gem-hunter
Language: TypeScript
Token conscious database MCP server for Postgres, MySQL, SQL Server, Oracle, MariaDB, SQLite.
Note
If you need an enterprise-level database MCP server with built-in guardrails like approval flow, access control, data masking, and audit logging beyond what DBHub offers, check out Bytebase.
+------------------+ +--------------+ +------------------+
| | | | | |
| Claude Desktop +--->+ +--->+ PostgreSQL |
| | | | | |
| Claude Code +--->+ +--->+ SQL Server |
| | | | | |
| Cursor +--->+ DBHub +--->+ Oracle |
| | | | | |
| VS Code +--->+ +--->+ SQLite |
| | | | | |
| Copilot CLI +--->+ +--->+ MySQL |
| | | | | |
| | | +--->+ MariaDB |
| | | | | |
+------------------+ +--------------+ +------------------+
MCP Clients MCP Server DatabasesDBHub is a minimal MCP server: token-efficient, zero-dependency, and just two tools by default with opt-in extras. This lightweight gateway allows MCP-compatible clients to connect to and explore different databases:
DBHub is the official example in the Claude Code docs for connecting to PostgreSQL via MCP.
DBHub loads just 2 tools by default at 1.4k tokens — 13-14x fewer than alternatives — keeping the context window open for your actual work.
| MCP Server | Default Config | Default Tools |
|---|---|---|
| DBHub | 1.4k | 2 (execute_sql, search_objects) |
| MCP Toolbox | 19.0k | 28 |
| Supabase MCP | 19.3k | all |
PostgreSQL, MySQL, SQL Server, MariaDB, Oracle, and SQLite.
DBHub implements MCP tools for database operations:
dbhub.toml configuration fileDBHub includes a built-in web interface for interacting with your database tools. It provides a visual way to execute queries, run custom tools, and view request traces without requiring an MCP client.
npx @bytebase/dbhub@latest --transport http --port 8080 --dsn "postgres://user:password@localhost:5432/dbname?sslmode=disable"Also available as:
See the Installation Guide for all options, Command-Line Options for parameters, and Multi-Database Configuration for connecting several databases at once.
Requires Node.js >= 22.5.0 (DBHub uses the built-in node:sqlite module).
# Install dependencies pnpm install # Run in development mode pnpm dev # Build and run for production pnpm build && pnpm start --transport stdio --dsn "postgres://user:password@localhost:5432/dbname"