db-mcp-server

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

Installation

bash

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)

config.json

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

SQLite over SSH

config.json

{
  "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"
      }
    }
  }
}

config.json

{
  "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

config.json

{
  "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:

config.json

{
  "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