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Tool use with the Messages API

Tool use with the Messages API

Course quiz

Quiz10 min

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Previous lessonCut the cost of tool-heavy workflows Next lessonStart fixing your own tools

Reliable calls

Creating tools that Claude picks
Strict tool use: Stop rejecting your own calls

Parallel and streamed tool calls

Parallel tool calling: Cut the latency
Streaming tool calls: No more frozen spinners

Tools Anthropic provides

Code execution: Claude runs the code it writes
Web search: Answers from the sites you trust
Computer use: Automate desktop software with no API

Costs of tool-heavy requests

Cut the cost of tool-heavy workflows

Quiz and next steps

Course quizQuiz
Start fixing your own tools

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