---
phase: 06-mcp-server
plan: 02
subsystem: mcp
tags: [installation, dependency-resolution, settings-merge, filesystem]
# Dependency graph
requires:
- phase: 06-01
provides: FastMCP server with 5 tool handlers
- phase: 05-02
provides: Dependency resolver with transitive closure
provides:
- Component installer with filesystem placement
- Settings deep-merge (preserves existing config)
- MetadataStore for component lookup
- Auto dependency resolution before installation
- Conflict detection blocking installation
affects: [07-polish, integration-testing]
# Tech tracking
tech-stack:
added: []
patterns: [deep-merge for JSON configs, path templates for component types]
key-files:
created:
- src/skill_retriever/mcp/installer.py
- src/skill_retriever/memory/metadata_store.py
- tests/test_installer.py
modified:
- src/skill_retriever/mcp/server.py
- src/skill_retriever/memory/__init__.py
- tests/test_mcp_server.py
key-decisions:
- "INSTALL_PATHS maps all 7 ComponentTypes to .claude/ subdirectories"
- "Settings use deep_merge (nested dicts recurse, lists extend with dedupe)"
- "Conflicts block installation entirely (fail-fast)"
- "MetadataStore persists to JSON in temp directory (configurable later)"
patterns-established:
- "deep_merge for JSON config handling"
- "Path templates with {name} placeholder for component installation"
- "Installer returns InstallReport with token costs per component"
# Metrics
duration: 18min
completed: 2026-02-03
---
# Phase 06 Plan 02: Component Installation Summary
**Component installer placing skills/commands/agents into correct .claude/ paths with settings deep-merge and auto dependency resolution**
## Performance
- **Duration:** 18 min
- **Started:** 2026-02-03T12:29:10Z
- **Completed:** 2026-02-03T12:46:56Z
- **Tasks:** 2
- **Files modified:** 6
## Accomplishments
- MetadataStore for JSON-backed component metadata persistence
- INSTALL_PATHS mapping all 7 ComponentTypes to .claude/ subdirectories
- deep_merge function handling nested dicts and list deduplication
- ComponentInstaller with auto dependency resolution and conflict blocking
- install_components tool wired to use ComponentInstaller
- ingest_repo now stores metadata for later installation lookup
## Task Commits
Each task was committed atomically:
1. **Task 1: Create metadata store for component lookup** - `4a50be3` (feat)
2. **Task 2: Create installer and wire to MCP server** - `33d57c9` (feat)
## Files Created/Modified
- `src/skill_retriever/memory/metadata_store.py` - JSON-backed store for ComponentMetadata
- `src/skill_retriever/mcp/installer.py` - Installation engine with INSTALL_PATHS, deep_merge, ComponentInstaller
- `src/skill_retriever/mcp/server.py` - Wired install_components tool to installer, ingest_repo stores metadata
- `src/skill_retriever/memory/__init__.py` - Export MetadataStore
- `tests/test_installer.py` - 23 tests for installer functionality
- `tests/test_mcp_server.py` - 2 additional tests for install tool
## Decisions Made
- **INSTALL_PATHS constant:** Maps ComponentType to .claude/ paths with {name} placeholders
- **deep_merge semantics:** Dicts recurse, lists extend with deduplication, overlay wins for mismatched types
- **Conflict handling:** Conflicts block installation entirely (fail-fast to prevent partial installs)
- **MetadataStore location:** Temp directory for now (configurable in future)
- **pyright ignores:** Added for deep_merge generic dict handling (Any types from JSON parsing)
## Deviations from Plan
None - plan executed exactly as written.
## Issues Encountered
- **Type annotations for deep_merge:** Generic dict[str, Any] required careful type annotations with pyright ignores for recursive calls on unknown dict values
- **Ruff TC003:** Path import needed to be in TYPE_CHECKING block
## User Setup Required
None - no external service configuration required.
## Next Phase Readiness
- MCP server fully functional with all 5 tools implemented
- Installation engine ready for end-to-end testing
- Phase 6 complete - ready for Phase 7 polish/integration
---
*Phase: 06-mcp-server*
*Completed: 2026-02-03*
