mariadb-mcp-server

MCP (Model Context Protocol) server for MariaDB/MySQL databases. Provides AI assistants with safe, controlled database access through per-connection read/write permissions.

Features

Multi-connection — manage multiple MariaDB/MySQL databases from a single server
Per-connection access control — read and write flags per connection
Optional limits — statement_timeout_ms, default_row_limit, max_row_limit (all optional, unlimited by default)
SQL guard — validates queries to prevent accidental writes through read tools
Transaction support — atomic multi-query execution on writable connections

Installation

npm install -g @cemalturkcann/mariadb-mcp-server

Or use directly with npx:

npx @cemalturkcann/mariadb-mcp-server

Configuration

The server looks for config.json in this order:

DB_MCP_CONFIG_PATH environment variable
Next to the package (../config.json relative to src/)
Current working directory
~/.config/mariadb-mcp/config.json

If no config is found, a default one is created automatically at ~/.config/mariadb-mcp/config.json with a local read-only connection.

Example config:

{
  "connections": {
    "local": {
      "host": "localhost",
      "port": 3306,
      "user": "root",
      "password": "",
      "description": "Local MariaDB",
      "read": true,
      "write": true
    },
    "production": {
      "host": "db.example.com",
      "port": 3306,
      "user": "readonly_user",
      "password": "secret",
      "database": "mydb",
      "description": "Production (read-only)",
      "read": true,
      "write": false,
      "statement_timeout_ms": 5000,
      "default_row_limit": 50,
      "max_row_limit": 500
    }
  }
}

Connection options

Field	Type	Default	Description
`host`	string	`localhost`	Database host
`port`	number	`3306`	Database port
`user`	string	`root`	Database user
`password`	string	`""`	Database password
`database`	string	`""`	Default database
`description`	string	`""`	Human-readable label
`read`	boolean	`true`	Allow read queries
`write`	boolean	`false`	Allow write queries
`ssl`	boolean/object	`false`	SSL configuration
`statement_timeout_ms`	number	none	Connection timeout (0 or omit = unlimited)
`default_row_limit`	number	none	Default LIMIT for SELECT (0 or omit = unlimited)
`max_row_limit`	number	none	Max allowed LIMIT (0 or omit = unlimited)

MCP Tools

Tool	Description	Requires
`list_connections`	List all configured connections	—
`list_databases`	Show databases on a connection	`read`
`list_tables`	Show tables (optionally in a specific database)	`read`
`describe_table`	Show column definitions	`read`
`execute_select`	Run SELECT / SHOW / DESCRIBE / EXPLAIN queries	`read`
`execute_write`	Run INSERT / UPDATE / DELETE / DDL queries	`write`
`execute_transaction`	Run multiple write queries atomically	`write`
`suggest_query`	Suggest a query for manual review	—

MCP Client Setup

On first run, a default config is created automatically at ~/.config/mariadb-mcp/config.json (Linux/macOS) or %APPDATA%\mariadb-mcp\config.json (Windows). Edit it to add your connections.

Claude Code

Add to ~/.claude.json:

{
  "mcpServers": {
    "mariadb": {
      "command": "npx",
      "args": ["-y", "@cemalturkcann/mariadb-mcp-server"]
    }
  }
}

OpenCode

Add to your opencode.json:

{
  "mcp": {
    "mariadb": {
      "type": "local",
      "command": ["npx", "-y", "@cemalturkcann/mariadb-mcp-server"]
    }
  }
}

Other MCP Clients

Any MCP-compatible client can use this server. The binary name is mariadb-mcp-server and it communicates over stdio. To use a custom config path, set DB_MCP_CONFIG_PATH.

License

MIT

MariaDB MCP Server