Subagent callouts stuck in "New subagent - Starting up" in perpetuity

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

In the past few versions (starting a week or two ago), when agent/plan chat decides on its own to use subagents for investigations, the callouts stay in “New subagent Starting up” forever. Even after they have obviously returned results (and “Starting up” still has that pulsating text effect as well).

And with this, no way to click into them to view progress/results of subagent investigation, or even the topic of each one.

Steps to Reproduce

Do that will trigger an organic submodule investigation (I dont ask for it, Cursor just decides to do it).

Expected Behavior

Subagent modules update to show the title, allow me to click on them to open new tab with progress/results of investigation, and stop “pulsating” when done, show status, etc.

Screenshots / Screen Recordings

Operating System

MacOS

Version Information

Version: 3.1.17
VSCode Version: 1.105.1
Commit: fce1e9ab7844f9ea35793da01e634aa7e50bce90
Date: 2026-04-19T19:33:58.189Z
Layout: editor
Build Type: Stable
Release Track: Default
Electron: 39.8.1
Chromium: 142.0.7444.265
Node.js: 22.22.1
V8: 14.2.231.22-electron.0
OS: Darwin arm64 25.4.0

But like I said, has been like this for the bast few maintenance releases.

For AI issues: which model did you use?

Opus 4.6 thinking

Does this stop you from using Cursor

No - Cursor works, but with this issue

3 posts were merged into an existing topic: Sub Agents wont run and are stuck at “New Subagent - Starting up”