SQL-Server-MCP

SQL Server MCP (Model Context Protocol) Server

A lightweight MCP stdio server that connects to Microsoft SQL Server using provided credentials and exposes tools to query and discover schema.

Features

• connect: Connect by server, port, user, password, optional database, encrypt.
• disconnect: Close the pool.
• info: Return @@VERSION.
• query: Execute arbitrary SQL and return recordset.
• list_databases: List databases.
• list_schemas: List schemas.
• list_tables: List tables, with optional schema filter.

Quickstart

• Node.js >= 18
• Install deps and build:

  npm install
  npm run build
  

• Run as an MCP stdio server (for MCP-compatible clients):

  npm start
  

The server starts over stdio and waits to be driven by an MCP client (e.g., Claude Desktop or other MCP-aware tooling). Use the tools in this order:

1. connect with your SQL Server credentials
2. info, list_*, or query

MCP Tools and Schemas

• connect args:

  {
    "server": "host or host\\\u005Cinstance",
    "port": 1433,
    "user": "sa",
    "password": "<secret>",
    "database": "master",
    "encrypt": true
  }
  

• query args:

  { "sql": "SELECT TOP 1 * FROM sys.databases" }
  { "sql": "SELECT * FROM INFORMATION_SCHEMA.TABLES" }
  

• Other tools take no args or optional schema.

Security

• Credentials are provided at call-time and are not stored. Prefer secure MCP clients and environments. TLS encrypt defaults to true.

Development

• Scripts:
  • npm run dev to run with ts-node
  • npm run build to emit JS to dist/
  • npm start to run built server (dist/server.js)

Commits

• chore: init project scaffolding with TypeScript, tsconfig, and deps
• feat: implement MCP stdio server with SQL Server tools (connect, query, info, list_*)
• docs: add execution plan outline and usage notes

License

MIT