# Handoff Report — 2026-06-27T02:23:45+09:00

## 1. Observation
In `reversecore_mcp/tools/analysis/capa_tools.py`:
- `high_risk_namespaces` in `run_capa` (lines 135-143) was:
  ```python
  high_risk_namespaces = [
      "anti-analysis",
      "collection",
      "command-and-control",
      "defense-evasion",
      "exfiltration",
      "impact",
      "persistence",
  ]
  ```
  which lacked `"execution"`, while `run_capa_quick` included `"execution"` (line 199).
- `high_risk_count` in `run_capa` was calculated using:
  ```python
  high_risk_count = sum(
      result["summary"]["namespaces"].get(ns, 0) for ns in high_risk_namespaces
  )
  ```
  which performed an exact dictionary lookup and could not handle hierarchical namespaces like `"defense-evasion/obfuscation"`.

In `tests/unit/tools/analysis/test_capa_tools.py`:
- The mocked namespace names inside `test_run_capa_success` were non-hierarchical, e.g. `"defense-evasion"` on line 96 and `"persistence"` on line 106:
  ```python
  mock_rule1.meta = {
      "namespace": "defense-evasion",
      ...
  }
  ```

## 2. Logic Chain
- Adding `"execution"` to `high_risk_namespaces` in `run_capa` aligns the high-risk categories list with `run_capa_quick`.
- Checking if any namespace starts with or contains any of the high-risk category names allows the count to correctly identify hierarchical namespaces like `"defense-evasion/obfuscation"`. This is achieved by iterating over the dictionary entries and matching:
  ```python
  for ns_name, count in result["summary"]["namespaces"].items():
      if any(ns_name.startswith(hr_ns) or hr_ns in ns_name for hr_ns in high_risk_namespaces):
          high_risk_count += count
  ```
- Changing mocked rules in `test_run_capa_success` to `"defense-evasion/obfuscation"` and `"persistence/registry"` (and updating the assertions) verifies the correctness of the new prefix/substring matching logic.
- Executing the test command `pytest tests/unit/tools/analysis/test_capa_tools.py --cov=reversecore_mcp/tools/analysis/capa_tools.py --cov-report=term-missing` verifies everything works properly with 100% coverage.

## 3. Caveats
No caveats.

## 4. Conclusion
The namespace bugs in `capa_tools.py` are resolved. The high-risk namespaces are aligned, hierarchical namespace matching operates correctly, and all unit tests pass with 100% code coverage.

## 5. Verification Method
Run the following commands:
- **Pytest command**:
  ```bash
  pytest tests/unit/tools/analysis/test_capa_tools.py --cov=reversecore_mcp/tools/analysis/capa_tools.py --cov-report=term-missing
  ```
  Ensure all 12 tests pass cleanly and coverage for `capa_tools.py` remains at 100%.
- **Files to inspect**:
  - `reversecore_mcp/tools/analysis/capa_tools.py`
  - `tests/unit/tools/analysis/test_capa_tools.py`
