define-tools changedagents-and-tools/tool-use/define-tools
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33url: https://platform.claude.com/docs/en/agents-and-tools/tool-use/define-tools
44description: Specify tool schemas, write effective descriptions, and control when Claude calls your tools.
55featureMetadata:
6 status: ga
6 status: stable
77 supportedModels:
88 - claude-fable-5-1
99 - claude-mythos-5-1
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2323 - claude-opus-4-5-20251101
2424 - claude-sonnet-4-5-20250929
2525 supportedPlatforms:
26 Claude API: ga
27 Claude Platform on AWS: ga
28 Claude Models on Google Cloud (Anthropic managed): ga
29 Amazon Bedrock: ga
30 Amazon Bedrock (InvokeModel): ga
31 Claude Models on Google Cloud (Google managed): ga
32 Microsoft Foundry: ga
26 Claude API: stable
27 Claude Platform on AWS: stable
28 Claude Models on Google Cloud (Anthropic managed): stable
29 Amazon Bedrock: stable
30 Amazon Bedrock (InvokeModel): stable
31 Claude Models on Google Cloud (Google managed): stable
32 Microsoft Foundry: stable
3333---
3434
3535**API support**: Usage differs by product.
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