# Task 5 Completion Summary

**Task**: Phase 2.1, Task 5 - Event System (Node.js EventEmitter Integration)
**Status**: COMPLETE ✅
**Date**: 2026-02-06

## Implementation Summary

Implemented event-specific handlers following the EventEmitter pattern:
- `agent.on_connected(callback)` - Peer connected events
- `agent.on_disconnected(callback)` - Peer disconnected events  
- `agent.on_error(callback)` - Connection error events

### Key Features Delivered

1. **Event-Specific Methods**: Each event type has dedicated registration method with typed payloads
2. **ThreadsafeFunction**: Safe Rust→Node.js callback forwarding with CalleeHandled error strategy
3. **Background Task Management**: Spawned Tokio tasks using napi::tokio::spawn
4. **Proper Cleanup**: Agent Drop trait stops all listeners, EventListener Drop cancels background tasks
5. **Error Resilience**: Broadcast lag errors don't stop forwarding (continue vs break)

### Files Modified

- `bindings/nodejs/src/events.rs` (219 lines, new file)
- `bindings/nodejs/src/agent.rs` (event handler methods + Drop trait)
- `bindings/nodejs/src/lib.rs` (exports)

## Review Cycle

### Iteration 1: Initial Implementation
- ❌ Codex Review: Grade D (5 critical issues)

### Iteration 2: Fixes Applied
- ✅ All 5 critical issues resolved
- ✅ EventEmitter pattern matches spec
- ✅ Broadcast error handling fixed
- ✅ CalleeHandled strategy prevents panics
- ✅ Agent Drop implements cleanup
- ✅ napi::tokio::spawn for safety

### Iteration 3: Validation
- ✅ `cargo fmt --check` - PASS
- ✅ `cargo clippy -- -D warnings` - PASS
- ✅ `cargo test` - PASS (37 tests, 0 failures)
- ✅ Zero compilation warnings
- ✅ Zero test failures

### External Reviews
- **Codex (OpenAI GPT-5.2)**: Grade D → A (after fixes)
- **MiniMax**: UNAVAILABLE (API timeout, manual review conducted)

## Next Steps

**Task 6**: TaskList Creation and Join Bindings
- Expose `agent.createTaskList(name, topic)`
- Expose `agent.joinTaskList(topic)`
- Return TaskList wrapper around Rust TaskListHandle

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**Ready to proceed to Task 6** ✅

*GSD Autonomous Workflow - Task 5 Complete*
