tool-search-tool changedagents-and-tools/tool-use/tool-search-tool
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## Availability ### API support #### [Messages API](https://platform.claude.com/docs/en/build-with-claude/working-with-messages) #### [Managed Agents](https://platform.claude.com/docs/en/managed-agents/overview) ### Data handling
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22title: Tool search tool
33url: https://platform.claude.com/docs/en/agents-and-tools/tool-use/tool-search-tool
44description: Scale to hundreds or thousands of tools by letting Claude search your tool catalog and load only the tools it needs.
5featureMetadata:
6 status: ga
7 zdr:
8 eligibility: eligible
9 note: Excludes [Covered Models](https://platform.claude.com/docs/en/manage-claude/api-and-data-retention#model-specific-data-retention-requirements). Server-side tool run by Anthropic; the tool definitions in the request are searched in memory per call and nothing is stored after the response.
10 supportedModels:
11 - claude-fable-5-1
12 - claude-mythos-5-1
13 - claude-fable-5
14 - claude-mythos-5
15 - claude-mythos-preview
16 - claude-opus-5-5
17 - claude-opus-5
18 - claude-sonnet-5-5
19 - claude-sonnet-5
20 - claude-haiku-5-5
21 - claude-haiku-4-5-20251001
22 - claude-opus-4-8
23 - claude-opus-4-7
24 - claude-opus-4-6
25 - claude-sonnet-4-6
26 - claude-opus-4-5-20251101
27 - claude-sonnet-4-5-20250929
28 supportedPlatforms:
29 Claude API: ga
30 Claude Platform on AWS: ga
31 Amazon Bedrock: ga
32 Amazon Bedrock (InvokeModel):
33 availability: ga
34 note: On Amazon Bedrock it is not available through the Converse API.
35 Claude Models on Google Cloud (Google managed): ga
36 Microsoft Foundry: ga
537---
638
739The tool search tool lets Claude work with hundreds or thousands of tools by discovering and loading them on demand. Instead of loading all tool definitions into the context window up front, Claude searches your tool catalog (including tool names, descriptions, argument names, and argument descriptions) and loads only the tools it needs.
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2355 Share feedback on this feature through the [feedback form](https://forms.gle/MhcGFFwLxuwnWTkYA).
2456</Note>
2557
26<Note>
27 To learn how zero data retention (ZDR) applies to this feature, see [API and data retention](https://platform.claude.com/docs/en/manage-claude/api-and-data-retention).
28</Note>
29
3058<Warning>
3159 On Amazon Bedrock, server-side tool search is available only through the [InvokeModel API](https://docs.aws.amazon.com/bedrock/latest/userguide/bedrock-runtime_example_bedrock-runtime_InvokeModel_AnthropicClaude_section.html), not the Converse API.
3260</Warning>
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871899 Specify tool schemas, write effective descriptions, and control when Claude calls your tools.
872900 </Card>
873901</CardGroup>
902
903## Availability
904
905Tool search tool is available on every model and eligible for zero data retention.
906
907### API support
908
909#### [Messages API](https://platform.claude.com/docs/en/build-with-claude/working-with-messages)
910
911* Availability: Available
912
913| Status | Cloud platforms | Models |
914| --------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------- |
915| Available | Claude API, [Claude Platform on AWS](https://platform.claude.com/docs/en/build-with-claude/claude-platform-on-aws), [Amazon Bedrock](https://platform.claude.com/docs/en/build-with-claude/claude-in-amazon-bedrock), [Claude Models on Google Cloud (Google managed)](https://platform.claude.com/docs/en/build-with-claude/claude-models-on-google-cloud/google-managed), [Microsoft Foundry](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry) | [All models](https://platform.claude.com/docs/en/models/overview) |
916| Available<sup>1</sup> | [Amazon Bedrock (InvokeModel)](https://platform.claude.com/docs/en/build-with-claude/claude-on-amazon-bedrock-legacy) | [All models](https://platform.claude.com/docs/en/models/overview) |
917
9181. On Amazon Bedrock it is not available through the Converse API.
919
920#### [Managed Agents](https://platform.claude.com/docs/en/managed-agents/overview)
921
922* Availability: Not available
923
924### Data handling
925
926[Data handling overview](https://platform.claude.com/docs/en/manage-claude/api-and-data-retention#feature-eligibility)
927
928| Item | Zero data retention | HIPAA |
929| ------- | --------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------ |
930| Status | Eligible (excludes [Covered Models](https://platform.claude.com/docs/en/manage-claude/api-and-data-retention#model-specific-data-retention-requirements)) | Not eligible |
931| Details | Server-side tool run by Anthropic; the tool definitions in the request are searched in memory per call and nothing is stored after the response. | — |
932
933Applicable endpoints:
934
935* `/v1/messages` with `tool_search` tool
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