Task #19 Complete: MCP Server Integration for Vector Databases

Task #19 Complete: MCP Server Integration for Vector Databases

Completion Date: February 7, 2026 Status: ✅ Complete Tests: 8/8 passing

Objective

Extend the MCP server to expose the 4 new vector database adaptors (Weaviate, Chroma, FAISS, Qdrant) as MCP tools, enabling Claude AI assistants to export skills directly to vector databases.

Implementation Summary

Files Created

1. src/skill_seekers/mcp/tools/vector_db_tools.py (500+ lines)

   • 4 async implementation functions
   • Comprehensive docstrings with examples
   • Error handling for missing directories/adaptors
   • Usage instructions with code examples
   • Links to official documentation

2. tests/test_mcp_vector_dbs.py (274 lines)

   • 8 comprehensive test cases
   • Test fixtures for skill directories
   • Validation of exports, error handling, and output format
   • All tests passing (8/8)

Files Modified

1. src/skill_seekers/mcp/tools/init.py

   • Added vector_db_tools module to docstring
   • Imported 4 new tool implementations
   • Added to all exports

2. src/skill_seekers/mcp/server_fastmcp.py

   • Updated docstring from "21 tools" to "25 tools"
   • Added 6th category: "Vector Database tools"
   • Imported 4 new implementations (both try/except blocks)
   • Registered 4 new tools with @safe_tool_decorator
   • Added VECTOR DATABASE TOOLS section (125 lines)

New MCP Tools

1. export_to_weaviate

Description: Export skill to Weaviate vector database format (hybrid search, 450K+ users)

Parameters:

• skill_dir (str): Path to skill directory
• output_dir (str, optional): Output directory

Output: JSON file with Weaviate schema, objects, and configuration

Usage Instructions Include:

• Python code for uploading to Weaviate
• Hybrid search query examples
• Links to Weaviate documentation

2. export_to_chroma

Description: Export skill to Chroma vector database format (local-first, 800K+ developers)

Parameters:

• skill_dir (str): Path to skill directory
• output_dir (str, optional): Output directory

Output: JSON file with Chroma collection data

Usage Instructions Include:

• Python code for loading into Chroma
• Query collection examples
• Links to Chroma documentation

3. export_to_faiss

Description: Export skill to FAISS vector index format (billion-scale, GPU-accelerated)

Parameters:

• skill_dir (str): Path to skill directory
• output_dir (str, optional): Output directory

Output: JSON file with FAISS embeddings, metadata, and index config

Usage Instructions Include:

• Python code for building FAISS index (Flat, IVF, HNSW options)
• Search examples
• Index saving/loading
• Links to FAISS documentation

4. export_to_qdrant

Description: Export skill to Qdrant vector database format (native filtering, 100K+ users)

Parameters:

• skill_dir (str): Path to skill directory
• output_dir (str, optional): Output directory

Output: JSON file with Qdrant collection data and points

Usage Instructions Include:

• Python code for uploading to Qdrant
• Search with filters examples
• Links to Qdrant documentation

Test Coverage

Test Cases (8/8 passing)

1. test_export_to_weaviate - Validates Weaviate export with output verification
2. test_export_to_chroma - Validates Chroma export with output verification
3. test_export_to_faiss - Validates FAISS export with output verification
4. test_export_to_qdrant - Validates Qdrant export with output verification
5. test_export_with_default_output_dir - Tests default output directory behavior
6. test_export_missing_skill_dir - Validates error handling for missing directories
7. test_all_exports_create_files - Validates file creation for all 4 exports
8. test_export_output_includes_instructions - Validates usage instructions in output

Test Results

tests/test_mcp_vector_dbs.py::test_export_to_weaviate PASSED
tests/test_mcp_vector_dbs.py::test_export_to_chroma PASSED
tests/test_mcp_vector_dbs.py::test_export_to_faiss PASSED
tests/test_mcp_vector_dbs.py::test_export_to_qdrant PASSED
tests/test_mcp_vector_dbs.py::test_export_with_default_output_dir PASSED
tests/test_mcp_vector_dbs.py::test_export_missing_skill_dir PASSED
tests/test_mcp_vector_dbs.py::test_all_exports_create_files PASSED
tests/test_mcp_vector_dbs.py::test_export_output_includes_instructions PASSED

8 passed in 0.35s

Integration Architecture

MCP Server Structure

MCP Server (25 tools, 6 categories)
├── Config tools (3)
├── Scraping tools (8)
├── Packaging tools (4)
├── Splitting tools (2)
├── Source tools (4)
└── Vector Database tools (4) ← NEW
    ├── export_to_weaviate
    ├── export_to_chroma
    ├── export_to_faiss
    └── export_to_qdrant

Tool Implementation Pattern

Each tool follows the FastMCP pattern:

@safe_tool_decorator(description="...")
async def export_to_<target>(
    skill_dir: str,
    output_dir: str | None = None,
) -> str:
    """Tool docstring with args and returns."""
    args = {"skill_dir": skill_dir}
    if output_dir:
        args["output_dir"] = output_dir

    result = await export_to_<target>_impl(args)
    if isinstance(result, list) and result:
        return result[0].text if hasattr(result[0], "text") else str(result[0])
    return str(result)

Usage Examples

Claude Desktop MCP Config

{
  "mcpServers": {
    "skill-seeker": {
      "command": "python",
      "args": ["-m", "skill_seekers.mcp.server_fastmcp"]
    }
  }
}

Using Vector Database Tools

Example 1: Export to Weaviate

export_to_weaviate(
    skill_dir="output/react",
    output_dir="output"
)

Example 2: Export to Chroma with default output

export_to_chroma(skill_dir="output/django")

Example 3: Export to FAISS

export_to_faiss(
    skill_dir="output/fastapi",
    output_dir="/tmp/exports"
)

Example 4: Export to Qdrant

export_to_qdrant(skill_dir="output/vue")

Output Format Example

Each tool returns comprehensive instructions:

✅ Weaviate Export Complete!

📦 Package: react-weaviate.json
📁 Location: output/
📊 Size: 45,678 bytes

🔧 Next Steps:
1. Upload to Weaviate:
   ```python
   import weaviate
   import json

   client = weaviate.Client("http://localhost:8080")
   data = json.load(open("output/react-weaviate.json"))

   # Create schema
   client.schema.create_class(data["schema"])

   # Batch upload objects
   with client.batch as batch:
       for obj in data["objects"]:
           batch.add_data_object(obj["properties"], data["class_name"])

2. Query with hybrid search:

   result = client.query.get(data["class_name"], ["content", "source"]) \
       .with_hybrid("React hooks usage") \
       .with_limit(5) \
       .do()
   

📚 Resources:

• Weaviate Docs: https://weaviate.io/developers/weaviate
• Hybrid Search: https://weaviate.io/developers/weaviate/search/hybrid

---

## Technical Achievements

### 1. Consistent Interface

All 4 tools share the same interface:
- Same parameter structure
- Same error handling pattern
- Same output format (TextContent with detailed instructions)
- Same integration with existing adaptors

### 2. Comprehensive Documentation

Each tool includes:
- Clear docstrings with parameter descriptions
- Usage examples in output
- Python code snippets for uploading
- Query examples for searching
- Links to official documentation

### 3. Robust Error Handling

- Missing skill directory detection
- Adaptor import failure handling
- Graceful fallback for missing dependencies
- Clear error messages with suggestions

### 4. Complete Test Coverage

- 8 test cases covering all scenarios
- Fixture-based test setup for reusability
- Validation of structure, content, and files
- Error case testing

---

## Impact

### MCP Server Expansion

- **Before:** 21 tools across 5 categories
- **After:** 25 tools across 6 categories (+19% growth)
- **New Capability:** Direct vector database export from MCP

### Vector Database Support

- **Weaviate:** Hybrid search (vector + BM25), 450K+ users
- **Chroma:** Local-first development, 800K+ developers
- **FAISS:** Billion-scale search, GPU-accelerated
- **Qdrant:** Native filtering, 100K+ users

### Developer Experience

- Claude AI assistants can now export skills to vector databases directly
- No manual CLI commands needed
- Comprehensive usage instructions included
- Complete end-to-end workflow from scraping to vector database

---

## Integration with Week 2 Adaptors

Task #19 completes the MCP integration of Week 2's vector database adaptors:

| Task | Feature | MCP Integration |
|------|---------|-----------------|
| #10 | Weaviate Adaptor | ✅ export_to_weaviate |
| #11 | Chroma Adaptor | ✅ export_to_chroma |
| #12 | FAISS Adaptor | ✅ export_to_faiss |
| #13 | Qdrant Adaptor | ✅ export_to_qdrant |

---

## Next Steps (Week 3)

With Task #19 complete, Week 3 can begin:

- **Task #20:** GitHub Actions automation
- **Task #21:** Docker deployment
- **Task #22:** Kubernetes Helm charts
- **Task #23:** Multi-cloud storage (S3, GCS, Azure Blob)
- **Task #24:** API server for embedding generation
- **Task #25:** Real-time documentation sync
- **Task #26:** Performance benchmarking suite
- **Task #27:** Production deployment guides

---

## Files Summary

### Created (2 files, ~800 lines)

- `src/skill_seekers/mcp/tools/vector_db_tools.py` (500+ lines)
- `tests/test_mcp_vector_dbs.py` (274 lines)

### Modified (3 files)

- `src/skill_seekers/mcp/tools/__init__.py` (+16 lines)
- `src/skill_seekers/mcp/server_fastmcp.py` (+140 lines)
- (Updated: tool count, imports, new section)

### Total Impact

- **New Lines:** ~800
- **Modified Lines:** ~150
- **Test Coverage:** 8/8 passing
- **New MCP Tools:** 4
- **MCP Tool Count:** 21 → 25

---

## Lessons Learned

### What Worked Well ✅

1. **Consistent patterns** - Following existing MCP tool structure made integration seamless
2. **Comprehensive testing** - 8 test cases caught all edge cases
3. **Clear documentation** - Usage instructions in output reduce support burden
4. **Error handling** - Graceful degradation for missing dependencies

### Challenges Overcome ⚡

1. **Async testing** - Converted to synchronous tests with asyncio.run() wrapper
2. **pytest-asyncio unavailable** - Used run_async() helper for compatibility
3. **Import paths** - Careful CLI_DIR path handling for adaptor access

---

## Quality Metrics

- **Test Pass Rate:** 100% (8/8)
- **Code Coverage:** All new functions tested
- **Documentation:** Complete docstrings and usage examples
- **Integration:** Seamless with existing MCP server
- **Performance:** Tests run in <0.5 seconds

---

**Task #19: MCP Server Integration for Vector Databases - COMPLETE ✅**

**Ready for Week 3 Task #20: GitHub Actions Automation**