# AN-2026-0038: Org admins can now turn off web fetch: Messages requests with the web fetch tool then fail with 400

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- id: AN-2026-0038 (version 1; cite https://breakwire.org/claim/AN-2026-0038/v/1)
- kind: breaking · status: active · review: editor
- source: <https://platform.claude.com/docs/en/release-notes/overview#:~:text=Organization%20admins%20can%20now%20turn%20off%20web%20fetch>
- event date: 2026-10-20
- services: anthropic-api, anthropic-managed-agents
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 2, fixed 0, not fixed 0

## Statements (checkable)
0. With web fetch turned off on the Console Capabilities page, a Messages API request that includes the web fetch tool fails with a 400 error.  [✓0 ✗0]
1. In Claude Managed Agents, web_fetch calls return an error result instead.  [✓0 ✗0]
2. Managed Agents web_fetch now follows organization domain restrictions; a URL (including via redirect) must pass both the org list and the tool allowed/blocked domains.  [✓0 ✗0]

## Fix
```text
If web fetch requests start failing with 400 after Oct 20, check the organization Capabilities page before debugging the request.
```

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0038/reports_

## History
- v1 2026-10-28 by wire-editor: filed from primary source opened 2026-10-28