claude-code - 💡(How to fix) Fix Cowork panel auto-opens every session and shows broken preview for local MCP extension file [1 participants]

Official PRs (…)
ON THIS PAGE

Recommended Tools

×6

Utilities matched from this issue’s tags and category — try them while you read without losing context.

GitHub issue graph ai analysis

Paste a GitHub issue URL. We fetch that issue, discover linked issues from bodies/comments/timeline, collect linked pull requests, and produce a structured English report.

The report is written in English Markdown for sharing and archival.

Helpful · Quick feedback

Loading…
GitHub stats
anthropics/claude-code#54110Fetched 2026-04-28 06:38:59
View on GitHub
Comments
0
Participants
1
Timeline
4
Reactions
0
Timeline (top)
labeled ×4

Every time Claude Code Desktop is opened, the Cowork panel activates automatically and shows a broken file preview dialog.

Root Cause

Every time Claude Code Desktop is opened, the Cowork panel activates automatically and shows a broken file preview dialog.

RAW_BUFFERClick to expand / collapse

Description

Every time Claude Code Desktop is opened, the Cowork panel activates automatically and shows a broken file preview dialog.

Steps to reproduce

  1. Have the Kapture MCP extension installed in Claude Code Desktop (ant.dir.gh.williamkapke.kapture)
  2. Open Claude Code Desktop (any project)
  3. The Cowork panel opens automatically

Expected behavior

Cowork panel should not auto-open on every session unless explicitly triggered by the user.

Actual behavior

  • The Cowork panel opens showing "Vamos a completar algo de tu lista" (onboarding/checklist UI)
  • A dialog appears saying "La vista previa no está disponible para C:\Users\...\Claude Extensions\ant.dir.gh.williamkapke.kapture\dist\index.js" with a "Descargar" (Download) button
  • This happens on every single Claude Code session open

Environment

  • OS: Windows 10 Pro 10.0.19045
  • Claude Code: Desktop app
  • MCP extension installed: ant.dir.gh.williamkapke.kapture (Kapture browser automation)

Additional context

No user-configured hooks, scheduled tasks, or settings are triggering this — it appears to be behavior of the Claude Code Desktop app itself opening the Cowork panel on startup when the Kapture extension is installed.

The preview dialog for index.js (a compiled Node.js file) suggests the Cowork panel is trying to render a file that cannot be previewed in the UI.

extent analysis

TL;DR

Disable or uninstall the Kapture MCP extension to prevent the Cowork panel from auto-opening on Claude Code Desktop startup.

Guidance

  • Verify that the issue is specific to the Kapture extension by testing Claude Code Desktop without it installed.
  • Check if there are any extension settings or configurations that could be causing the Cowork panel to open automatically.
  • Consider reporting this issue to the Kapture extension developer, as it may be a bug or incompatibility with Claude Code Desktop.
  • If the issue persists, try resetting Claude Code Desktop settings to their default values to rule out any user-configured settings causing the problem.

Example

No code snippet is provided as the issue seems to be related to the interaction between the Kapture extension and Claude Code Desktop, rather than a specific code problem.

Notes

This solution assumes that the Kapture extension is the cause of the issue, based on the provided information. If disabling or uninstalling the extension does not resolve the problem, further investigation into Claude Code Desktop settings or other installed extensions may be necessary.

Recommendation

Apply workaround: Disable or uninstall the Kapture extension, as it is likely causing the unwanted behavior and there is no clear indication of a fix available.

Vote matrix · Quick signals

Works
Did the solution work? Tap to confirm.
Easy Fix
Was it a quick fix?
Time Saver
Did it save you time?
Blocking
Was it severely blocking?
Common Issue
Are others likely hitting this too?
Flaky / Intermittent
Is it intermittent?
Verified / Reproducible
Can you reproduce it reliably?
Loading…

FAQ

Expected behavior

Cowork panel should not auto-open on every session unless explicitly triggered by the user.

Still need to ship something?

×6

Another batch ranked right after the header list — different links, same matching logic.

Back to top recommendations

TRENDING

claude-code - 💡(How to fix) Fix Cowork panel auto-opens every session and shows broken preview for local MCP extension file [1 participants]