CCDV-F Tools and MCP Integration Practice Question
A developer is using the 'forced tool use' feature. What will be the value of the 'stop_reason' field in the API response when Claude generates the tool call?
⚠ Common exam trap
Candidates often confuse 'tool_use' with 'stop' or 'end_turn', failing to realize that the API specifically signals a tool invocation request as its own distinct stop reason during the generation process.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
tool_use
The 'stop_reason' field indicates why the model stopped generating text. When the model is forced to use a tool, or when it naturally decides to use one, it stops its current generation turn to allow the client to execute the tool. The value 'tool_use' is the specific indicator for this state.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
end_turn
Why it's wrong here
The 'end_turn' stop reason occurs when the model has finished its entire response and has nothing more to say. In the case of tool use, the model's turn is not actually finished; it is pausing to wait for the results of the tool execution before it can provide the final output.
- ✗
max_tokens
Why it's wrong here
The 'max_tokens' stop reason indicates that the model reached the token limit specified in the request before it could finish its generation. This is an abrupt stop and is unrelated to whether the model was attempting to use a tool or just generating standard text for the user.
- ✓
tool_use
Why this is correct
When Claude generates a tool_use block, it signals this by setting the 'stop_reason' to 'tool_use'. This is the programmatic trigger for the client application to parse the response, find the tool call, execute the corresponding logic, and then send the result back to the model for further processing.
- ✗
stop_sequence
Why it's wrong here
The 'stop_sequence' reason is triggered when the model generates a specific string that the developer has defined as a termination signal. While useful for controlling output format, it is not the mechanism used by the Anthropic API to signal that a tool call has been generated and needs execution.
About these practice questions
This CCDV-F question is part of Courseiva's 257-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Anthropic exam blueprint
This CCDV-F practice question is part of Courseiva's free Anthropic certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CCDV-F exam.