Question

Your application defined three independent tools and, in a single turn, Claude returned a stop_reason of 'tool_use' with three separate tool_use blocks (each with a unique tool_use_id). Your backend executes all three in parallel and gets all results back. How should you structure the next message you send back to Claude?

Accepted Answer

Send a single user message containing all three tool_result blocks, each referencing its matching tool_use_id.

Answer

Send three separate user messages, each containing one tool_result block, in the order the tools finished executing.

Answer

Send a single assistant message containing the three tool_result blocks so Claude can continue its own turn.

Answer

Send only the tool_result for the first tool_use_id and let Claude request the remaining results one at a time.