Question

You send a request to the Messages API that includes a tool definition for get_weather. Claude's response comes back with a stop_reason of "tool_use" and a content block containing a tool_use block with an id and the input arguments. What is the correct next step for your application to continue the conversation?

Accepted Answer

Append a new user message containing a tool_result content block that references the tool_use id and holds the output of running get_weather, then call the API again.

Answer

Re-send the exact same request unchanged so Claude can generate the final answer on its own.

Answer

Append an assistant message with the tool output so Claude sees the result in its own voice.

Answer

Immediately return the raw tool_use block to the end user as the final response.