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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: Agent Skills
33url: https://platform.claude.com/docs/en/agents-and-tools/agent-skills/overview
44description: Agent Skills are modular capabilities that extend Claude's functionality. Each Skill packages instructions, metadata, and optional resources (scripts, templates) that Claude uses automatically when relevant.
5featureMetadata:
6 status: ga
7 zdr:
8 eligibility: not-eligible
9 note: Skill data retained according to standard policy.
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 Claude Models on Google Cloud (Anthropic managed): ga
32 Microsoft Foundry (hosted on Anthropic):
33 availability: ga
34 note: Hosted on Anthropic deployments only; the skill version download endpoint (`GET /v1/skills/{skill_id}/versions/{version}/content`) is not supported on Foundry.
535---
636
7<Note>
8 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).
9</Note>
37**API support**: Usage differs by product.
1038
39* **Messages API**: List `skill_ids` in the `container` parameter and include the code execution tool, whose container the skills run in.
40* **Managed Agents**: Attach skills in the agent’s `skills` array, or load them from a GitHub repository mounted on the session.
41
1142## Why use Skills
1243
1344Skills are reusable, filesystem-based resources that give Claude domain-specific expertise: workflows, context, and best practices that turn a general-purpose agent into a specialist. Unlike prompts (conversation-level instructions for one-off tasks), Skills load on demand, so you don’t have to repeat the same guidance across conversations.
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270301Agent Skills is not covered by ZDR arrangements. Skill definitions and execution data are retained according to Anthropic’s standard data retention policy.
271302
272For ZDR eligibility across all features, see [API and data retention](https://platform.claude.com/docs/en/manage-claude/api-and-data-retention).
273
274303For audit logging of Skills API operations, see [Audit logging](https://platform.claude.com/docs/en/build-with-claude/skills-guide#audit-logging) in Using Agent Skills with the API.
275304
276305## Limitations and constraints
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336365 Learn how to write effective Skills that Claude can discover and use successfully.
337366 </Card>
338367</CardGroup>
368
369## Availability
370
371Agent Skills are available on every model.
372
373### API support
374
375#### [Messages API](https://platform.claude.com/docs/en/build-with-claude/working-with-messages)
376
377* Availability: Available
378* Usage: List `skill_ids` in the `container` parameter and include the code execution tool, whose container the skills run in.
379
380| Status | Cloud platforms |
381| --------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
382| Available | Claude API, [Claude Platform on AWS](https://platform.claude.com/docs/en/build-with-claude/claude-platform-on-aws), [Claude Models on Google Cloud (Anthropic managed)](https://platform.claude.com/docs/en/build-with-claude/claude-models-on-google-cloud/anthropic-managed) |
383| Available<sup>1</sup> | [Microsoft Foundry (hosted on Anthropic)](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry) |
384
3851. Hosted on Anthropic deployments only; the skill version download endpoint (`GET /v1/skills/{skill_id}/versions/{version}/content`) is not supported on Foundry.
386
387#### [Managed Agents](https://platform.claude.com/docs/en/managed-agents/overview)
388
389* Availability: Available
390* Usage: Attach skills in the agent’s `skills` array, or load them from a GitHub repository mounted on the session.
391
392| Status | Cloud platforms |
393| --------- | ----------------------- |
394| Available | All supported platforms |
395
396### Data handling
397
398[Data handling overview](https://platform.claude.com/docs/en/manage-claude/api-and-data-retention#feature-eligibility)
399
400| Item | Zero data retention | HIPAA |
401| ------- | --------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------ |
402| Status | Not eligible | Not eligible |
403| Details | Skill data retained according to standard policy. [Learn more](https://platform.claude.com/docs/en/agents-and-tools/agent-skills/overview#data-retention) | — |
404
405Applicable endpoints:
406
407* `/v1/skills`
408* `/v1/messages` with `skills`
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