← Anthropic Claude Certified Architect – Foundations - 400 Questions

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A company is building an agentic application that calls Claude via the Messages API. After each API response, the application checks the stop_reason field. The response returns stop_reason: "tool_use". What should the application do next?

Extract all tool_use blocks from the response, execute each tool, and send the tool results back as a new user message to continue the loop. Present the assistant's partial response to the end user, since the model has provided a complete answer up to the tool invocation. Terminate the agentic loop because the model has reached a decision point and no further API calls are needed. Retry the same API call with identical messages, waiting for the model to produce an end_turn response instead.

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