# BRIEFING — 2026-06-26T22:28:40Z

## Mission
Fix the deserialization bug in patch_explainer.py and implement test coverage >= 75% for patch_explainer.py without regressions.

## 🔒 My Identity
- Archetype: implementer, qa, specialist
- Roles: implementer, qa, specialist
- Working directory: /Users/sjkim1127/Reversecore_MCP/.agents/worker_m6_1/
- Original parent: 0c44a811-b4db-47e1-891b-60482d466a84
- Milestone: Milestone 6 (patch_explainer.py coverage)

## 🔒 Key Constraints
- Code changes must be minimal and precise.
- No dummy/facade implementations or hardcoded test results.
- Minimum coverage of 75%+ (ideally 100%) for reversecore_mcp/tools/common/patch_explainer.py.
- No regressions in other parts of the codebase.

## Current Parent
- Conversation ID: 0c44a811-b4db-47e1-891b-60482d466a84
- Updated: 2026-06-26T22:28:40Z

## Task Summary
- **What to build**: Apply deserialization bug fix in `reversecore_mcp/tools/common/patch_explainer.py` and write exhaustive tests in `tests/unit/tools/common/test_patch_explainer.py`.
- **Success criteria**: 100% (or >=75%) test coverage on `patch_explainer.py`, all unit/integration tests pass.
- **Interface contracts**: /Users/sjkim1127/Reversecore_MCP/AGENTS.md
- **Code layout**: /Users/sjkim1127/Reversecore_MCP/AGENTS.md

## Key Decisions Made
- Imported and used `json_utils` as `json` in `patch_explainer.py` for safe performance.
- Deserialized `diff_result.data` if it is an instance of string, handling cases where the mock or actual tool returns a string or a dict.
- Wrote 19 robust unit tests covering all heuristics, decompilation failures, context calls, and error handling.

## Change Tracker
- **Files modified**:
  - `reversecore_mcp/tools/common/patch_explainer.py` - JSON deserialization logic added.
  - `tests/unit/tools/common/test_patch_explainer.py` - Expanded test suite to cover all heuristics.
- **Build status**: Passed
- **Pending issues**: None

## Quality Status
- **Build/test result**: Passed (1703 passed, 56 skipped, 87.69% total codebase coverage)
- **Lint status**: Passed (Ruff and Black check passed)
- **Tests added/modified**: Expanded test suite to 19 tests in `tests/unit/tools/common/test_patch_explainer.py`.

## Loaded Skills
- **Source**: None
- **Local copy**: None
- **Core methodology**: None

## Artifact Index
- /Users/sjkim1127/Reversecore_MCP/.agents/worker_m6_1/handoff.md - Final task report (to be created)
