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A developer is making their first POST request to the Claude Messages API (/v1/messages). Which set of top-level parameters is required in every request body?

Practice questions based on the official Claude Certified Developer – Foundations (CCDV-F) exam guide and Anthropic's public documentation. This is an independent study tool, not affiliated with or endorsed by Anthropic, and does not grant certification. The real exam is 53 questions, 120 minutes, passing at a scaled 720/1000, delivered via Pearson VUE ($125).

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