The agent harness performance optimization system. Skills, instincts, memory, security, and research-first development for Claude Code, Codex, Opencode, Cursor and beyond.
Dbhub
Token conscious database MCP server for Postgres, MySQL, SQL Server, Oracle, MariaDB, SQLite.
Install
$
npx @bytebase/dbhub@latest --transport http --port 8080 --dsn "postgres://user:password@localhost:5432/dbname?sslmode=disable"Claude Code
claude mcp add dbhub -- npx @bytebase/dbhub@latest --transport http --port 8080 --dsn "postgres://user:password@localhost:5432/dbname?sslmode=disable"Cursor / Claude Desktop (mcp.json)
{
"mcpServers": {
"dbhub": {
"command": "npx",
"args": [
"@bytebase/dbhub@latest",
"--transport",
"http",
"--port",
"8080",
"--dsn",
"\"postgres://user:password@localhost:5432/dbname?sslmode=disable\""
]
}
}
}Install command taken from the project's README or registry entry. Always review code before running it.
README excerpt
Read full README on GitHub →[!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 Databases
DBHub 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:
- Minimal: Zero dependency, token efficient with a minimal set of MCP tools to maximize context window
- Multi-Database: PostgreSQL, MySQL, MariaDB, SQL Server, Oracle, and SQLite through a single interface
- Multi-Connection: Connect to multiple databases simultaneously with TOML configuration
- Guardrails: Read-only mode, row limiting, and query timeout to prevent runaway operations
- Secure Access: SSH tunneling and SSL/TLS encryption
DBHub is the official example in the Claude Code docs for connecting to PostgreSQL via MCP.
Token Efficiency
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 |
Use Cases
- Local Development: Schema exploration, query validation, and data debugging with Claude Code, VS Code, Cursor, etc.
- Non-Technical Access: Expose curated, read-only views to non-technical staff via Claude Desktop, VS Code, Cursor, etc.
- Multi-Database Consolidation: Replace separate MCP servers for each database with a single DBHub process
- Production Troubleshooting: Read-only diagnostics with guardrails against runaway queries
Supported Databases
PostgreSQL, MySQL, SQL Server, MariaDB, Oracle, and SQLite.
MCP Tools
DBHub implements MCP tools for database operations:
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