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Copilot CLI session stops producing output (no response text after prompt) #2672

@tarikbrown-msft

Description

@tarikbrown-msft

Describe the bug

Image

My Copilot CLI session no longer outputs any text after I submit prompts. The UI accepts input, but the response area remains blank and no completion is displayed, effectively making the session unusable.

Affected version

Copilot CLI version: 1.0.19 (from copilot --version)

Steps to reproduce the behavior

I don't have exact step to reproduce as this seems like a random error but I was having copilot make consecutive az cli calls while having a background thread running. I think this is a performance issue that could be replicated through a stress test. If not, then this can be disregarded as a rare event.

I was also using the terminal window in VS Code

Expected behavior

Copilot should return normal response text for each prompt (a completion/answer should be printed to the terminal) and continue working across multiple prompts in the same session.

Additional context

Environment:
OS: Windows (using WSL)
WSL distro: Ubuntu (WSL 2)
Terminal: Windows Terminal
Shell: PowerShell Core 7.6.0
Copilot CLI version: 1.0.19
Screenshot attached (Image 1) showing the session state where prompts are accepted but no output is produced.

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