tools-web-restrictions changedmanaged-agents/tools-web-restrictions
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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) ### Required beta headers
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66 topic:
77 title: Managed Agents
88 url: https://platform.claude.com/docs/en/managed-agents/overview
9 status: beta
109 betaHeader: managed-agents-2026-04-01
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: beta
31 Claude Models on Google Cloud (Anthropic managed): beta
1132---
1233
34**API support**: Usage differs by product.
35
36* **Messages API**: Set `allowed_domains` or `blocked_domains` on the `web_search` or `web_fetch` tool in the request.
37* **Managed Agents**: Set the same fields on the agent toolset; each list holds at most 64 domains.
38
1339To control which sites the agent’s web tools can reach, set a domain list on the `web_search` and `web_fetch` entries of the [agent toolset](https://platform.claude.com/docs/en/managed-agents/tools#configuring-the-toolset). Each of these `configs` (csharp, go: `Configs`) entries takes one of two lists:
1440
1541* **`allowed_domains` (java, php: `allowedDomains`; csharp, go: `AllowedDomains`):** The tool can reach only these hosts.
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518544 Coordinate multiple agents within a single session.
519545 </Card>
520546</CardGroup>
547
548## Availability
549
550Web domain restrictions are available or in beta, depending on the API.
551
552### API support
553
554#### [Messages API](https://platform.claude.com/docs/en/build-with-claude/working-with-messages)
555
556* Availability: Available
557* Usage: Set `allowed_domains` or `blocked_domains` on the `web_search` or `web_fetch` tool in the request.
558
559| Status | Cloud platforms |
560| --------- | --------------- |
561| Available | Claude API |
562
563#### [Managed Agents](https://platform.claude.com/docs/en/managed-agents/overview)
564
565* Availability: Available
566* Usage: Set the same fields on the `web_search` and `web_fetch` entries of the agent toolset. Unlike the Messages API, each list holds at most 64 ASCII domains, and `web_fetch` domains cannot include a path.
567
568| Status | Cloud platforms | Models |
569| ------ | ----------------------- | ----------------------------------------------------------------- |
570| Beta | All supported platforms | [All models](https://platform.claude.com/docs/en/models/overview) |
571
572### Required beta headers
573
574[Beta headers overview](https://platform.claude.com/docs/en/api/beta-headers)
575
576Beta headers allow you to access experimental features and new model capabilities before they become part of the standard API.
577
578| Header | APIs |
579| --------------------------- | ----------------------------------------------------------------------------- |
580| `managed-agents-2026-04-01` | [Managed Agents](https://platform.claude.com/docs/en/managed-agents/overview) |
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