# Agent stream bug

**URL:** <https://forum.cursor.com/t/agent-stream-bug/151533>\
**Category:** Bug Reports\
**Tags:** chat\
**Created:** [February 11, 2026, 5:38am UTC](https://forum.cursor.com/t/agent-stream-bug/151533 "2026-02-11T05:38:50Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Anmol\_Agrawal](https://avatars.discourse-cdn.com/v4/letter/a/e79b87/32.png) [@Anmol\_Agrawal](https://forum.cursor.com/u/Anmol_Agrawal)\
**Post date:** [February 11, 2026, 5:38am UTC](https://forum.cursor.com/t/agent-stream-bug/151533/1 "2026-02-11T05:38:50Z")

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### Where does the bug appear (feature/product)?

Cursor IDE

### Describe the Bug

The agent stream failed to start. Please reload the window to continue.

### Steps to Reproduce

As soon i type in chat. i got this error

### Screenshots / Screen Recordings

 ![Screenshot 2026-02-11 at 10.48.37 AM.png](https://us1.discourse-cdn.com/cursor1/original/3X/f/6/f6bf028deeca7bfb1f3f84bc04fb60ec99bd0c81.png)

Request ID: 69b2e302-695d-4747-a344-d311787ca59d  
{“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:11441:39887

### Operating System

MacOS

### Version Information

Version: 2.4.31 (Universal)  
VSCode Version: 1.105.1  
Commit: 3578107fdf149b00059ddad37048220e41681000  
Date: 2026-02-08T07:42:24.999Z  
Build Type: Stable  
Release Track: Default  
Electron: 39.2.7  
Chromium: 142.0.7444.235  
Node.js: 22.21.1  
V8: 14.2.231.21-electron.0  
OS: Darwin arm64 24.6.0

### Does this stop you from using Cursor

yes

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<div class="post-metadata">

**Author:** ![deanrie](https://sea3.discourse-cdn.com/cursor1/user_avatar/forum.cursor.com/deanrie/32/1263_2.png) [@deanrie](https://forum.cursor.com/u/deanrie)\
**Post date:** [February 11, 2026, 8:03am UTC](https://forum.cursor.com/t/agent-stream-bug/151533/3 "2026-02-11T08:03:23Z")

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Hey, thanks for the report. This is a known issue. The extension host can hang while initializing the agent, which leads to `ERROR_EXTENSION_HOST_TIMEOUT` / `deadline_exceeded`. A few things you can try:

1. Disable MCP servers (if you have any): Cursor Settings \> Tools & MCP, disable everything and restart Cursor.

2. Clear the global state database:

3. Start without extensions:

4. If nothing helps, try downgrading to an earlier version: [Cursor · Download](https://cursor.com/downloads)

Related threads with more context:

- [Agent-execution-time-out](https://forum.cursor.com/t/agent-execution-time-out/149529)
- [After last update, stuck at “Waiting for extension host”](https://forum.cursor.com/t/after-last-update-stuck-at-waiting-for-extension-host/149538)

The team is aware and is tracking this. Let me know what worked for you.

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**Author:** ![aeyarr](https://avatars.discourse-cdn.com/v4/letter/a/b77776/32.png) [@aeyarr](https://forum.cursor.com/u/aeyarr)\
**Post date:** [February 13, 2026, 2:31pm UTC](https://forum.cursor.com/t/agent-stream-bug/151533/4 "2026-02-13T14:31:42Z")

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I tried all the options.

1. Disabled all MCP servers and extensions - no dice
2. Deleted the vscdb file and restarted, ended up losing all models that existed and was unable to add new ones, none found. Had to restore the old version of the vscdb file
3. Downgraded to older version - no change

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**Author:** ![system](https://sea3.discourse-cdn.com/cursor1/user_avatar/forum.cursor.com/system/32/99069_2.png) [@system](https://forum.cursor.com/u/system)\
**Post date:** [March 7, 2026, 2:32pm UTC](https://forum.cursor.com/t/agent-stream-bug/151533/5 "2026-03-07T14:32:15Z")

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