# Context Roadmap Summary

**Completed**: 2026-01-20
**Branch**: `038-context-roadmap-summary`
**PR**: [#576](https://github.com/seanbarlow/doit/pull/576)
**Epic**: [#548](https://github.com/seanbarlow/doit/issues/548)

## Overview

Enhanced the AI context injection system to provide intelligent roadmap summarization for AI agents. Instead of loading the full roadmap, the system now generates a prioritized summary that:

- Prioritizes P1/P2 items with full content and rationale
- Condenses P3/P4 items to titles only
- Highlights items matching the current feature branch
- Includes relevant completed roadmap items for pattern reference
- Applies AI-powered context condensation when token limits are exceeded

## Requirements Implemented

| ID | Description | Status |
|----|-------------|--------|
| FR-001 | Generate summarized view of roadmap.md prioritizing P1/P2 items | Done |
| FR-002 | Include rationale for each roadmap item when available | Done |
| FR-003 | Highlight roadmap items matching current feature branch | Done |
| FR-004 | Search completed_roadmap.md for relevant items | Done |
| FR-005 | Use keyword extraction for matching completed items | Done |
| FR-006 | Include completion date and branch reference for completed items | Done |
| FR-007 | Invoke AI summarization when context exceeds threshold | Done |
| FR-008 | Preserve source attribution in summarized output | Done |
| FR-009 | Fall back to truncation when AI summarization unavailable | Done |
| FR-010 | Support configuration options for summarization behavior | Done |
| FR-011 | Provide sensible defaults without explicit configuration | Done |
| FR-012 | Log summarization activity for debugging | Done |
| FR-013 | Respect existing token limits from ContextConfig | Done |

## Technical Details

### Architecture

The implementation follows an AI-first design philosophy, leveraging the AI coding agent (Claude, Copilot, etc.) for semantic understanding rather than implementing TF-IDF matching ourselves.

**Key Components:**

- **SummarizationConfig**: Configuration dataclass for summarization behavior
- **RoadmapSummarizer**: Parses roadmap.md and generates priority-based summaries
- **ContextCondenser**: Two-tier condensation (guidance prompt + truncation fallback)
- **Extended ContextLoader**: Integrated summarization into context loading pipeline

### Two-Tier Context Condensation

1. **Soft Threshold** (default 80%): Adds AI guidance prompt instructing the agent to prioritize P1/P2 items and current feature context
2. **Hard Limit** (100%): Truncates lowest-priority sources to fit within token limits

### Configuration

```yaml
# .doit/config/context.yaml
summarization:
  enabled: true
  threshold_percentage: 80.0
  source_priorities:
    - constitution
    - roadmap
    - completed_roadmap
    - current_spec
  fallback_to_truncation: true
```

## Files Changed

### New Files
- `src/doit_cli/services/roadmap_summarizer.py` - RoadmapSummarizer service
- `tests/unit/test_roadmap_summarizer.py` - 20 unit tests
- `specs/038-context-roadmap-summary/` - Feature specification and artifacts

### Modified Files
- `src/doit_cli/models/context_config.py` - Added SummarizationConfig, RoadmapItem, CompletedItem, RoadmapSummary dataclasses
- `src/doit_cli/services/context_loader.py` - Added ContextCondenser, completed roadmap loading
- `src/doit_cli/cli/context_command.py` - Updated to display summarization status
- `tests/unit/test_context_config.py` - Added summarization config tests
- `tests/integration/test_context_injection.py` - Added 5 integration tests

## Testing

### Automated Tests
- **Total Tests**: 99
- **Passed**: 99
- **Failed**: 0
- **Duration**: 5.07s

### Test Coverage by Component
| Component | Tests |
|-----------|-------|
| RoadmapSummarizer | 20 |
| ContextConfig | 25 |
| ContextLoader | 34 |
| Integration | 20 |

### Manual Tests
12 manual test cases defined covering:
- UI/UX verification (MT-001 to MT-003)
- Integration validation (MT-004 to MT-006)
- Configuration tests (MT-007 to MT-009)
- Edge cases (MT-010 to MT-012)

## Related Issues

### Epic
- [#548](https://github.com/seanbarlow/doit/issues/548) - Context Roadmap Summary

### Features
- [#549](https://github.com/seanbarlow/doit/issues/549) - Roadmap Priority Summary
- [#550](https://github.com/seanbarlow/doit/issues/550) - Completed Roadmap Context
- [#551](https://github.com/seanbarlow/doit/issues/551) - AI-Powered Context Summarization
- [#552](https://github.com/seanbarlow/doit/issues/552) - Summarization Configuration

### Tasks
- #553 through #575 (21 task issues)

## Success Metrics

| Metric | Target | Achieved |
|--------|--------|----------|
| Context generation time | < 3 seconds | Yes |
| Summarized content reduction | > 60% | Yes (~78% for roadmap) |
| Test coverage | 100% requirements | 13/13 (100%) |
| Breaking changes | Zero | Zero |

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*Generated by `/doit.checkin` on 2026-01-20*
