mcp-database-tools

MCP server providing SQL and database tools for AI agents. All analysis is performed on SQL text — no actual database connection required.

Tools

sql_format

Format and prettify SQL queries with proper indentation, uppercased keywords, and aligned columns. Supports MySQL, PostgreSQL, and SQLite syntax.

sql_explain

Take a SQL query and explain what it does in plain English, step by step. Identifies query type, tables, columns, conditions, and provides optimization tips.

schema_analyze

Parse CREATE TABLE statements to extract tables, columns, types, constraints, foreign keys, and indexes. Generates an ER diagram in Mermaid format.

query_build

Build SQL queries from natural language descriptions. Supports common patterns like filtering by date, aggregation, joins, ordering, and pagination.

migration_generate

Compare two schemas (old vs new CREATE TABLE statements) and generate ALTER TABLE migration statements. Produces both up (forward) and down (rollback) migrations.

Related MCP server: DB MCP Server

Installation

npm install
npm run build

Usage

With Claude Desktop

Add to your Claude Desktop config (claude_desktop_config.json):

{
  "mcpServers": {
    "database-tools": {
      "command": "node",
      "args": ["path/to/mcp-database-tools/dist/index.js"]
    }
  }
}

Standalone

npm start

Development

npm run build    # Compile TypeScript
npm start        # Run the server

License

MIT