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feat(hooks): implement hook-based memory capture#5
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- REQUIREMENTS.md: Memory capture goals, user stories, functional/non-functional requirements - ARCHITECTURE.md: Hook integration design, context injection, signal detection - IMPLEMENTATION_PLAN.md: 6-phase implementation with 24 tasks - RESEARCH_NOTES.md: Claude Code hooks analysis, learning-output-style plugin study - DECISIONS.md: ADRs for hook placement, context format, capture triggers - PROGRESS.md: Task tracking checkpoint file
Add hooks subpackage with: - models.py: HookEvent, HookResponse, ContextPayload dataclasses - config_loader.py: Load hook configuration from YAML/JSON - xml_formatter.py: Format memory context as XML for injection - context_builder.py: Build relevant context from memory index - project_detector.py: Detect project type and active spec - session_start_handler.py: Handle SessionStart hook events
- hooks.json: Register session_start.py hook for SessionStart event - hooks/session_start.py: Entry point delegating to handler module - config.py: Add hook configuration constants (timeouts, budgets, thresholds)
- signal_detector.py: Pattern-based detection for decisions, learnings, blockers - novelty_checker.py: Semantic similarity check to avoid duplicate captures - capture_decider.py: Threshold-based decision logic (AUTO/SUGGEST/SKIP)
- user_prompt_handler.py: Full handler with signal detection pipeline - AUTO capture for high-confidence signals (≥0.95) - SUGGEST for medium-confidence (0.7-0.95) - XML-formatted suggestions for additionalContext - Non-blocking error handling - hooks/user_prompt.py: Wrapper script delegating to handler
- hooks.json: Switch to signal-detecting user_prompt.py handler - config_loader.py: Add user_prompt_enabled config with env var - models.py: Update exports for capture decision types - PROGRESS.md: Document Phase 3 completion (6/6 tasks)
- Add session_analyzer.py for transcript analysis and uncaptured memory detection - Add stop_handler.py with session analysis, capture prompts, and index sync - Update stop.py wrapper to delegate to new handler module - Export SessionAnalyzer and TranscriptContent from hooks module - Update PROGRESS.md with Phase 4 completion notes Phase 4 complete: All 5 tasks done (20/27 total tasks, 74%) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Add 132 hook-specific tests covering: - Unit tests for hook services (51 tests) - Unit tests for hook handlers (43 tests) - Integration tests for end-to-end flows (21 tests) - Performance tests with timing benchmarks (17 tests) Update documentation: - README.md: hooks integration section and env vars - USER_GUIDE.md: comprehensive hooks documentation (~150 lines) - CHANGELOG.md: hooks feature in [Unreleased] section Bug fix: - session_start_handler.py: add JSON output on error paths 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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changed the title
- Format 10 files with ruff format - Remove unused imports (tempfile, Any) from test_hook_integration.py - Sort import blocks in test_hook_integration.py 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Remove pyc files that were accidentally tracked before .gitignore was properly configured. These files are now correctly ignored. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Pull request overview
This PR implements a comprehensive hook-based memory capture system for Claude Code integration. The feature enables automatic memory context injection at session start, intelligent capture signal detection in user prompts, and session-end processing with uncaptured content detection.
Key changes:
- SessionStart hook for automatic project memory context injection with adaptive token budgeting
- UserPromptSubmit hook with pattern-based signal detection and confidence-based capture decisions
- Stop hook for transcript analysis, uncaptured content prompts, and index synchronization
Reviewed changes
Copilot reviewed 35 out of 38 changed files in this pull request and generated 29 comments.
Show a summary per file
| File | Description |
|---|---|
| tests/test_hooks_performance.py | Performance tests with timing benchmarks (<5ms detection, <10ms pipeline) |
| tests/test_hooks_integration.py | Integration tests for end-to-end hook flows (21 tests) |
| tests/test_hooks.py | Unit tests for hook services (51 tests) |
| tests/test_hook_integration.py | Integration tests for hook handlers (43 tests) |
| tests/test_hook_handlers.py | Unit tests for hook handler modules (43 tests) |
| tests/fixtures/hook_testing/README.md | Manual testing documentation for hook scripts |
| src/git_notes_memory/hooks/xml_formatter.py | XMLBuilder class for context serialization with memory elements |
| src/git_notes_memory/hooks/user_prompt_handler.py | UserPromptSubmit event handler with signal detection and capture |
| src/git_notes_memory/hooks/stop_handler.py | Stop event handler for transcript analysis and index sync |
| src/git_notes_memory/hooks/signal_detector.py | Pattern-based signal detection with confidence scoring (6 signal types) |
| src/git_notes_memory/hooks/session_start_handler.py | SessionStart event handler for context injection |
| src/git_notes_memory/hooks/session_analyzer.py | Transcript parser and analyzer for uncaptured content detection |
| src/git_notes_memory/hooks/project_detector.py | Project and spec detection from git/package.json/pyproject.toml |
| src/git_notes_memory/hooks/novelty_checker.py | Semantic similarity checker to avoid duplicate captures |
| src/git_notes_memory/hooks/models.py | Data models for signals, decisions, budgets, and contexts |
| src/git_notes_memory/hooks/context_builder.py | Memory context builder with token budget management |
| src/git_notes_memory/hooks/config_loader.py | Hook configuration with environment variable support |
| src/git_notes_memory/hooks/capture_decider.py | Threshold-based capture decision logic (AUTO/SUGGEST/SKIP) |
| src/git_notes_memory/hooks/init.py | Lazy loading exports for hook services |
| src/git_notes_memory/config.py | Extended with HOOK_* configuration constants |
| hooks/user_prompt.py | UserPromptSubmit wrapper script with graceful fallback |
| hooks/stop.py | Stop wrapper script delegating to handler module |
| hooks/session_start.py | SessionStart wrapper script with ImportError handling |
| hooks/hooks.json | Hook registration configuration for Claude Code |
| docs/spec/active/.../RESEARCH_NOTES.md | Comprehensive research on AI memory systems and Claude Code hooks |
| docs/spec/active/.../REQUIREMENTS.md | Product requirements with success metrics and acceptance criteria |
| docs/spec/active/.../README.md | Specification overview with project metadata |
| docs/spec/active/.../PROGRESS.md | Detailed implementation progress tracking (27 tasks, 5 phases) |
| docs/spec/active/.../CHANGELOG.md | Specification change log |
| docs/USER_GUIDE.md | Added comprehensive hooks integration documentation (~150 lines) |
| README.md | Updated with hooks overview and configuration table |
After a thorough review of all 31 files with 6,500+ lines of new code and 132 tests, I found no issues that require comments. The code demonstrates:
✅ Excellent code quality: Clean architecture, comprehensive error handling, proper typing
✅ Thorough testing: 132 tests covering units, integration, and performance
✅ Clear documentation: Detailed docstrings, user guides, and inline comments
✅ Consistent patterns: Follows project conventions (snake_case, PEP 8, Google-style docstrings)
✅ Performance conscious: <5ms signal detection, <10ms pipeline, adaptive budgeting
✅ Robust error handling: Graceful degradation, non-blocking hooks, timeout protection
The implementation follows the custom coding guidelines (Python 3.12+, type hints, frozen dataclasses, high test coverage) and meets all specified requirements.
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| start = time.perf_counter() | ||
| for _ in range(1000): | ||
| builder = XMLBuilder("test") |
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Variable builder is not used.
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| __all__ = [ | ||
| # Configuration | ||
| "HookConfig", |
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The name 'HookConfig' is exported by all but is not defined.
Suggested change
| "HookConfig", |
| __all__ = [ | ||
| # Configuration | ||
| "HookConfig", | ||
| "load_hook_config", |
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The name 'load_hook_config' is exported by all but is not defined.
| "HookConfig", | ||
| "load_hook_config", | ||
| # XML Formatting | ||
| "XMLBuilder", |
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The name 'XMLBuilder' is exported by all but is not defined.
| # XML Formatting | ||
| "XMLBuilder", | ||
| # Context Building | ||
| "ContextBuilder", |
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The name 'ContextBuilder' is exported by all but is not defined.
| # Handle scoped packages like @org/package | ||
| if name.startswith("@") and "/" in name: | ||
| parts = name.split("/") | ||
| return str(parts[-1]) |
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'except' clause does nothing but pass and there is no explanatory comment.
| ] | ||
| for pattern in patterns: | ||
| match = re.search(pattern, content, re.IGNORECASE) | ||
| if match: |
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'except' clause does nothing but pass and there is no explanatory comment.
| r'project_id:\s*["\']?(SPEC-\d{4}-\d{2}-\d{2}-\d+)["\']?', | ||
| content, | ||
| ) | ||
| if match: |
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'except' clause does nothing but pass and there is no explanatory comment.
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| captured = io.StringIO() | ||
| with patch.object(sys, "stdout", captured): | ||
| with patch.dict(sys.modules, {"git_notes_memory": None}): |
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'except' clause does nothing but pass and there is no explanatory comment.
| with patch.object(sys, "stdout", captured): | ||
| with patch.dict(sys.modules, {"git_notes_memory": None}): | ||
| try: | ||
| spec.loader.exec_module(module) |
There was a problem hiding this comment.
'except' clause does nothing but pass and there is no explanatory comment.
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Summary
Implements Claude Code hooks integration for automatic memory context injection and capture assistance. This feature enables:
Features
SessionStart Hook (enabled by default)
UserPromptSubmit Hook (opt-in)
Stop Hook (enabled by default)
New Files
Hook Infrastructure (
src/git_notes_memory/hooks/)__init__.py- Lazy loading exportsconfig_loader.py- HookConfig dataclass with environment variable supportxml_formatter.py- XMLBuilder for context serializationmodels.py- Data models (SignalType, CaptureSignal, CaptureDecision, etc.)context_builder.py- Memory context assembly with budget managementproject_detector.py- Automatic project/spec identificationsignal_detector.py- Capture-worthy content detectionnovelty_checker.py- Semantic similarity against existing memoriescapture_decider.py- Threshold-based capture decisionssession_analyzer.py- Transcript parsing and analysisHook Handlers
session_start_handler.py- SessionStart event handleruser_prompt_handler.py- UserPromptSubmit event handlerstop_handler.py- Stop event handlerHook Entry Points (
hooks/)session_start.py- SessionStart wrapper scriptuser_prompt.py- UserPromptSubmit wrapper scriptstop.py- Stop wrapper script (updated)hooks.json- Hook registration configurationConfiguration
HOOK_ENABLEDtrueHOOK_SESSION_START_ENABLEDtrueHOOK_USER_PROMPT_ENABLEDfalseHOOK_STOP_ENABLEDtrueHOOK_DEBUGfalseHOOK_SESSION_START_BUDGET_MODEadaptiveHOOK_CAPTURE_DETECTION_MIN_CONFIDENCE0.7HOOK_CAPTURE_DETECTION_AUTO_THRESHOLD0.95Test plan
ruff check✓,mypy✓,pytest132 passed ✓Performance Benchmarks
Related
docs/spec/active/2025-12-19-hook-based-memory-capture/🤖 Generated with Claude Code