Anthropic documents tool use on the Messages API so Claude can request structured tool invocations that the client executes and returns, forming the integration contract between Claude and external systems.
AI Integration Intelligence
Anthropic Tool Use (Messages API)
Anthropic · agent-tools
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Editorial overview
How it works
- Client declares tools with JSON schemas
- Claude may return tool_use blocks
- Client runs tools and returns tool_result content
Limitations
- Tool execution is client-side; Claude does not call arbitrary internet APIs by itself unless the client implements that
- Feature flags and model support vary—verify current docs
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Why it matters
Anthropic Tool Use (Messages API) is tracked so teams can evaluate how AI surfaces connect to apps, data, and workflows using official documentation—not marketing claims.
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