# Handoff Report — explorer_m7_1_2

## 1. Observation
- **Target Source File**: `reversecore_mcp/tools/common/assembler.py`
- **Target Test File**: `tests/unit/tools/common/test_assembler.py`
- **Analysis Output File**: `/Users/sjkim1127/Reversecore_MCP/.agents/explorer_m7_1_2/analysis.md`
- **Direct Command Execution**:
  - Run command: `.venv/bin/pytest tests/unit/tools/common/test_assembler.py -v`
  - Output verbatim coverage:
    ```
    reversecore_mcp/tools/common/assembler.py                 197     81    59%   77-95, 122, 135, 139, 149, 153-163, 166-171, 174-179, 182, 206, 214, 219-222, 225-232, 235-240, 243-248, 251, 322-323, 331, 333, 336-338, 356-362
    ```
  - Keystone import status on local system:
    ```
    ImportError: ERROR: fail to load the dynamic library.
    ```

## 2. Logic Chain
1. The coverage command output demonstrates that `assembler.py` currently achieves only **59%** test coverage.
2. The missing lines fall into:
   - Capstone import-time fallback (77-95)
   - Specific modes for x86 and arm (122, 135, 139, 206, 214)
   - Arm64, Mips, Sparc, Ppc, Systemz mappings (149, 153-163, 166-171, 174-179, 182, 219-222, 225-232, 235-240, 243-248, 251)
   - Exception handling for `KsError` init failure and general assembly compile failures (322-323, 331, 333, 336-338)
   - Capstone warning blocks for invalid disassemblies, unsupported verification, and missing Capstone (356-362)
3. Testing the import-time paths requires mocking `sys.modules` and reloading the module via `importlib.reload`.
4. Testing the parameter mapping blocks requires paramterized tests running all combinations of architecture and mode.
5. Testing exception and warning branches requires mock classes that raise `KsError`, `CsError`, and return empty lists or `None`.

## 3. Caveats
- Keystone's import fails in the local python environment (`.venv`) because of a missing underlying C shared library (`libkeystone.dylib`), which is normal for environments without Keystone natively compiled/installed.
- Thus, the module-level fallback for Keystone (lines 25-45) was covered during initialization in this environment, but in a developer's machine with Keystone fully installed, those lines would be reported as uncovered. The reloading import-error tests handle this dynamically.

## 4. Conclusion
- A precise list of test cases covering all 5 gap categories has been compiled.
- These tests can be safely appended to `tests/unit/tools/common/test_assembler.py`.
- Implementing these changes (via an Implementer agent) will yield 100% coverage for `assembler.py`.

## 5. Verification Method
- Execute the coverage command:
  ```bash
  .venv/bin/pytest --cov=reversecore_mcp.tools.common.assembler tests/unit/tools/common/test_assembler.py --cov-report=term-missing
  ```
- Verify `reversecore_mcp/tools/common/assembler.py` output line shows `100%`.
- Invalidation condition: If python exits with error 4 due to nanobind leak warnings, ensure `--cov-branch` is not specified, as tracing hooks interact poorly with nanobind refcounts.
