db-mcp-server

MCP server for MySQL, PostgreSQL, MongoDB, and SQLite databases. One instance per database, no Docker required.

Installation

uvx db-mcp-server

Configuration

Configure via environment variables. Each instance connects to a single database.

MySQL

Variable	Required	Default	Description
DB_TYPE	Yes	—	mysql
DB_DATABASE	Yes	—	Database name
DB_PASSWORD	Yes	—	Password
DB_HOST	No	localhost	Host
DB_PORT	No	3306	Port
DB_USER	No	root	User
DB_MODE	No	read-only	read-only or read-write

PostgreSQL

Variable	Required	Default	Description
DB_TYPE	Yes	—	postgresql
DB_DATABASE	Yes	—	Database name
DB_PASSWORD	Yes	—	Password
DB_HOST	No	localhost	Host
DB_PORT	No	5432	Port
DB_USER	No	postgres	User
DB_MODE	No	read-only	read-only or read-write

MongoDB

Variable	Required	Default	Description
DB_TYPE	Yes	—	mongodb
DB_DATABASE	Yes	—	Database name
DB_URL	Yes	—	Connection URL (mongodb://...)
DB_MODE	No	read-only	read-only or read-write

SQLite

Variable	Required	Default	Description
DB_TYPE	Yes	—	sqlite
DB_PATH	Yes	—	Path to .db file (local or remote with SSH)
DB_DATABASE	No	filename	Display name
DB_MODE	No	read-only	read-only or read-write

SSH Tunnel (MySQL / PostgreSQL)

Optionally connect through an SSH bastion host. Set SSH_HOST to activate.

For SQLite over SSH, the remote .db file is downloaded via SFTP before querying. In read-write mode, changes are uploaded back on shutdown.

Variable	Required	Default	Description
SSH_HOST	No	—	SSH bastion host (activates tunneling)
SSH_PORT	No	22	SSH port
SSH_USER	No	Current OS user	SSH username
SSH_KEY	No	—	Path to private key (~/.ssh/id_rsa)
SSH_PASSWORD	No	—	SSH password (if no key)

At least one of SSH_KEY or SSH_PASSWORD is required when SSH_HOST is set. SSH tunneling is not supported for MongoDB.

Usage in .mcp.json

SQLite (local)

{
  "mcpServers": {
    "db-local": {
      "command": "uvx",
      "args": ["db-mcp-server"],
      "env": {
        "DB_TYPE": "sqlite",
        "DB_PATH": "/path/to/database.db"
      }
    }
  }
}

SQLite over SSH

{
  "mcpServers": {
    "db-remote": {
      "command": "uvx",
      "args": ["db-mcp-server"],
      "env": {
        "DB_TYPE": "sqlite",
        "DB_PATH": "/remote/path/to/database.db",
        "SSH_HOST": "server.example.com",
        "SSH_USER": "deploy",
        "SSH_KEY": "~/.ssh/id_rsa"
      }
    }
  }
}

{
  "mcpServers": {
    "db-prod": {
      "command": "uvx",
      "args": ["db-mcp-server"],
      "env": {
        "DB_TYPE": "mysql",
        "DB_MODE": "read-only",
        "DB_HOST": "db.example.com",
        "DB_PORT": "3306",
        "DB_USER": "root",
        "DB_PASSWORD": "secret",
        "DB_DATABASE": "myapp"
      }
    }
  }
}

With SSH tunnel

{
  "mcpServers": {
    "db-behind-bastion": {
      "command": "uvx",
      "args": ["db-mcp-server"],
      "env": {
        "DB_TYPE": "postgresql",
        "DB_HOST": "10.0.0.5",
        "DB_PORT": "5432",
        "DB_USER": "postgres",
        "DB_PASSWORD": "secret",
        "DB_DATABASE": "myapp",
        "SSH_HOST": "bastion.example.com",
        "SSH_USER": "deploy",
        "SSH_KEY": "~/.ssh/id_rsa"
      }
    }
  }
}

For multiple databases, add multiple instances:

{
  "mcpServers": {
    "db-prod": {
      "command": "uvx",
      "args": ["db-mcp-server"],
      "env": { "DB_TYPE": "mysql", "DB_DATABASE": "prod", "..." : "..." }
    },
    "db-analytics": {
      "command": "uvx",
      "args": ["db-mcp-server"],
      "env": { "DB_TYPE": "postgresql", "DB_DATABASE": "analytics", "..." : "..." }
    },
    "db-staging": {
      "command": "uvx",
      "args": ["db-mcp-server"],
      "env": { "DB_TYPE": "mongodb", "DB_DATABASE": "staging", "..." : "..." }
    }
  }
}

Tools

MySQL

• query — Execute read-only SQL (SELECT, SHOW, DESCRIBE, EXPLAIN, WITH)
• execute — Execute write SQL (INSERT, UPDATE, DELETE) — requires DB_MODE=read-write
• describe — Describe table structure
• list_tables — List all tables
• status — Show connection info

PostgreSQL

• query — Execute read-only SQL (SELECT, SHOW, DESCRIBE, EXPLAIN, WITH)
• execute — Execute write SQL (INSERT, UPDATE, DELETE) — requires DB_MODE=read-write
• describe — Describe table structure (column info from information_schema)
• list_tables — List all tables in the public schema
• status — Show connection info

SQLite

• query — Execute read-only SQL (SELECT, SHOW, DESCRIBE, EXPLAIN, WITH)
• execute — Execute write SQL (INSERT, UPDATE, DELETE) — requires DB_MODE=read-write
• describe — Describe table structure (PRAGMA table_info)
• list_tables — List all tables
• status — Show connection info

MongoDB

• query — Find documents in a collection
• describe — Collection stats ($collStats)
• list_collections — List all collections
• aggregate — Execute aggregation pipelines ($out/$merge blocked on read-only)
• status — Show connection info

License

MIT