[Bug] Preview dropdown missing from session toolbar in Claude Desktop

Resolved 💬 2 comments Opened Mar 24, 2026 by neryangel Closed Apr 23, 2026

Bug Description
Preview dropdown not appearing in session toolbar in Claude Desktop app. Desktop v1.1.8359, CLI v2.1.81, embedded binary v2.1.78. Settings → Preview is ON. launch.json exists. Dev server starts but no Preview dropdown or embedded browser appears. macOS, Max plan.

Environment Info

  • Platform: darwin
  • Terminal: Apple_Terminal
  • Version: 2.1.81
  • Feedback ID: f56c2040-7c50-4463-bbfc-ba8fa155dae5

Also seeing "SessionStart:startup hook error" on CLI startup.
Duplicate of or related to #37557, #37491, #36485.

Errors

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