Parallel Tool Use

Tools

Definition

Claude's ability to request multiple tool calls in a single response by returning multiple tool_use blocks. All requested tools can be executed concurrently, then all tool_result blocks are returned together. Significantly reduces the number of API round-trips for independent operations.

Example Usage

Claude requests weather, news, and calendar data simultaneously in one response; execute all three in parallel and return results together.

Related Concepts

Tool Use Flow & Mechanics

Agentic Architecture

Tool use follows a define -> select -> execute -> return cycle

Tool Distribution & Least Privilege

Tool Design & MCP

Each agent should have only the tools needed for its specific role (4-5 tools, not 18)

Related Terms

tool_use Agentic Loop

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