# BRIEFING — 2026-06-26T22:25:46Z

## Mission
Analyze patch_explainer.py, inspect the return schema of diff_binaries, construct mock payloads, and plan integration/unit testing for patch explainer coverage.

## 🔒 My Identity
- Archetype: Teamwork Explorer
- Roles: Read-only investigator, analyzer
- Working directory: /Users/sjkim1127/Reversecore_MCP/.agents/explorer_m6_3
- Original parent: 0c44a811-b4db-47e1-891b-60482d466a84
- Milestone: Milestone 6 (patch_explainer.py coverage)

## 🔒 Key Constraints
- Read-only investigation — do NOT implement
- CODE_ONLY network mode: no external HTTP/Web access
- All results, reports, and updates must be communicated back to the caller using send_message
- Code changes must NOT be implemented; only analysis, diff patches, replacement files, or code snippets in reports are permitted

## Current Parent
- Conversation ID: 0c44a811-b4db-47e1-891b-60482d466a84
- Updated: 2026-06-26T22:25:46Z

## Investigation State
- **Explored paths**:
  - `reversecore_mcp/tools/common/patch_explainer.py`
  - `reversecore_mcp/tools/analysis/diff_tools.py`
  - `tests/unit/tools/common/test_patch_explainer.py`
  - `reversecore_mcp/core/result.py`
- **Key findings**:
  - Found a critical `AttributeError` type mismatch bug in `explain_patch` where it expects `diff_result.data` to be a dict, but `diff_binaries` actually returns a JSON-serialized string.
  - Discovered that unit tests passed only because `diff_binaries` was mocked incorrectly (mock lie) to return a dict, and because `changes` was empty, triggering an early success exit.
  - Designed mock payloads that replicate the correct schemas and verify all code paths and heuristics (API hardening, security checks, integer overflow checks, logic removal).
- **Unexplored areas**: None. The investigation is complete.

## Key Decisions Made
- Generated a precise patch file (`proposed_patch.patch`) to be applied by the implementer.
- Formulated the exact mock payloads and a comprehensive test plan to hit 100% code coverage.

## Artifact Index
- /Users/sjkim1127/Reversecore_MCP/.agents/explorer_m6_3/ORIGINAL_REQUEST.md — Archive of the starting request
- /Users/sjkim1127/Reversecore_MCP/.agents/explorer_m6_3/BRIEFING.md — Current briefing and state index
- /Users/sjkim1127/Reversecore_MCP/.agents/explorer_m6_3/progress.md — Progress log
- /Users/sjkim1127/Reversecore_MCP/.agents/explorer_m6_3/analysis.md — Schema analysis and testing plan
- /Users/sjkim1127/Reversecore_MCP/.agents/explorer_m6_3/proposed_patch.patch — Machine-applicable patch for source and unit tests
