sql mcp server

This project provides a TypeScript implementation of a Model Context Protocol (MCP) server that enables language models and other MCP-compatible clients to query PostgreSQL databases—via SSH bastion tunnels when required.

Built for flexibility and secure database access, it supports AWS RDS with read-only transactions and uses stdin/stdout-based communication, making it suitable for local, containerized, or AI-driven use cases.

Features

• ? SSH bastion support for secure access to private RDS instances via SSH tunnels
• ? PostgreSQL read-only query engine using the pg library
• ? STDIO-based MCP protocol transport
• ? Compatible with memory-bank-mcp-server
• ⚙️ Easily configurable via .env or environment variables
• ? Fully testable with Jest and mocks

Installation

Clone the repository and install dependencies:

git clone https://github.com/your-org/sql-mcp-server.git
cd sql-mcp-server
npm install
npm run build

Configuration (Optional .env file)

Create a .env file in the project root:

DB_USER=postgres
DB_PASS=yourpassword
DB_HOST=localhost
DB_PORT=5432
DB_NAME=mydatabase
USE_SSH_TUNNEL=true
SSH_BASTION_HOST=bastion.example.com
SSH_BASTION_USER=ec2-user
SSH_PRIVATE_KEY_PATH=~/.ssh/id_rsa

Usage

Run the server using npx:

npx -y @modelcontextprotocol/server-postgres postgresql://<user>:<pass>@localhost:5433/<dbname>

For direct connection without SSH tunneling, set the appropriate environment variables:

DB_HOST=rds-host.amazonaws.com DB_PORT=5432 npx -y @modelcontextprotocol/server-postgres postgresql://<user>:<pass>@rds-host.amazonaws.com/<dbname>

Sample Input

{
  "type": "call_tool",
  "params": {
    "name": "query",
    "arguments": {
      "sql": "SELECT * FROM users LIMIT 10"
    }
  }
}

Sample Output

{
  "content": [
    {
      "type": "text",
      "text": "[{"id":1,"name":"Alice"}]"
    }
  ],
  "isError": false
}



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Related Docs
    •   Architecture
    •   Domain Models
    •   Glossary
    •   Coding Standards
    •   Tech Stack
    •   User Guide

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License

MIT

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Contribution Guide

We welcome community contributions! Please see CONTRIBUTING.md for details.

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Compatibility

This implementation follows the Model Context Protocol (MCP) and has been tested for compatibility with:
    •   memory-bank-mcp-server
    •   Claude Desktop (via STDIO)
    •   Cursor IDE
    •   Supabase + MCP integration