CLI session hangs after task completion (intermittent)

[BonoJovi]

Describe the bug

Tasks sometimes complete successfully but the CLI session hangs without returning control to the user. This makes it difficult to determine whether a task is still in progress or has already finished.

Observed behaviors:

• Sometimes tasks complete and return control normally
• Sometimes tasks complete successfully but the session hangs/freezes
• The user has to manually check if the work was actually completed

Example case:
When editing res/tests/TEST_DESIGN.md, the file was fully edited and complete (501 lines, properly structured from beginning to end), but the CLI session did not return control to the user. The task appeared to be "stuck" even though all work was done.

Affected version

0.0.350

Steps to reproduce the behavior

1. Start an interactive Copilot CLI session
2. Request a task that involves file editing or other operations
3. Wait for task completion
4. Observe that sometimes the CLI returns control, sometimes it doesn't despite the task being complete

Expected behavior

The CLI should consistently return control to the user after task completion, regardless of the task type or result.

Additional context

• Operating System: Linux
• The issue is intermittent - same types of tasks sometimes complete normally, sometimes hang
• When hanging occurs, the actual work is completed successfully
• This creates uncertainty about whether to wait longer or check manually

[EvanBoyle]

Definitely want to get this fixed! It would be really helpful if you could share a screenshot of the CLI when this repro'd, or even better steps for a consistent minimal repro along with debug logs (run the cli with --log-level debug and then find the logs in `~/.copilot/logs

[BonoJovi]

Regarding the debug logs and screenshots, understood. Since this issue simply involves a time-consuming process, it's unclear whether waiting will resolve it, and it's not reproducible. I'll report back if I can reproduce it again.

[colin-hallmark]

I've been experiencing this as well on MacOS, most recently today on version 0.0.351. I also noted that cancelling failed and was hung up as well. It's very intermittent, I think we'll have trouble giving regularly reproducible steps.

[BonoJovi]

The freeze occurred again just now. Checking the Copilot CLI debug logs, it appears the processing itself completed normally. However, I should note that the process does not return, and even when canceled, the cancellation process itself does not complete. Incidentally, no error is displayed on the screen; it just keeps showing “Thinking.” When canceled, it similarly keeps showing “Cancelling.”

session-3dbe9501-fa55-486d-be04-88ee52b2803f.log