sql-mcp

sql-mcp

Local MCP server exposed over HTTP that runs inside Docker and provides a single query tool against a PostgreSQL database supplied via DATABASE_URL.

Configure

cp .env.example .env
# edit .env and set DATABASE_URL

Run with Docker

docker compose up --build

The MCP endpoint is then available at http://localhost:3000/mcp.

Run locally (without Docker)

npm install
npm run build
npm start
# or, for hot reload:
npm run dev

Register with an MCP client

Point your MCP-compatible client at the streamable HTTP endpoint:

http://localhost:3000/mcp

The transport is streamable-http. Initialize the session with a standard MCP initialize request; subsequent requests must include the mcp-session-id header returned by the server.

Tool

• query({ sql: string, params?: unknown[] }) — runs a parameterized SQL statement and returns { command, rowCount, rows } as JSON. Use $1, $2, ... in sql and pass values in params.