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claude-code - 💡(How to fix) Fix [BUG] 1.3036.0 (cf521c): Cowork sessions crash with "exited with code 1" — Claude Code and chat unaffected [4 comments, 5 participants]

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anthropics/claude-code#49382•Fetched 2026-04-17 08:42:44
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Error Message

Error Messages/Logs

Also confirmed by opening an unrelated existing Cowork session from prior to the update — same error.

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Preflight Checklist

  • I have searched existing issues and this hasn't been reported yet
  • This is a single bug report (please file separate reports for different bugs)
  • I am using the latest version of Claude Code

What's Wrong?

After updating to Claude 1.3036.0 (cf521c), build date 2026-04-16T16:17:33.000Z, all Cowork sessions fail immediately with "Claude Code process exited with code 1." Scope of the failure (cleanly isolated):

Cowork sessions: broken (both new sessions and existing sessions) Chat (claude.ai / Desktop chat mode): works Claude Code (standalone, outside Cowork): works

Only the Cowork VM layer is affected.

What Should Happen?

claude coward sessions should work

Error Messages/Logs

Steps to Reproduce

Reproduction:

Launch Claude Desktop on 1.3036.0 (cf521c) Start a new Cowork session (any prompt, any working directory) Session immediately fails with "Claude Code process exited with code 1"

Also confirmed by opening an unrelated existing Cowork session from prior to the update — same error.

What I tried:

Fully quit and relaunched the app Started a brand-new Cowork session on a fresh folder (still fails) Verified chat and Claude Code both work on the same machine

Version: Claude 1.3036.0 (cf521c) 2026-04-16T16:17:33.000Z OS: [fill in — macOS version, or Windows 10/11] Date first observed: 2026-04-16, immediately after auto-update Possibly related: #46029 (1.1617.0 Cowork regression, same failure mode)

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

No response

Claude Code Version

Claude 1.3036.0 (cf521c) 2026-04-16T16:17:33.000Z

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

No response

extent analysis

TL;DR

The issue can likely be resolved by investigating the compatibility of the Cowork VM layer with the updated Claude Code version 1.3036.0.

Guidance

  • Verify that the issue is specific to the Cowork VM layer by testing other features of Claude Code, such as chat and standalone mode, which are reported to be working.
  • Check the release notes for version 1.3036.0 to see if there are any known issues or changes that could be affecting the Cowork VM layer.
  • Consider rolling back to a previous version of Claude Code to see if the issue is resolved, as the problem is reported to be a regression.
  • Investigate the possibly related issue #46029, which mentions a similar failure mode in a previous version.

Example

No code snippet is provided as the issue does not contain any specific code-related information.

Notes

The issue lacks specific error messages or logs, which could provide more insight into the problem. Additionally, the last working version of Claude Code is not specified, which could be helpful in identifying the cause of the regression.

Recommendation

Apply workaround: Roll back to a previous version of Claude Code until the issue is resolved, as the problem is reported to be a regression and other features are working correctly.

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