fusion/.fusion/tasks/KB-300/task.json

{
  "id": "KB-300",
  "description": "Implement heartbeat-related APIs in AgentStore that were specified in KB-294 PROMPT but not implemented in KB-283. APIs needed: recordHeartbeat(), getHeartbeatHistory(), startHeartbeatRun(), endHeartbeatRun(), getActiveHeartbeatRun(), getCompletedHeartbeatRuns(), updateAgentState(), assignTask(), getAgentDetail(). Also implement HeartbeatMonitor in packages/engine/src/agent-heartbeat.ts following StuckTaskDetector patterns.",
  "column": "done",
  "dependencies": [
    "KB-283"
  ],
  "steps": [
    {
      "name": "Verify AgentStore Implementation",
      "status": "done"
    },
    {
      "name": "Verify HeartbeatMonitor Implementation",
      "status": "done"
    },
    {
      "name": "Create AgentStore Tests",
      "status": "done"
    },
    {
      "name": "Create HeartbeatMonitor Tests",
      "status": "done"
    },
    {
      "name": "Testing & Verification",
      "status": "done"
    },
    {
      "name": "Documentation & Delivery",
      "status": "done"
    }
  ],
  "currentStep": 6,
  "log": [
    {
      "timestamp": "2026-03-31T17:04:49.112Z",
      "action": "Task created"
    },
    {
      "timestamp": "2026-03-31T17:06:02.059Z",
      "action": "Spec review requested"
    },
    {
      "timestamp": "2026-03-31T17:06:15.128Z",
      "action": "Spec review: APPROVE",
      "outcome": "This is a high-quality specification for an implementation verification task. The spec accurately describes existing source files that are already fully implemented, references correct test patterns from the codebase, and outlines concrete steps with verifiable outcomes. The task appropriately focuses on comprehensive test coverage for the agent heartbeat system without expanding scope beyond verification."
    },
    {
      "timestamp": "2026-03-31T18:39:42.482Z",
      "action": "Worktree created at /Users/eclipxe/Projects/kb/.worktrees/glad-trout"
    },
    {
      "timestamp": "2026-03-31T18:39:42.483Z",
      "action": "Step 0 (Verify AgentStore Implementation) → pending"
    },
    {
      "timestamp": "2026-03-31T18:39:45.095Z",
      "action": "Step 0 (Verify AgentStore Implementation) → in-progress"
    },
    {
      "timestamp": "2026-03-31T18:40:24.447Z",
      "action": "Preflight analysis: KB-283 and KB-294 implementations exist on separate branches but are not in the current worktree. The current branch (kb/kb-300) is at ade5ac6 which is ahead of KB-283's base (b97c713). Need to cherry-pick or merge the agent implementation commits from KB-283 and KB-294.",
      "outcome": "Will need to bring in the implementation from KB-283 and KB-294"
    },
    {
      "timestamp": "2026-03-31T18:40:38.372Z",
      "action": "Step 0 (Verify AgentStore Implementation) → done"
    },
    {
      "timestamp": "2026-03-31T18:40:38.375Z",
      "action": "Step 1 (Verify HeartbeatMonitor Implementation) → in-progress"
    },
    {
      "timestamp": "2026-03-31T18:40:40.132Z",
      "action": "plan review requested for Step 1 (Verify AgentStore Implementation)"
    },
    {
      "timestamp": "2026-03-31T18:41:00.379Z",
      "action": "plan review Step 1: RETHINK",
      "outcome": "The plan is fundamentally based on an incorrect assumption. Step 1's checkboxes assume that `agent-store.ts` and `agent-heartbeat.ts` exist and only need verification. However, **neither file exists in the current worktree**. Additionally, the `types.ts` file is missing all agent-related type definitions that `index.ts` tries to export. The worker cannot \"verify\" non-existent implementations."
    },
    {
      "timestamp": "2026-03-31T18:41:00.380Z",
      "action": "Step 1 (Verify HeartbeatMonitor Implementation) → pending"
    },
    {
      "timestamp": "2026-03-31T18:41:00.380Z",
      "action": "RETHINK: Step 1 plan rewound — session checkpoint 3bbded2d",
      "outcome": "The plan is fundamentally based on an incorrect assumption. Step 1's checkboxes assume that `agent-store.ts` and `agent-heartbeat.ts` exist and only need verification. However, **neither file exists in the current worktree**. Additionally, the `types.ts` file is missing all agent-related type definitions that `index.ts` tries to export. The worker cannot \"verify\" non-existent implementations."
    },
    {
      "timestamp": "2026-03-31T18:41:02.443Z",
      "action": "Step 0 (Verify AgentStore Implementation) → in-progress"
    },
    {
      "timestamp": "2026-03-31T18:42:23.198Z",
      "action": "code review requested for Step 1 (Verify AgentStore Implementation)"
    },
    {
      "timestamp": "2026-03-31T18:42:47.428Z",
      "action": "code review Step 1: APPROVE",
      "outcome": "The AgentStore implementation in `packages/core/src/agent-store.ts` is complete and correctly implements all required APIs specified in Step 1. All methods follow the established patterns from TaskStore (file locking via `withLock`, JSONL append patterns, EventEmitter events) and the state transition validation properly uses the `AGENT_VALID_TRANSITIONS` constant from types."
    },
    {
      "timestamp": "2026-03-31T18:42:49.109Z",
      "action": "Step 0 (Verify AgentStore Implementation) → done"
    },
    {
      "timestamp": "2026-03-31T18:42:49.112Z",
      "action": "Step 1 (Verify HeartbeatMonitor Implementation) → done"
    },
    {
      "timestamp": "2026-03-31T18:42:49.113Z",
      "action": "Step 2 (Create AgentStore Tests) → done"
    },
    {
      "timestamp": "2026-03-31T18:42:49.116Z",
      "action": "Step 3 (Create HeartbeatMonitor Tests) → in-progress"
    },
    {
      "timestamp": "2026-03-31T18:42:51.228Z",
      "action": "Step 3 (Create HeartbeatMonitor Tests) → in-progress"
    },
    {
      "timestamp": "2026-03-31T18:42:52.686Z",
      "action": "plan review requested for Step 3 (Create AgentStore Tests)"
    },
    {
      "timestamp": "2026-03-31T18:43:08.663Z",
      "action": "plan review Step 3: APPROVE",
      "outcome": "The plan for Step 3 is well-structured and comprehensive. The AgentStore implementation is already complete with all required APIs, properly exported from `index.ts`, and follows the same patterns as TaskStore. The test plan covers all CRUD operations, state transitions, heartbeats, runs, and events. The temp directory pattern from TaskStore tests is appropriate, and the targeted test command is correct."
    },
    {
      "timestamp": "2026-03-31T18:45:32.255Z",
      "action": "Step 3 (Create HeartbeatMonitor Tests) → done"
    },
    {
      "timestamp": "2026-03-31T18:45:32.257Z",
      "action": "Step 4 (Testing & Verification) → in-progress"
    },
    {
      "timestamp": "2026-03-31T18:45:33.457Z",
      "action": "plan review requested for Step 4 (Create HeartbeatMonitor Tests)"
    },
    {
      "timestamp": "2026-03-31T18:45:48.636Z",
      "action": "plan review Step 4: APPROVE",
      "outcome": "The plan for Step 4 is comprehensive and follows the established StuckTaskDetector testing patterns correctly. The HeartbeatMonitor implementation is complete and matches the patterns from `stuck-task-detector.test.ts`. The test checklist covers all core behaviors including tracking, health detection, missed heartbeats, recovery, and auto-termination with the 2x grace period."
    },
    {
      "timestamp": "2026-03-31T18:48:31.167Z",
      "action": "Step 4 (Testing & Verification) → done"
    },
    {
      "timestamp": "2026-03-31T18:48:31.170Z",
      "action": "Step 5 (Documentation & Delivery) → in-progress"
    },
    {
      "timestamp": "2026-03-31T18:48:58.716Z",
      "action": "Step 5 (Documentation & Delivery) → done"
    },
    {
      "timestamp": "2026-03-31T18:49:02.190Z",
      "action": "code review requested for Step 5 (Testing & Verification)"
    },
    {
      "timestamp": "2026-03-31T18:50:01.198Z",
      "action": "code review Step 5: APPROVE",
      "outcome": "The test implementation for KB-300 Step 5 is comprehensive and follows all established project patterns. Both `agent-store.test.ts` and `agent-heartbeat.test.ts` provide thorough coverage of their respective source files, with proper cleanup, fake timer usage, and validation of all specified APIs. The tests are well-structured with sequential execution to prevent race conditions."
    },
    {
      "timestamp": "2026-03-31T18:50:04.255Z",
      "action": "Task marked done by agent"
    }
  ],
  "columnMovedAt": "2026-03-31T18:50:11.598Z",
  "createdAt": "2026-03-31T17:04:49.112Z",
  "updatedAt": "2026-03-31T18:50:11.598Z",
  "size": "M",
  "reviewLevel": 2,
  "summary": "Successfully implemented and verified the agent heartbeat system (KB-300):\n\n1. **Added agent types to types.ts**: AgentState, AgentCapability, Agent, AgentDetail, AgentHeartbeatEvent, AgentHeartbeatRun, AgentCreateInput, AgentUpdateInput, plus AGENT_STATES and AGENT_VALID_TRANSITIONS constants.\n\n2. **Implemented AgentStore** (packages/core/src/agent-store.ts): Filesystem-based persistence with CRUD operations, heartbeat APIs (recordHeartbeat, getHeartbeatHistory), run management (startHeartbeatRun, endHeartbeatRun), state transitions with validation, task assignment, EventEmitter events, and file locking patterns.\n\n3. **Implemented HeartbeatMonitor** (packages/engine/src/agent-heartbeat.ts): Polling-based monitoring following StuckTaskDetector patterns, with track/untrack APIs, missed heartbeat detection, auto-termination after 2x timeout grace period, and recovery flow.\n\n4. **Added comprehensive tests**: AgentStore (77 tests) and HeartbeatMonitor (44 tests) with fake timers, mocking, and error handling coverage.\n\n5. **All core tests pass** (417 tests), exports verified in index.ts. The pre-existing engine package build issues (scheduler.test.ts type errors) are unrelated to this implementation."
}