# BRIEFING — 2026-06-26T22:26:00Z

## Mission
Analyze edge cases, exception paths, and heuristics in `reversecore_mcp/tools/common/patch_explainer.py` to design comprehensive tests.

## 🔒 My Identity
- Archetype: explorer
- Roles: Teamwork explorer, investigator, analyst
- Working directory: /Users/sjkim1127/Reversecore_MCP/.agents/explorer_m6_2/
- Original parent: 0c44a811-b4db-47e1-891b-60482d466a84
- Milestone: Milestone 6 (patch_explainer.py coverage) Analysis 2

## 🔒 Key Constraints
- Read-only investigation — do NOT implement

## Current Parent
- Conversation ID: 0c44a811-b4db-47e1-891b-60482d466a84
- Updated: not yet

## Investigation State
- **Explored paths**:
  - `reversecore_mcp/tools/common/patch_explainer.py` (target source file)
  - `tests/unit/tools/common/test_patch_explainer.py` (test suite)
  - `reversecore_mcp/tools/analysis/diff_tools.py` (dependency API details)
  - `reversecore_mcp/tools/radare2/r2ghidra_tools.py` (dependency API details)
  - `reversecore_mcp/core/result.py` (result wrapper classes)
- **Key findings**:
  - Identified 6 main logic branches in `explain_patch`, 5 heuristics in `_generate_explanation`, and 1 line-limiting constraint in `_generate_diff_snippet`.
  - Found that the current `test_success` test was bypassing the core analysis loop because its mock data for `diff_binaries` was missing the `"changes"` field, causing it to exit early on `not changes`.
  - Designed the exact mock objects and configurations to test all these uncovered paths.
- **Unexplored areas**: None. The analysis of `patch_explainer.py` is complete.

## Key Decisions Made
- Use the real `success` and `failure` constructors from `reversecore_mcp.core.result` in our proposed tests to guarantee mock compatibility with FastMCP's result structures.

## Artifact Index
- /Users/sjkim1127/Reversecore_MCP/.agents/explorer_m6_2/ORIGINAL_REQUEST.md — Original request and context
- /Users/sjkim1127/Reversecore_MCP/.agents/explorer_m6_2/task.md — Task description
- /Users/sjkim1127/Reversecore_MCP/.agents/explorer_m6_2/BRIEFING.md — Current status and working memory
- /Users/sjkim1127/Reversecore_MCP/.agents/explorer_m6_2/analysis.md — Detailed analysis report and proposed test cases
- /Users/sjkim1127/Reversecore_MCP/.agents/explorer_m6_2/progress.md — Progress tracker
