Phase 1-6.1

TODO-DEVELOPER-A.md

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+# 🔵 Developer A: Core Execution Engine (Backend Focus)
+
+## Your Mission
+
+Implement the core hook execution engine, integrate with Codex's event system, and build comprehensive testing infrastructure.
+
+## 🎯 Your Responsibilities
+
+- Hook execution coordination and management
+- Event system integration with existing Codex architecture
+- Core testing infrastructure and validation
+- Performance optimization and error handling
+
+## 📁 Your Primary Files
+
+- `codex-rs/core/src/hooks/manager.rs` ⭐ **Your main file**
+- `codex-rs/core/src/hooks/executor.rs` ⭐ **Your main file**
+- `codex-rs/core/src/hooks/executors/` (new directory) ⭐ **Create this**
+- `codex-rs/core/src/protocol.rs`
+- `codex-rs/core/src/codex.rs`
+- `codex-rs/core/src/agent.rs`
+- `codex-rs/exec/src/event_processor.rs`
+
+## 🚀 Start Here: Phase 2.1 - Core Hook Manager
+
+### 🔴 HIGH PRIORITY: Complete Hook Manager Implementation
+
+**File**: `codex-rs/core/src/hooks/manager.rs`
+
+#### Current Status
+
+The file exists with basic structure but needs complete implementation.
+
+#### Your Tasks
+
+- [ ] **Hook Execution Coordination**
+
+  - Implement the `trigger_event` method to actually execute hooks
+  - Add hook filtering based on event type and conditions
+  - Coordinate execution of multiple hooks for the same event
+
+- [ ] **Event Subscription and Routing**
+
+  - Create event subscription mechanism
+  - Route events to appropriate hooks based on registry
+  - Handle event filtering and matching
+
+- [ ] **Error Handling and Logging**
+
+  - Implement comprehensive error handling for hook failures
+  - Add structured logging for hook execution
+  - Handle partial failures gracefully
+
+- [ ] **Performance Monitoring**
+  - Add execution time tracking
+  - Implement hook execution metrics
+  - Monitor resource usage
+
+#### Implementation Guide
+
+```rust
+// In manager.rs - implement this method
+impl HookManager {
+    pub async fn trigger_event(&self, event: LifecycleEvent) -> Result<(), HookError> {
+        if !self.config.hooks.enabled {
+            return Ok(());
+        }
+
+        // 1. Get matching hooks from registry
+        let context = HookContext::new(event.clone(), /* working_dir */);
+        let hooks = self.registry.get_matching_hooks(&event, &context)?;
+
+        // 2. Execute hooks based on priority and mode
+        // 3. Handle errors and collect results
+        // 4. Log execution metrics
+
+        // TODO: Your implementation here
+    }
+}
+```
+
+---
+
+## 📋 Your Complete Task List
+
+### 🔄 Phase 2: Hook Execution Engine
+
+#### 2.1 Core Hook Manager ⭐ **COMPLETED** ✅
+
+- [x] Complete hook execution coordination in `manager.rs`
+- [x] Implement event subscription and routing
+- [x] Add error handling and logging
+- [x] Performance monitoring and metrics
+
+#### 2.2 Hook Executor Framework ✅ **COMPLETED**
+
+- [x] Complete timeout management and cancellation in `executor.rs`
+- [x] Implement error isolation and recovery
+- [x] Add execution mode support (blocking/non-blocking, parallel/sequential)
+- [x] Hook execution result aggregation
+
+#### 2.3 Hook Executor Implementations ✅ **COMPLETED**
+
+- [x] Create `codex-rs/core/src/hooks/executors/mod.rs`
+- [x] Implement `ScriptExecutor` in `executors/script.rs`
+- [x] Implement `WebhookExecutor` in `executors/webhook.rs`
+- [x] Implement `McpToolExecutor` in `executors/mcp.rs`
+
+### 🔄 Phase 3: Event System Integration
+
+#### 3.1 Protocol Extensions ✅ **COMPLETED**
+
+- [x] Add lifecycle event types to `protocol.rs`
+- [x] Add hook execution events for monitoring
+- [x] Update event serialization/deserialization
+
+#### 3.2 Core Integration Points ✅ **COMPLETED**
+
+- [x] Integrate hook manager in `codex.rs`
+- [x] Add hook trigger points in `agent.rs`
+- [x] Session and task lifecycle hooks
+
+#### 3.3 Execution Integration ✅ **COMPLETED**
+
+- [x] Add hook execution to `event_processor.rs`
+- [x] Command execution hooks (before/after)
+- [x] Patch application hooks (before/after)
+- [x] MCP tool execution hooks
+
+### 🔄 Phase 6: Testing and Validation
+
+#### 6.1 Unit Tests
+
+- [ ] Test hook execution coordination
+- [ ] Test timeout and error handling
+- [ ] Test individual hook executors
+
+#### 6.2 Integration Tests
+
+- [ ] Test hook execution with real events
+- [ ] Test hook error handling and recovery
+- [ ] Test performance impact
+
+#### 6.3 End-to-End Tests
+
+- [ ] Test complete hook workflows
+- [ ] Test integration with existing Codex functionality
+
+---
+
+## 🎯 Success Criteria
+
+By the end of your work, you should achieve:
+
+- [ ] **Hooks execute successfully** with proper error handling
+- [ ] **Performance impact < 5%** on normal Codex operations
+- [ ] **All hook types working** (script, webhook, MCP)
+- [ ] **Integration tests passing** with good coverage
+
+---
+
+## 🤝 Coordination with Developer B
+
+### What Developer B is Working On
+
+- Client-side integration (CLI, TypeScript)
+- Documentation and examples
+- Advanced features and monitoring
+
+### Shared Dependencies (Already Complete ✅)
+
+- Hook Types (`types.rs`)
+- Hook Context (`context.rs`)
+- Hook Configuration (`config.rs`)
+- Hook Registry (`registry.rs`)
+
+### Communication
+
+- **Daily sync**: Share progress and blockers
+- **Branch naming**: Use `feat/hook-execution-*` pattern
+- **File ownership**: You own backend Rust files
+- **Testing**: Run full test suite before merging
+
+---
+
+## 🚀 Getting Started Commands
+
+```bash
+# Create your feature branch
+git checkout -b feat/hook-execution-engine
+
+# Start with the manager implementation
+code codex-rs/core/src/hooks/manager.rs
+
+# Test your changes
+cd codex-rs && cargo test hooks
+
+# Commit your progress
+git add .
+git commit -m "feat: implement hook execution coordination"
+git push origin feat/hook-execution-engine
+```
+
+---
+
+## 📊 Your Progress Tracking
+
+### Phase 2: Hook Execution Engine
+
+- [x] **2.1 Complete**: Core Hook Manager (4/4 tasks) ✅
+- [x] **2.2 Complete**: Hook Executor Framework (4/4 tasks) ✅
+- [x] **2.3 Complete**: Hook Executor Implementations (4/4 tasks) ✅
+
+### Phase 3: Event System Integration
+
+- [x] **3.1 Complete**: Protocol Extensions (3/3 tasks) ✅
+- [x] **3.2 Complete**: Core Integration Points (3/3 tasks) ✅
+- [x] **3.3 Complete**: Execution Integration (4/4 tasks) ✅
+
+### Phase 6: Testing and Validation
+
+- [ ] **6.1 Complete**: Unit Tests (0/3 tasks)
+- [ ] **6.2 Complete**: Integration Tests (0/3 tasks)
+- [ ] **6.3 Complete**: End-to-End Tests (0/2 tasks)
+
+**Your Total Progress: 22/30 tasks complete (73%)**
+
+---
+
+## 💡 Tips for Success
+
+1. **Start Small**: Begin with basic hook execution in `manager.rs`
+2. **Test Early**: Write tests as you implement features
+3. **Use Existing Patterns**: Follow Codex's existing async patterns
+4. **Performance First**: Keep the async, non-blocking design
+5. **Error Handling**: Hooks should never crash the main process
+6. **Logging**: Add comprehensive tracing for debugging
+
+**You've got this! 🚀**