MCP server for semantic code search with PostgreSQL and pgvector
npm install @crewchief/maproom-mcpMCP server for semantic code search powered by SQLite and your choice of embedding provider.
> Major version update: v3.0.0 simplifies the package to a single-purpose MCP server.
- Removed: setup, scan, watch CLI subcommands
- Removed: Docker orchestration (container management)
- New: Database must exist before MCP server starts
- New: MCP server runs on host via npx, not in a container
VSCode Extension Users: No changes required. The extension handles database setup.
CLI Users: See Migration from v2.x below.
- Fast Hybrid Search - Vector similarity + full-text search with SQLite
- Semantic Ranking - Implementations rank higher than tests or docs
- Choice of Providers - OpenAI (recommended), Google Vertex AI, or Ollama
- Multi-Language - Tree-sitter parsing for TypeScript, JavaScript, Rust, and more
Install the Maproom extension which handles everything automatically.
Add to your editor's MCP configuration:
``json`
{
"servers": {
"maproom": {
"command": "npx",
"args": ["-y", "@crewchief/maproom-mcp"],
"env": {
"MAPROOM_DATABASE_URL": "sqlite:///Users/you/.maproom/maproom.db",
"MAPROOM_EMBEDDING_PROVIDER": "openai",
"OPENAI_API_KEY": "${env:OPENAI_API_KEY}"
}
}
}
}
| Variable | Description | Required |
|----------|-------------|----------|
| MAPROOM_DATABASE_URL | SQLite database URL | Auto-detected¹ |MAPROOM_EMBEDDING_PROVIDER
| | openai, google, or ollama | Yes |OPENAI_API_KEY
| | OpenAI API key | If provider=openai |GOOGLE_APPLICATION_CREDENTIALS
| | Google credentials path | If provider=google |
¹ Auto-detection: MAPROOM_DATABASE_URL > ~/.maproom/maproom.db
- search - Semantic search with FTS, vector, or hybrid modes
- open - Get code by file path with line ranges
- context - Related chunks (imports, callers, tests)
- status - Index statistics
- scan - Full repository indexing
- upsert - Update specific files
If you were using the CLI commands (setup, scan, watch), follow these steps:
`bashInstall the CLI if needed
npm install -g @crewchief/cli
$3
Add the MCP configuration above to your editor.
Database Connection
The MCP server auto-detects the database URL:
1. Explicit: Uses
if set (must be sqlite://...)
2. Default: Uses ~/.maproom/maproom.dbRequirements
- Node.js 18+
- SQLite database (auto-created on first scan)
- One of: OpenAI API key, Google credentials, or Ollama installation
Semantic Ranking
Search results prioritize implementations over tests and documentation:
Query: "authenticate"Before: 1. Documentation: "Auth Guide" ← Not what you want
After: 1. Function: authenticate() ← Found immediately!
Enable debug mode to see score breakdowns:
typescript
const results = await search({ query: 'authenticate', debug: true })
``- Confidence Scoring - Assess search result quality with confidence signals
- Semantic Ranking - How implementations rank higher than tests and docs
- Usage Patterns - Common search patterns and best practices
- Examples - Detailed search examples
- GitHub Issues
- Documentation
MIT