Agent Loop & Stop Reason — CCDV-F Practice Question
A representative Claude Certified Developer - Foundations (CCDV-F) exam question on Agent Loop & Stop Reason. Work through it below, then read why each option is right or wrong.
This question is part of the free Claude Certified Developer - Foundations practice test.
Short answer
The correct answer is C. Execute the requested allowed tool, append the tool result to the conversation, and call the model again.
A tool-use stop indicates that the model is waiting for a tool result. The client must execute the authorized tool, return a correctly formed result block, and continue the loop.
The Question
A custom agent receives an assistant response whose stop reason indicates tool use. What should the application do next?
Why C is correct
A tool-use stop indicates that the model is waiting for a tool result. The client must execute the authorized tool, return a correctly formed result block, and continue the loop.
Why the other options are wrong
Option A does not satisfy the requirement in the scenario. Review the explanation above: the correct choice (C) is the only one that fully meets every constraint stated in the question.
Option B does not satisfy the requirement in the scenario. Review the explanation above: the correct choice (C) is the only one that fully meets every constraint stated in the question.
Option D does not satisfy the requirement in the scenario. Review the explanation above: the correct choice (C) is the only one that fully meets every constraint stated in the question.
Key idea: Agent Loop & Stop Reason
A tool-use stop indicates that the model is waiting for a tool result. The client must execute the authorized tool, return a correctly formed result block, and continue the loop. On the CCDV-F exam, questions in the "Agents and Workflows" domain test whether you can map a scenario's constraints to the right choice. Read the requirement carefully, eliminate options that violate any single constraint, and pick the one that satisfies all of them with the least operational overhead.
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