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brent.edwards 34c6972a05 feat(tool): implement BuiltinAdapter class and MCP automatic resource slot creation (#964)
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## Summary

Implement `BuiltinAdapter` class and MCP automatic resource slot creation. Two main changes:

### 1. BuiltinAdapter Class (`tool/builtins/adapter.py`)
Formal adapter implementing the tool adapter lifecycle pattern for built-in tools:
- `discover()` — returns all built-in tool descriptors (file, git, subplan tools)
- `register(registry)` — registers all tools in a ToolRegistry, returns registered names
- `activate()`/`deactivate()` — no-ops (built-in tools are always available)
- Wraps existing `ALL_FILE_TOOLS`, `ALL_GIT_TOOLS`, `ALL_SUBPLAN_TOOLS` lists
- Backward compatible — existing registration functions still work

### 2. MCP Resource Slot Inference (`mcp/adapter.py`)
New `infer_resource_slots()` static method on `MCPToolAdapter`:
- Scans MCP tool parameter schemas for file/directory/repo patterns
- Creates `ResourceSlot` objects with appropriate type, access mode, binding mode
- Mapping: `file_path`→file(rw), `directory`→directory(ro), `repo_path`→git-checkout(rw)
- Slots stored in `source_metadata["resource_slots"]` on registered `ToolSpec` objects

### Quality Gates

| Session | Result |
|---|---|
| `nox -s lint` | PASS |
| `nox -s typecheck` | PASS (0 errors) |
| `nox -s unit_tests` | PASS (10,817 scenarios) |
| `nox -s integration_tests` | PASS (6 new tests) |
| `nox -s coverage_report` | 97% (>= 97%) |

Closes #882

Reviewed-on: #964
Co-authored-by: Brent E. Edwards <brent.edwards@cleverthis.com>
Co-committed-by: Brent E. Edwards <brent.edwards@cleverthis.com>
2026-03-21 05:30:01 +00:00