Sub-agents UI flickers while running

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1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

While a sub-agent (Task tool / subagent) is running, the sub-agent UI flickers continuously. The visual flashing makes it hard to follow progress and is distracting while waiting for the sub-agent to finish.

Steps to Reproduce

  1. Open Cursor Agent chat.
  2. Start a task that launches one or more sub-agents (Task tool).
  3. While the sub-agent is running, observe the sub-agent UI/card/panel.
  4. Notice continuous flickering for the duration of the run (see attached video).

Expected Behavior

Sub-agent UI should remain visually stable while the sub-agent is running — status and progress updates without flickering/flashing.

Operating System

MacOS

Version Information

Version: 3.14.2
Commit: 6f34e8e5e83462b04898c58addcaa960127fa720
OS: Darwin arm64 25.6.0 (macOS 26.6)

For AI issues: add Request ID with privacy disabled

Happens while sub-agents are actively running.

Does this stop you from using Cursor

No - Cursor works, but with this issue

7

Thanks for the detailed report, and for including the recording. That made it much easier to see exactly what’s happening.

Going through your video frame by frame, the status line on the sub-agent card alternates between “Stopped” and “Planning next moves” roughly once a second while the sub-agent is still working. That isn’t intended behavior, and it isn’t caused by anything in your setup.

Worth knowing in the meantime: the sub-agent really is still running through those “Stopped” frames. The spinner keeps moving, and the parent agent still shows “Waiting for subagent”, so the status text is the only thing that’s off. Your work isn’t being interrupted while this happens.

We’ve let the team know. No timeline to share yet, but I’ll post here when there’s an update.