# BRIEFING — 2026-06-27T02:40:00+09:00

## Mission
Improve the test coverage of `reversecore_mcp/tools/malware/adaptive_vaccine.py` to at least 75%.

## 🔒 My Identity
- Archetype: worker
- Roles: implementer, qa, specialist
- Working directory: /Users/sjkim1127/Reversecore_MCP/.agents/worker_m4_1/
- Original parent: 84eb1185-eda1-4884-b753-abb8b674321f
- Milestone: Test coverage improvement for adaptive_vaccine

## 🔒 Key Constraints
- CODE_ONLY network mode: no external HTTP/HTTPS access.
- Minimal change principle.
- No dummy/facade implementations or hardcoded test results.
- Minimum coverage of `adaptive_vaccine.py` >= 75%.

## Current Parent
- Conversation ID: 84eb1185-eda1-4884-b753-abb8b674321f
- Updated: 2026-06-27T02:40:00+09:00

## Task Summary
- **What to build/improve**: Add unit tests in `tests/unit/tools/malware/test_adaptive_vaccine.py` covering success paths, missing branches, error handling, mock formats (PE/ELF), rollback, arch detection, worker logic, and lief check logic.
- **Success criteria**: Test coverage of `reversecore_mcp/tools/malware/adaptive_vaccine.py` >= 75%, and all tests pass.
- **Interface contracts**: `reversecore_mcp/tools/malware/adaptive_vaccine.py`
- **Code layout**: `tests/unit/tools/malware/test_adaptive_vaccine.py`

## Key Decisions Made
- Used mock dictionary patching of `sys.modules` for the isolated worker (`_run_lief_vaccine_worker`) since local imports inside the worker bypassed normal module-level patches.
- Wrapped Python file open wrapper around the actual file handle to cleanly mock file write (`f.write`) failures for verifying binary patching rollback safety.
- Handled mock class validation dynamically so `isinstance` checks against `lief.PE.Binary` and `lief.ELF.Binary` work correctly when `lief` is fully mocked.

## Change Tracker
- **Files modified**:
  - `tests/unit/tools/malware/test_adaptive_vaccine.py` — Added TestCreateBinaryPatch, TestVaToFileOffset, TestDetectArchitectureExtra, and TestLiefVaccineWorkerAndMockChecking classes. Added imports. Updated async mock patch tests.
- **Build status**: Pass (64 tests passed successfully)
- **Pending issues**: None

## Quality Status
- **Build/test result**: Pass (64 tests passed, 0 failed)
- **Lint status**: 0 violations (ruff check passed cleanly)
- **Tests added/modified**: Test cases for `_create_binary_patch` success/failure/rollback, `_va_to_file_offset` for PE/ELF, `_detect_architecture` for PE/ELF machine types, `_run_lief_vaccine_worker` parsing, and `_is_lief_mocked` variants.

## Loaded Skills
- None loaded.

## Artifact Index
- `/Users/sjkim1127/Reversecore_MCP/tests/unit/tools/malware/test_adaptive_vaccine.py` — Unit tests for adaptive vaccine tool
