Build a Postgres-Backed MCP Server in 20 Lines with Neon Functions

An MCP server exposes database tools to AI agents via JSON-RPC. Typically, the server and database are on separate hosts, incurring network latency. Neon Functions deploy the MCP server directly onto the database branch, reducing round trips to milliseconds. The core implementation is about 20 lines of TypeScript using Drizzle and Hono.