Instability with Agents this morning

Support Bug Reports
,
1

Where does the bug appear (feature/product)?

  • Cursor IDE

Describe the Bug
I loaded up Cursor today and tried to kick off a couple agents, got stuck in “Planning mode”.

Reloaded the window, the agents started to work fine.

But now I’m hitting an issue with Composer now not resuming:

Request ID: 7032b07b-0f72-4a00-817c-36d18ce65623
{"error":"ERROR_EXTENSION_HOST_TIMEOUT","details":{"title":"Agent Stream Start Failed","detail":"The agent stream failed to start. Please reload the window to continue.","isRetryable":false,"shouldShowImmediateError":true,"additionalInfo":{},"buttons":[{"label":"Reload Window","reloadWindow":{}}],"planChoices":[]}}
Agent Stream Start Failed [deadline_exceeded]
ConnectError: [deadline_exceeded] Agent Stream Start Failed
    at vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:43352:43092

I just reloaded the window before hitting this error. Surely this isn’t the actual fix. Are you having some instability on cursor’s side or your provider’s side?

Note that I was able to punch through with one request, but now hitting this issue again.

Steps to Reproduce
How can you reproduce this bug? We have a much better chance at fixing issues if we can reproduce them!

  1. Reload cursor
  2. Make a request to composer (old chat with ~50% context window)
  3. Pray that your request gets past the issue.

Expected Behavior
Send off a request and get back results.

Screenshots / Screen Recordings
n/a

Operating System

  • MacOS

Version Information

  • For Cursor IDE: Menu → About Cursor → Copy
  • For Cursor CLI: Run agent about in your terminal
IDE:
Version: 2.xx.x
VSCode Version: 1.105.1
Commit: ......

CLI:
CLI Version 2026.01.17-d239e66

For AI issues: which model did you use?
Model name (e.g., Sonnet 4, Tab…)

For AI issues: add Request ID with privacy disabled
Request ID: f9a7046a-279b-47e5-ab48-6e8dc12daba1
For Background Agent issues, also post the ID: bc-…

Additional Information
I’m processing large files, it’s possible that somehow cursor is just imploding from this. Also noticed that I couldn’t access the file system from cursor

Does this stop you from using Cursor?

  • Sometimes - I can sometimes use Cursor
2

Hi there!

We detected that this may be a bug report, so we’ve moved your post to the Bug Reports category.

To help us investigate and fix this faster, could you edit your original post to include the details from the template below?

Bug Report Template - Click to expand

Where does the bug appear (feature/product)?

  • Cursor IDE
  • Cursor CLI
  • Background Agent (GitHub, Slack, Web, Linear)
  • BugBot
  • Somewhere else…

Describe the Bug
A clear and concise description of what the bug is.

Steps to Reproduce
How can you reproduce this bug? We have a much better chance at fixing issues if we can reproduce them!

  1. …
  2. …
  3. …

Expected Behavior
What is meant to happen here that isn’t working correctly?

Screenshots / Screen Recordings
If applicable, attach images or videos (.jpg, .png, .gif, .mp4, .mov)

Operating System

  • Windows 10/11
  • MacOS
  • Linux

Version Information

  • For Cursor IDE: Menu → About Cursor → Copy
  • For Cursor CLI: Run agent about in your terminal
IDE:
Version: 2.xx.x
VSCode Version: 1.105.1
Commit: ......

CLI:
CLI Version 2026.01.17-d239e66

For AI issues: which model did you use?
Model name (e.g., Sonnet 4, Tab…)

For AI issues: add Request ID with privacy disabled
Request ID: f9a7046a-279b-47e5-ab48-6e8dc12daba1
For Background Agent issues, also post the ID: bc-…

Additional Information
Add any other context about the problem here.

Does this stop you from using Cursor?

  • Yes - Cursor is unusable
  • Sometimes - I can sometimes use Cursor
  • No - Cursor works, but with this issue

The more details you provide, the easier it is for us to reproduce and fix the issue. Thanks!