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claude-code - 💡(How to fix) Fix ultraplan: cannot launch remote session despite GitHub app being installed

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Error Message

/ultraplan fails to launch a remote session with the error: This error persists even after the Claude GitHub app has been correctly installed on the repository. 6. Retried /ultraplan <prompt> — same error every time

Code Example

ultraplan: cannot launch remote session —
The Claude GitHub app must be installed on this repository first.
https://github.com/apps/claude/installations/new
RAW_BUFFERClick to expand / collapse

Reported by: Ashwin

Issue

/ultraplan fails to launch a remote session with the error:

ultraplan: cannot launch remote session —
The Claude GitHub app must be installed on this repository first.
https://github.com/apps/claude/installations/new

This error persists even after the Claude GitHub app has been correctly installed on the repository.

Steps taken

  1. Initialized a git repository locally
  2. Added a GitHub remote (git remote add origin https://github.com/ashwinksv/commoners.git)
  3. Committed and pushed files to the remote
  4. Installed the Claude GitHub app on the ashwinksv/commoners repository (via https://github.com/apps/claude/installations/new, selecting only the specific repository)
  5. Verified the app appears under the repository's installations settings
  6. Retried /ultraplan <prompt> — same error every time

Expected behaviour

Remote session should launch and return a browser link for web editing.

Actual behaviour

Fails with "Claude GitHub app must be installed" even though it is installed.

Environment

  • Platform: Windows 10
  • Shell: PowerShell

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#installation#inference speed#output truncation#response parsing#generation error

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claude-code - 💡(How to fix) Fix ultraplan: cannot launch remote session despite GitHub app being installed