AI coding assistants keep writing your library's old API. When a library ships a new major version, the model still writes the previous version's code from memory — it looks right, but it doesn't compile against the version you actually have installed.

SDKProof measures exactly how often that happens. It gives an AI model real coding tasks for a library, then type-checks the generated code against the real installed package. Compiles = pass. No AI judging another AI — the compiler decides.

Scores so far: Prisma 80, Vercel AI SDK 90, Zod 90, Next.js 92, TanStack Query 100. The pattern: the more recently a library changed, the more the AI gets wrong.

Open source — run it on any TypeScript package. sdkproof.dev