-    
-    return PipelineShardMetadata(
-        device_rank=device_rank,
-        world_size=world_size,
-        model_meta=make_model_meta(model_id),
-        start_layer=start_layer,
-        end_layer=end_layer,
-        n_layers=n_layers,
-    )
-
-
-def make_downloading_status(node_id: NodeId) -> DownloadingRunnerStatus:
-    """Factory for a *Downloading* status with placeholder progress."""
-    return DownloadingRunnerStatus(
-        download_progress=DownloadOngoing(
-            node_id=node_id,
-            download_progress=DownloadProgressData(total_bytes=1, downloaded_bytes=0),
-        )
-    )
-
-def make_model_meta(
-    model_id: str
-) -> ModelMetadata:
-    model_card: ModelCard
-    for card in MODEL_CARDS.values():
-        if card.model_id == model_id:
-            model_card = card
-
-            return ModelMetadata(
-                model_id=model_id,
-                pretty_name=model_card.model_id,
-                storage_size_kilobytes=10**6,
-                n_layers=16,
-            )
-    
-    raise Exception(f'Unknown model_id passed: {model_id}')
-
-    ## Alternatively, if we are ok for this method to be async:
-    # await _get_model_meta(model_id)
-
-
-def create_worker_state(
-    *,
-    node_id: NodeId,
-    runner_configs: list[tuple[RunnerId, InstanceId, ModelId]],
-    tmp_path: Path,
-) -> State:
-    """Create a test `State` based on a list of runner configurations."""
-    instances: dict[InstanceId, Instance] = {}
-    for runner_id, instance_id, model_id in runner_configs:
-        model_path = tmp_path / f"model_for_runner_{runner_id}"
-        model_path.mkdir(exist_ok=True, parents=True)
-
-        shard_metadata = PipelineShardMetadata(
-            device_rank=0,
-            world_size=1,
-            model_meta=make_model_meta(model_id),
-            start_layer=0,
-            end_layer=1,
-            n_layers=1,
-        )
-        shard_assignments = ShardAssignments(
-            model_id=model_id,
-            runner_to_shard={runner_id: shard_metadata},
-            node_to_runner={node_id: runner_id},
-        )
-        instance = Instance(
-            instance_id=instance_id,
-            instance_type=InstanceStatus.ACTIVE,
-            shard_assignments=shard_assignments,
-            hosts=[],
-        )
-        instances[instance_id] = instance
-
-    return State(
-        node_status={node_id: NodeStatus.Idle},
-        instances=instances,
-        runners={runner_id: AssignedRunnerStatus() for runner_id, _, _ in runner_configs},
-        tasks={},
-    )
-
-
-def make_instance(
-    instance_id: InstanceId,
-    model_id: ModelId,
-    tmp_path: Path,
-    runner_specs: list[tuple[RunnerId, NodeId, int]],
-) -> Instance:
-    """Creates an instance with one or more runners."""
-    runner_to_shard: dict[RunnerId, PipelineShardMetadata] = {}
-    node_to_runner: dict[NodeId, RunnerId] = {}
-    world_size = len(runner_specs)
-
-    for runner_id, node_id, device_rank in runner_specs:
-        model_path = tmp_path / f"model_for_runner_{runner_id}"
-        model_path.mkdir(exist_ok=True, parents=True)
-
-        shard_metadata = PipelineShardMetadata(
-            device_rank=device_rank,
-            world_size=world_size,
-            model_meta=make_model_meta(model_id),
-            start_layer=0,
-            end_layer=1,
-            n_layers=1,
-        )
-        runner_to_shard[runner_id] = shard_metadata
-        node_to_runner[node_id] = runner_id
-
-    shard_assignments = ShardAssignments(
-        model_id=model_id,
-        runner_to_shard=runner_to_shard,
-        node_to_runner=node_to_runner,
-    )
-    return Instance(
-        instance_id=instance_id,
-        instance_type=InstanceStatus.ACTIVE,
-        shard_assignments=shard_assignments,
-        hosts=[],
-    )
-
-### For worker plan tests
\ No newline at end of file
diff --git a/worker/worker.py b/worker/worker.py
new file mode 100644
index 00000000..5c874c6f
--- /dev/null
+++ b/worker/worker.py
@@ -0,0 +1,415 @@
+import asyncio
+import logging
+import time
+from asyncio import Queue
+from functools import partial
+from time import process_time
+from typing import AsyncGenerator, Optional
+
+from shared.db.sqlite import AsyncSQLiteEventStorage
+from shared.types.common import NodeId
+from shared.types.events import (
+    ChunkGenerated,
+    Event,
+    InstanceDeleted,
+    RunnerDeleted,
+    RunnerStatusUpdated,
+    TaskFailed,
+    TaskStateUpdated,
+)
+from shared.types.state import State
+from shared.types.tasks import TaskId, TaskStatus
+from shared.types.worker.common import RunnerId
+from shared.types.worker.downloads import (
+    DownloadCompleted,
+    DownloadFailed,
+    DownloadOngoing,
+    DownloadPending,
+    DownloadProgressData,
+)
+from shared.types.worker.ops import (
+    AssignRunnerOp,
+    ExecuteTaskOp,
+    RunnerDownOp,
+    RunnerFailedOp,
+    RunnerOp,
+    RunnerOpType,
+    RunnerUpOp,
+    UnassignRunnerOp,
+)
+from shared.types.worker.runners import (
+    DownloadingRunnerStatus,
+    FailedRunnerStatus,
+    InactiveRunnerStatus,
+    LoadedRunnerStatus,
+    RunningRunnerStatus,
+)
+from shared.types.worker.shards import ShardMetadata
+from worker.common import AssignedRunner
+from worker.download.shard_downloader import RepoDownloadProgress, ShardDownloader
+from worker.runner.runner_supervisor import RunnerSupervisor
+
+
+class Worker:
+    def __init__(
+        self,
+        node_id: NodeId,
+        logger: logging.Logger,
+        shard_downloader: ShardDownloader,
+        worker_events: AsyncSQLiteEventStorage | None,
+        global_events: AsyncSQLiteEventStorage | None,
+    ):
+        self.node_id: NodeId = node_id
+        self.state: State = State()
+        self.shard_downloader: ShardDownloader = shard_downloader
+        self.worker_events: AsyncSQLiteEventStorage | None = worker_events # worker_events is None in some tests.
+        self.global_events: AsyncSQLiteEventStorage | None = global_events
+        self.logger: logging.Logger = logger
+
+        self.assigned_runners: dict[RunnerId, AssignedRunner] = {}
+        self._task: asyncio.Task[None] | None = None
+
+    ## Op Executors
+
+    async def _execute_assign_op(
+        self, op: AssignRunnerOp
+    ) -> AsyncGenerator[Event, None]:
+        '''
+        A runner has been assigned. We need to also ensure that it's downloaded.
+        This op assigns the runner, and moves from Downloading -> Inactive (ready to spin) state.
+        '''
+        self.assigned_runners[op.runner_id] = AssignedRunner(
+            runner_id=op.runner_id,
+            instance_id=op.instance_id,
+            shard_metadata=op.shard_metadata,
+            hosts=op.hosts,
+            status=DownloadingRunnerStatus(
+                download_progress=DownloadPending(
+                    node_id=self.node_id
+                )
+            ),
+            runner=None,
+        )
+
+        assigned_runner = self.assigned_runners[op.runner_id]
+        initial_progress = await self.shard_downloader.get_shard_download_status_for_shard(op.shard_metadata)
+
+        if initial_progress.status == "complete":
+            assigned_runner.status = DownloadingRunnerStatus(
+                download_progress=DownloadCompleted(
+                    node_id=self.node_id
+                )
+            )
+            yield assigned_runner.status_update_event()
+
+            assigned_runner.status = InactiveRunnerStatus()
+            yield assigned_runner.status_update_event()
+
+            return
+        else:
+            assigned_runner.status = DownloadingRunnerStatus(
+                download_progress=DownloadOngoing(
+                    node_id=self.node_id,
+                    download_progress=DownloadProgressData(
+                        total_bytes=initial_progress.total_bytes,
+                        downloaded_bytes=initial_progress.downloaded_bytes
+                    )
+                )
+            )
+            yield assigned_runner.status_update_event()
+
+            # Download it!
+            # TODO: we probably want download progress as part of a callback that gets passed to the downloader.
+            download_progress_queue: asyncio.Queue[RepoDownloadProgress] = asyncio.Queue()
+            def download_progress_callback(shard: ShardMetadata, progress: RepoDownloadProgress) -> None:
+                download_progress_queue.put_nowait(progress)
+
+
+            self.shard_downloader.on_progress(download_progress_callback)
+
+            asyncio.create_task(self.shard_downloader.ensure_shard(op.shard_metadata))
+
+            # TODO: Dynamic timeout, timeout on no packet update received.
+            timeout_secs = 10 * 60
+            start_time = process_time()
+            last_yield_progress = start_time
+            while process_time() - start_time < timeout_secs:
+                progress: RepoDownloadProgress = await download_progress_queue.get()
+                if progress.status == "complete":
+                    assigned_runner.status = DownloadingRunnerStatus(
+                        download_progress=DownloadCompleted(
+                            node_id=self.node_id,
+                        )
+                    )
+                    yield assigned_runner.status_update_event()
+
+                    assigned_runner.status = InactiveRunnerStatus()
+                    yield assigned_runner.status_update_event()
+
+                    break
+                elif progress.status == "in_progress":
+                    if process_time() - last_yield_progress > 1:
+                        assigned_runner.status = DownloadingRunnerStatus(
+                            download_progress=DownloadOngoing(
+                                node_id=self.node_id,
+                                download_progress=DownloadProgressData(
+                                    total_bytes=progress.total_bytes,
+                                    downloaded_bytes=progress.downloaded_bytes,
+                                )
+                            )
+                        )
+                        yield assigned_runner.status_update_event()
+
+                        last_yield_progress = process_time()
+            else:
+                assigned_runner.status = DownloadingRunnerStatus(
+                    download_progress=DownloadFailed(
+                        node_id=self.node_id,
+                        error_message=f"Timeout downloading model: {op.shard_metadata.model_meta.model_id}"
+                    )
+                )
+                yield assigned_runner.status_update_event()
+
+    async def _execute_unassign_op(
+        self, op: UnassignRunnerOp
+    ) -> AsyncGenerator[Event, None]:
+        if op.runner_id not in self.assigned_runners:
+            return
+
+        # We can try to do a graceful shutdown of the runner.
+        runner: RunnerSupervisor | None = self.assigned_runners[op.runner_id].runner
+        if runner is not None:
+            await runner.astop()
+
+        # This is all we really need:
+        del self.assigned_runners[op.runner_id]
+        yield RunnerDeleted(runner_id=op.runner_id)
+
+        return
+        yield
+
+    async def _execute_runner_up_op(
+        self, op: RunnerUpOp, initialize_timeout: Optional[float] = None
+    ) -> AsyncGenerator[Event, None]:
+        assigned_runner = self.assigned_runners[op.runner_id]
+
+        # TODO: This should be dynamic, based on the size of the model.
+        if not initialize_timeout:
+            gigabytes_per_second = 10
+            kilobytes_per_second = gigabytes_per_second * 1024 * 1024
+            
+            shard = assigned_runner.shard_metadata
+            weights_size_kb = (shard.end_layer - shard.start_layer) / shard.n_layers * shard.model_meta.storage_size_kilobytes
+            
+            initialize_timeout = weights_size_kb / kilobytes_per_second + 120.0 # Add a constant 120.0 to ensure connection can be made as well
+
+            self.logger.info(f"initialize_timeout: {initialize_timeout}")
+
+        try:
+            assigned_runner.runner = await asyncio.wait_for(
+                RunnerSupervisor.create(
+                    model_shard_meta=assigned_runner.shard_metadata,
+                    hosts=assigned_runner.hosts,
+                    logger=self.logger,
+                ),
+                timeout=initialize_timeout,
+            )
+        except TimeoutError as e:
+            import traceback
+
+            tb = traceback.format_exc()
+            e = Exception(f"{type(e).__name__}: {str(e)}. Traceback: {tb}")
+            async for event in self._fail_runner(e=e, runner_id=op.runner_id):
+                yield event
+            return
+
+        if assigned_runner.runner.healthy:
+            assigned_runner.status = LoadedRunnerStatus()
+        else:
+            assigned_runner.status = FailedRunnerStatus()
+        yield self.assigned_runners[op.runner_id].status_update_event()
+
+    async def _execute_runner_down_op(
+        self, op: RunnerDownOp
+    ) -> AsyncGenerator[Event, None]:
+        assigned_runner = self.assigned_runners[op.runner_id]
+
+        if isinstance(assigned_runner.runner, RunnerSupervisor):
+            await assigned_runner.runner.astop()
+
+        assigned_runner.runner = None
+
+        assigned_runner.status = InactiveRunnerStatus()
+        yield assigned_runner.status_update_event()
+        return
+
+    async def _execute_runner_failed_op(
+        self, op: RunnerFailedOp
+    ) -> AsyncGenerator[Event, None]:
+        '''
+        We detected that this runner has failed. So we'll put it into 'failed' state now, triggering the rest of the instance to spin down.
+        '''
+        assigned_runner = self.assigned_runners[op.runner_id]
+
+        assigned_runner.status = FailedRunnerStatus()
+        yield self.assigned_runners[op.runner_id].status_update_event()
+
+
+    async def _execute_task_op(
+        self, op: ExecuteTaskOp
+    ) -> AsyncGenerator[Event, None]:
+        '''
+        This is the entry point for a chat completion starting.
+        While there is only one execute function, it will get called in different ways for runner 0 and runner [1, 2, 3, ...].
+        Runners [1, 2, 3, ...] will run this method when a task is in 'pending' state.
+        Runner 0 will run this method when a task is in 'running' state.
+        TODO: How do we handle the logic of ensuring that n-1 nodes have started their execution before allowing the 0'th runner to start?
+        This is still a little unclear to me.
+        '''
+        assigned_runner = self.assigned_runners[op.runner_id]
+
+        async def inner_execute(queue: asyncio.Queue[Event]) -> None:
+            async def running_callback(queue: asyncio.Queue[Event]) -> None:
+                # Called when the MLX process has been kicked off
+                assigned_runner.status = RunningRunnerStatus()
+                await queue.put(assigned_runner.status_update_event())
+
+                if assigned_runner.shard_metadata.device_rank == 0:
+                    await queue.put(TaskStateUpdated(
+                        task_id=op.task.task_id,
+                        task_status=TaskStatus.RUNNING,
+                    ))
+
+            try:
+                assert assigned_runner.runner is not None
+                assert assigned_runner.runner.healthy
+
+                async for chunk in assigned_runner.runner.stream_response(
+                        task=op.task,
+                        request_started_callback=partial(running_callback, queue)):
+                    if assigned_runner.shard_metadata.device_rank == 0:
+                        await queue.put(ChunkGenerated(
+                            # todo: at some point we will no longer have a bijection between task_id and row_id. 
+                            # So we probably want to store a mapping between these two in our Worker object.
+                            command_id=chunk.command_id, 
+                            chunk=chunk
+                        ))
+
+                if assigned_runner.shard_metadata.device_rank == 0:
+                    await queue.put(TaskStateUpdated(
+                        task_id=op.task.task_id,
+                        task_status=TaskStatus.COMPLETE,
+                    ))
+
+                # After a successful inference:
+                assigned_runner.status = LoadedRunnerStatus()
+                await queue.put(assigned_runner.status_update_event())
+
+
+            except Exception as e:
+                # An exception occurs in the runner supervisor
+                self.logger.warning(f'Runner failed whilst running inference task. Task: {op.task}. Error: {e}')
+                async for event in self._fail_task(e, op.runner_id, op.task.task_id):
+                    await queue.put(event)
+
+        queue: Queue[Event] = asyncio.Queue()
+        task = asyncio.create_task(inner_execute(queue))
+
+        # TODO: Initial (prefil) timeout can be dynamic
+        # model_kb = assigned_runner.shard_metadata.model_meta.storage_size_kilobytes
+
+        try:
+            # Yield items from the queue
+            # timeout = 30.
+            timeout = 3.
+            while True:
+                item: Event = await asyncio.wait_for(queue.get(), timeout=timeout)
+                yield item
+                timeout = 2.
+                if isinstance(item, RunnerStatusUpdated) and isinstance(
+                    item.runner_status, (LoadedRunnerStatus, FailedRunnerStatus)
+                ):
+                    if isinstance(item.runner_status, LoadedRunnerStatus):
+                        assigned_runner.failures = []
+                        
+                    break
+        except TimeoutError as e:
+            # Runner supervisor doesn't respond in time; so we put the runner & task into a failed state
+            self.logger.warning(f'Timed out waiting for runner response to inference task. Task: {op.task}.')
+            async for event in self._fail_task(e, op.runner_id, op.task.task_id):
+                yield event
+        finally:
+            # Ensure the task is cleaned up
+            try:
+                await asyncio.wait_for(task, timeout=5)
+            except asyncio.TimeoutError:
+                self.logger.warning("Timed out waiting for task cleanup after inference execution.")
+        
+
+    ## Operation Planner
+
+    async def execute_op(self, op: RunnerOp) -> AsyncGenerator[Event, None]:
+        ## It would be great if we can get rid of this async for ... yield pattern.
+        match op.op_type:
+            case RunnerOpType.ASSIGN_RUNNER:
+                event_generator = self._execute_assign_op(op)
+            case RunnerOpType.UNASSIGN_RUNNER:
+                event_generator = self._execute_unassign_op(op)
+            case RunnerOpType.RUNNER_UP:
+                event_generator = self._execute_runner_up_op(op)
+            case RunnerOpType.RUNNER_DOWN:
+                event_generator = self._execute_runner_down_op(op)
+            case RunnerOpType.RUNNER_FAILED:
+                event_generator = self._execute_runner_failed_op(op)
+            case RunnerOpType.CHAT_COMPLETION:
+                event_generator = self._execute_task_op(op)
+
+        async for event in event_generator:
+            yield event
+
+
+    async def _fail_runner(self, e: Exception, runner_id: RunnerId) -> AsyncGenerator[Event]:
+        if runner_id in self.assigned_runners:
+            assigned_runner = self.assigned_runners[runner_id]
+
+            assigned_runner.runner = None
+            assigned_runner.status = FailedRunnerStatus(error_message=str(e))
+            assigned_runner.failures.append(
+                (
+                    time.time(),
+                    e
+                )
+            )
+
+            # Reset failure count back to 0 when succesful
+            if len(assigned_runner.failures) >= 3:
+                # Too many retries. We will emit a DeleteInstance 
+                yield InstanceDeleted(
+                    instance_id=assigned_runner.instance_id
+                )
+
+            yield assigned_runner.status_update_event()
+
+    
+    async def _fail_task(self, e: Exception, runner_id: RunnerId, task_id: TaskId) -> AsyncGenerator[Event]:
+        if runner_id in self.assigned_runners:
+            yield TaskStateUpdated(
+                task_id=task_id,
+                task_status=TaskStatus.FAILED,
+            )
+
+            yield TaskFailed(
+                task_id=task_id,
+                error_type=str(type(e)),
+                error_message=str(e)
+            )
+
+            async for event in self._fail_runner(e, runner_id):
+                yield event
+
+
+    async def event_publisher(self, event: Event) -> None:
+        assert self.worker_events is not None
+        await self.worker_events.append_events([event], self.node_id)
+        self.logger.info(f"published event: {event}")
+

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