mcp-mssqlserver

Production-oriented MCP server for Microsoft SQL Server, exposing database operations to MCP clients (Claude Desktop, VS Code Copilot, Cursor, and compatible hosts).

Features

• Query execution (SELECT, INSERT, UPDATE, DELETE)

• Database discovery and schema introspection

• Table metadata inspection (columns, types, nullability, defaults, PK)

• Index and foreign key discovery

• Environment-driven configuration for secure deployment

Related MCP server: sql-mcp-server

Available Tools

Requirements

• Node.js 18+

• Access to a Microsoft SQL Server instance

• Network connectivity from MCP host to SQL Server (host:port)

Configuration

Set connection settings using environment variables:

* Required when MSSQL_AUTH_MODE=sql.

| MCP_TRANSPORT | No | stdio | Transport mode: stdio (default, for npx/Claude Desktop/VS Code) or http (Streamable HTTP, for Docker/remote clients such as n8n) | | MCP_HTTP_PORT | No | 3001 | Port for the HTTP server (only used when MCP_TRANSPORT=http) | | MCP_HTTP_HOST | No | 0.0.0.0 | Bind address for the HTTP server (only used when MCP_TRANSPORT=http) |

Note: the published Docker image always runs in http mode and does not build the msnodesqlv8 native driver (used only for MSSQL_AUTH_MODE=windows). Windows Authentication is only available when running the server directly on a Windows host via npx/npm start.

Usage

Run directly from GitHub

npx github:ferronicardoso/mcp-mssqlserver

Claude Desktop configuration

%APPDATA%\\Claude\\claude_desktop_config.json:

{
  "mcpServers": {
    "mssqlserver": {
      "command": "npx",
      "args": ["github:ferronicardoso/mcp-mssqlserver"],
      "env": {
        "MSSQL_HOST": "localhost",
        "MSSQL_PORT": "1433",
        "MSSQL_DATABASE": "master",
        "MSSQL_AUTH_MODE": "sql",
        "MSSQL_USER": "sa",
        "MSSQL_PASSWORD": "your-password"
      }
    }
  }
}

VS Code MCP configuration

.vscode/mcp.json:

{
  "servers": {
    "mssqlserver": {
      "command": "npx",
      "args": ["github:ferronicardoso/mcp-mssqlserver"],
      "env": {
        "MSSQL_HOST": "localhost",
        "MSSQL_PORT": "1433",
        "MSSQL_DATABASE": "master",
        "MSSQL_AUTH_MODE": "sql",
        "MSSQL_USER": "sa",
        "MSSQL_PASSWORD": "your-password"
      }
    }
  }
}

Run with Docker (HTTP transport)

The published image runs in Streamable HTTP mode by default, for use as a remote MCP endpoint (e.g. from n8n's MCP Client Tool node or any Streamable HTTP-compatible client):

docker run -d --name mcp-mssqlserver \
  -p 3001:3001 \
  -e MSSQL_HOST=host.docker.internal \
  -e MSSQL_PORT=1433 \
  -e MSSQL_DATABASE=master \
  -e MSSQL_AUTH_MODE=sql \
  -e MSSQL_USER=sa \
  -e MSSQL_PASSWORD=your-password \
  ghcr.io/ferronicardoso/mcp-mssqlserver:latest

The MCP endpoint is then available at http://localhost:3001/mcp.

Local Development

git clone https://github.com/ferronicardoso/mcp-mssqlserver
cd mcp-mssqlserver
npm install
npm run build

Start the compiled server:

npm start

Build and Commit Workflow

This repository intentionally tracks dist/ to support npx github:user/repo usage.

The project uses a Husky pre-commit hook to:

1. build TypeScript (npm run build)

2. stage generated artifacts (git add dist)

Manual fallback:

npm run build
git add dist

Security Notes

• Never commit real credentials or .env files.

• Prefer least-privilege SQL users for production use.

• For public or untrusted networks, enable encryption (MSSQL_ENCRYPT=true) and configure certificates appropriately.

Windows Authentication (Integrated Security)

To use Windows Authentication with Integrated Security (process account), configure:

MSSQL_AUTH_MODE=windows
MSSQL_HOST=sqlserver.company.local
MSSQL_PORT=1433
MSSQL_DATABASE=master