fix(ai-anthropic): send the anthropic-beta header that computerUseTool needs by AlemTuzlak · Pull Request #1832 · TanStack/ai

AlemTuzlak · 2026-10-19T17:08:06Z

computerUseTool() from @tanstack/ai-anthropic/tools sends no computer use beta header, and Anthropic needs one for each of these versions. This PR adds the header that each version needs: computer-use-2025-01-24 for computer_20250124, and computer-use-2024-10-22 for computer_20241022.

🎯 Changes

computeAnthropicBetas adds the computer use beta of the computer tool in tools. It follows the code_execution code next to it.
A unit test that is the repro, and an E2E wire spec that reads the anthropic-beta header of the outgoing request.
A patch changeset.

Docs: no change. The docs never said which header the tool sends, and the samples now work as written.

✅ Checklist

I have followed the steps in the Contributing guide.
I have tested code changes locally with pnpm run test:pr, or these tests do not apply to this pull request.
I fully understand the code in this pull request, including any code generated with AI assistance.
Docs: I updated docs/ for this change, or this change is not user-facing.
Changeset: I added a changeset (pnpm changeset), or this PR does not change a published package.

🚀 Release Impact

This change affects published code, and I have generated a changeset.
This change is docs/CI/dev-only (no release).

Root cause

Issue. A chat() request with computerUseTool() has no computer use beta header. The Anthropic docs say that each earlier version needs its beta header on every request. For example, computer_20250124 needs computer-use-2025-01-24.
Cause. The adapter sends betas from computeAnthropicBetas (packages/ai-anthropic/src/adapters/text.ts). That function adds the betas of code execution, skills, files, MCP, context management, and mid-conversation tools, but none for a computer use tool.
Fix. When tools has a computer use tool, computeAnthropicBetas reads its type and adds the matching beta.

Possible alternatives

Users set the header with defaultHeaders. This works today. It makes every app find and keep the right header for each version, and the adapter already owns the betas of the other tools.
Always send computer-use-2025-01-24. Two lines shorter. It sends the wrong header for computer_20241022, which computerUseTool() also takes.

Testing

Commands run:

The repro (packages/ai-anthropic/tests/computer-use-beta.test.ts, written for this PR) on a clean main worktree at 7095ebbf1. It fails:

 RUN  v4.1.10 F:/worktrees/ai/anthropic-computer-use/worktrees/bugfix-0139ca8189eb-main/packages/ai-anthropic
     × sends computer_20250124 with the computer-use-2025-01-24 beta 25ms
     × sends computer_20241022 with the computer-use-2024-10-22 beta 2ms
⎯⎯⎯⎯⎯⎯⎯ Failed Tests 2 ⎯⎯⎯⎯⎯⎯⎯
AssertionError: expected [] to include 'computer-use-2025-01-24'
AssertionError: expected [] to include 'computer-use-2024-10-22'
 Test Files  1 failed (1)
      Tests  2 failed (2)

The same command on this branch (08a7b2a75). It passes:

 RUN  v4.1.10 F:/worktrees/ai/anthropic-computer-use/worktrees/bugfix-d3ec72c1e6b8-pr/packages/ai-anthropic
 Test Files  1 passed (1)
      Tests  2 passed (2)
   Start at  18:48:06
   Duration  1.78s (transform 1.02s, setup 0ms, import 1.34s, tests 23ms, environment 0ms)

Vitest with --maxWorkers=2 on computer-use-beta, text.skills, provider-tools-smoke, and tools-per-model-type-safety: 48 tests pass.
test:types, test:oxlint (no new warnings), and oxfmt --check on ai-anthropic and the changed files.
The E2E route type-checks with the TypeScript of testing/e2e.

Not run locally: the E2E suite, pnpm test:pr, and coverage. CI runs them.

Manual test:

On main, run pnpm --dir packages/ai-anthropic exec vitest run tests/computer-use-beta.test.ts. Both tests fail: expected [] to include 'computer-use-2025-01-24'.
On this branch, run the same command. Both tests pass.
With a real key, send a chat() on claude-haiku-4-5 with computerUseTool({ type: 'computer_20250124', name: 'computer', display_width_px: 1024, display_height_px: 768 }). The request now has anthropic-beta: computer-use-2025-01-24.

How this PR makes testing easy: tests/computer-use-beta.test.ts runs chat() with a mocked client and reads the betas of the request. testing/e2e/tests/anthropic-computer-use-wire.spec.ts reads the real anthropic-beta header from a custom fetch.

Risk / rollback

Low. A request with a computer use tool gets one more beta header. Other requests do not change. To undo, revert this PR.

Summary by CodeRabbit

New Features
- Computer-use requests now send the Anthropic beta header for the matching computer-use version, supporting both the 2024 and 2025 formats.
Tests
- Added coverage verifying the beta header is sent for both versions, including an end-to-end check.

computerUseTool() went out without its anthropic-beta header, so Anthropic rejected the request. Add computer-use-2025-01-24 for computer_20250124 and computer-use-2024-10-22 for computer_20241022.

changeset-bot · 2026-10-19T17:08:11Z

🦋 Changeset detected

Latest commit: 08a7b2a

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@tanstack/ai-anthropic	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

nx-cloud · 2026-10-19T17:09:49Z

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github-actions · 2026-10-19T17:10:02Z

Coverage

✅ Coverage held across 2 compared package(s).

Each package is measured twice in this job — on this PR and on its merge-base with main — and compared. A metric fails only when it is at or above 60% on the merge-base and under 60% on this PR. Other drops are listed but do not fail. Packages your PR doesn't affect are not measured and not listed.

package	statements	branches	functions	lines
ai-anthropic	92.04% (+0.04)	86.80% (+0.07)	95.61% (+0.04)	92.45% (+0.04)	ok
ai-code-mode-snippets	87.13% (0.00)	75.67% (0.00)	91.11% (0.00)	88.39% (0.00)	ok

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commit: 08a7b2a

coderabbitai · 2026-10-19T17:23:39Z

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📒 Files selected for processing: 6

.changeset/anthropic-computer-use-beta.md
packages/ai-anthropic/src/adapters/text.ts
packages/ai-anthropic/tests/computer-use-beta.test.ts
testing/e2e/src/routeTree.gen.ts
testing/e2e/src/routes/api.anthropic-computer-use-wire.ts
testing/e2e/tests/anthropic-computer-use-wire.spec.ts

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📝 Walkthrough

The Anthropic adapter now selects a dated anthropic-beta header for computer-use tools based on tool version. Unit tests check both supported versions. An end-to-end route captures the outgoing header and returns it for verification.

Changes: Computer-use beta selection

Layer / File(s)	Summary
Select the beta by tool version `packages/ai-anthropic/src/adapters/text.ts`, `packages/ai-anthropic/tests/computer-use-beta.test.ts`, `.changeset/anthropic-computer-use-beta.md`	`computeAnthropicBetas` adds `computer-use-2024-10-22` for `computer_20241022` and `computer-use-2025-01-24` for other converted computer-use types. Unit tests check both values. A patch changeset describes the versioned headers.

End-to-end header verification

Layer / File(s)	Summary
Capture and verify the outgoing header `testing/e2e/src/routes/api.anthropic-computer-use-wire.ts`, `testing/e2e/src/routeTree.gen.ts`, `testing/e2e/tests/anthropic-computer-use-wire.spec.ts`	The POST route runs a chat with `computerUseTool` and captures the outgoing `anthropic-beta` header. The generated route tree registers the endpoint. The end-to-end test checks for `computer-use-2025-01-24`.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

Merge Risk: ⚪ Minimal · up to 08a7b

The change is mergeable after normal checks; no concrete issue requiring a fix before merge was established.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 5 files. (1 skipped: 1…	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Title check		The title clearly and concisely identifies the main change: sending the required Anthropic beta header for computerUseTool.
Description check		The description follows the required template, explains the change and root cause, documents testing and risk, and confirms the changeset. It also states which tests were not run locally and why.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 5 files. (1 skipped: 1 unsupported.)

Resolution

Write docstrings for the functions missing them to satisfy the coverage threshold.

Fix all pre-merge checks with AI

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AlemTuzlak · 2026-10-20T12:01:25Z

Closing this PR. Its commits are now part of #1837. That PR also adds @tanstack/ai-computer-use, with drivers for Playwright and E2B. Review #1837 instead.

AlemTuzlak added 2 commits October 19, 2026 18:12

fix(ai-anthropic): send the computer use beta header

0f31597

computerUseTool() went out without its anthropic-beta header, so Anthropic rejected the request. Add computer-use-2025-01-24 for computer_20250124 and computer-use-2024-10-22 for computer_20241022.

test(e2e): check the computer use beta header on the wire

08a7b2a

AlemTuzlak mentioned this pull request Oct 19, 2026

feat(ai-anthropic): computer use on the Claude 5.5 models, with the computer toolset, computer_20251124, and SDK 0.135 #1834

Closed

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github-actions Bot assigned jherr Oct 20, 2026

github-actions Bot requested a review from jherr October 20, 2026 00:23

github-actions Bot added the waiting-on: maintainer The ball is in the maintainers’ court label Oct 20, 2026

AlemTuzlak mentioned this pull request Oct 20, 2026

feat(ai-computer-use, ai-computer-playwright, ai-computer-sandbox, ai-computer-local): computer use on OpenAI and Anthropic, with Playwright, sandbox, and local drivers #1837

Merged

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AlemTuzlak closed this Oct 20, 2026

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fix(ai-anthropic): send the anthropic-beta header that computerUseTool needs - #1832

fix(ai-anthropic): send the anthropic-beta header that computerUseTool needs#1832
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