## 2026-06-26T17:35:52Z
You are the worker agent. Your working directory is `/Users/sjkim1127/Reversecore_MCP/.agents/worker_m4_1/`.
Your mission is to improve the test coverage of `reversecore_mcp/tools/malware/adaptive_vaccine.py` to at least 75% (currently 42%).

1. Read the implementation of `reversecore_mcp/tools/malware/adaptive_vaccine.py` and `tests/unit/tools/malware/test_adaptive_vaccine.py`.
2. Add comprehensive unit tests to `tests/unit/tools/malware/test_adaptive_vaccine.py` covering:
   - `_create_binary_patch` success path (both dry-run and actual patch application). Mock the Capstone engine (`Cs`) and `_va_to_file_offset` and run the tests on a temporary dummy binary file.
   - `_create_binary_patch` when Capstone is unavailable (mock `Cs` module to not be available or throw an exception).
   - `_create_binary_patch` file rollback logic. Mock the file writing operation to raise `IOError` or `OSError` and verify that the original file is safely restored from the backup file.
   - `_va_to_file_offset` logic for PE and ELF formats. Pass mock PE/ELF LIEF binaries with mock sections (virtual address ranges and sizes) and verify offset mappings.
   - `_detect_architecture` logic checking different PE/ELF headers.
   - `_run_lief_vaccine_worker` worker logic.
   - `_is_lief_mocked` branch checking.
3. Run the tests using pytest: `pytest tests/unit/tools/malware/test_adaptive_vaccine.py --cov=reversecore_mcp/tools/malware/adaptive_vaccine.py --cov-report=term-missing`
4. Verify that all tests pass cleanly and coverage of `adaptive_vaccine.py` is >= 75%.
5. Write your changes and handoff report to `/Users/sjkim1127/Reversecore_MCP/.agents/worker_m4_1/handoff.md`.

MANDATORY INTEGRITY WARNING:
DO NOT CHEAT. All implementations must be genuine. DO NOT hardcode test results, create dummy/facade implementations, or circumvent the intended task. A Forensic Auditor will independently verify your work. Integrity violations WILL be detected and your work WILL be rejected.
