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From OpenAPI spec to MCP: How we built Xata's MCP server
Learn how we built an OpenAPI-driven MCP server using Kubb, custom code generators, and Vercel’s Next.js MCP adapter.
Building an MCP server means exposing a set of “tools” (operations) that a Large Language Model (LLM) can call to perform tasks, for example, fetching data or triggering actions via your backend. Writing an MCP server entirely by hand for a large API would be a massive time sink, manually crafting each tool’s schema and handler is tedious and error-prone, especially when a well-defined OpenAPI spec already exists. Kubb can generate TypeScript types, API clients, React Query hooks, Zod validators, MSW handlers, and even MCP integration code, all from an OpenAPI spec.
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