Design the API layer for developers to access AI models securely, keys, scopes, limits, and abuse controls.

A reported Anthropic system-design prompt. The skeleton is standard API platform work; the AI-specific 20%, token-denominated limits, safety classifiers in the path, abuse identity, is what the round actually grades.

Updated Aug 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.

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Design the API layer for developers to access AI models securely, keys, scopes, limits, and abuse controls.

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