DBMcp

  • Golang
  • MCP
  • PostgreSQL
  • MySQL
  • SQLite
GitHub

DBMcp is a Model Context Protocol (MCP) server, written in Go, that lets AI assistants look inside relational databases. It started with PostgreSQL and later picked up MySQL and SQLite.

What it does

  1. Schema introspection

    About 20 tools list tables and views, describe columns and constraints, and dig into foreign keys, triggers, stored functions, sequences, materialized views, and enums (with their values) wherever the database has them.

  2. Column search

    You can look up a column by name across every table and schema.

  3. Parameterized queries

    Every query is parameterized instead of built with string interpolation.

What was hard

  1. Moving to a driver interface

    The first version hard-coded the database type as a string in the session, and every tool branched on it to pick which queries to run. I moved all the database-specific queries behind a Driver interface, so the session now holds a Driver and the tools just call through to it. Capability flags on the interface say what each database supports (SQLite has no enums or sequences, for example), and adding a fourth database means writing exactly one file.