polyglot-mcp (Python)

In-process MCP gateway that routes an LLM to database operations across many engines (PostgreSQL, MySQL, SQLite, MongoDB, Redis, S3/MinIO). It wraps the polyglot-core library and exposes each operation as an MCP tool. Connections are pre-registered in a JSON config referenced by POLYGLOT_CONFIG; the LLM only ever passes a connection name.

POLYGLOT_CONFIG=connections.json python -m polyglot_mcp.server

Tools

list_connections, describe_connection, health_check, list_namespaces, list_tables, describe_table, run_query, explain_query, execute, sample_data, count_rows, copy_data.

Transports

Defaults to stdio (Claude Desktop / Claude Code). For a remote/browser client, serve over HTTP: polyglot-mcp --http (or POLYGLOT_TRANSPORT=http), with POLYGLOT_HOST / POLYGLOT_PORT (default 127.0.0.1:8000).

See ../TESTING.md for a natural-language test script you can run from a Claude client, and ../examples/ for a ready-to-use config and docker-compose stack.