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Developer builds type-checker to expose AI coding agents writing outdated SDK APIs

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A developer noticed that AI coding assistants frequently generate code using outdated API calls from older library versions, causing build failures despite the code appearing syntactically correct. To measure this gap objectively, he built a tool called SDKProof, which prompts a model to complete realistic SDK tasks and then runs TypeScript's compiler against the actual installed package to score results. Testing Claude Opus 4 across three major SDKs revealed that Prisma 7 scored 80/100, while Vercel AI SDK and Zod each scored 90/100, with failures tied to renamed or removed options introduced in recent major releases. The pattern shows that models trained before a breaking change tend to reach for the old API by default, with accuracy improving only after enough post-release documentation enters future training data. SDKProof uses the TypeScript compiler rather than another AI model as the judge, making the installed package's type definitions the sole ground truth for scoring.

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