Agent failed error

Support Bug Reports
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1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

I frequently encounter this error. “Agent Stream Start Failed,” and it always asks to reload the window. Is this something that everyone noticed in recent times?

Steps to Reproduce

Open a new chat, and randomly, this issue pops up

Expected Behavior

always ask to reload the window

Screenshots / Screen Recordings

Screenshot 2026-02-26 121236.png
Screenshot 2026-02-26 121236.png830×121 3.45 KB

Operating System

Windows 10/11

Version Information

Version: 2.5.25 (user setup)
VSCode Version: 1.105.1
Commit: 7150844152b426ed50d2b68dd6b33b5c5beb73c0
Date: 2026-02-24T07:17:49.417Z
Build Type: Stable
Release Track: Default
Electron: 39.4.0
Chromium: 142.0.7444.265
Node.js: 22.22.0
V8: 14.2.231.22-electron.0
OS: Windows_NT x64 10.0.26100

For AI issues: which model did you use?

Agent - Auto

Does this stop you from using Cursor

Yes - Cursor is unusable

3

Hey, this is a known issue. The extension host can hang while the agent is initializing.

A few things to try:

  1. Disable HTTP/2: App Settings Ctrl + , → search for “HTTP/2” → enable “Disable HTTP/2”. Restart Cursor. This often helps on Windows.

  2. Disable MCP servers (if any): Cursor Settings > Tools & MCP → turn them all off, then restart.

  3. Start without extensions:

    cursor --disable-extensions

    If that helps, re-enable extensions one by one to find the one causing the issue.

  4. Clear the state database:

    • Fully close Cursor
    • Delete or rename: %APPDATA%\Cursor\User\globalStorage\state.vscdb
    • Start Cursor again (you’ll need to sign in again)

The team is aware of this issue. If none of this helps, please share the Request ID from the next failed request and the result of the network diagnostics (Cursor Settings > Network > Run Diagnostics).

Also, are you using a VPN or a corporate proxy?

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