Claude Opus 4.5 keeps hanging in agent mode

Support Bug Reports
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1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

Every day when working with Agent mode, it keeps “hanging” or getting stuck and I have to ask it to continue. It will not continue on its own. Even asking it continue will usually just make it hang again. Its always when calling an MCP tool or making edits to a file.

Steps to Reproduce

Work with agent mode and have it call an MCP tool or making edits to a file.

Expected Behavior

It doesn’t hang forever!

Screenshots / Screen Recordings

Screenshot 2026-01-29 at 8.32.00 AM.png
Screenshot 2026-01-29 at 8.32.00 AM.png538×325 6.21 KB

Operating System

MacOS

Version Information

Version: 2.4.22 (Universal)
VSCode Version: 1.105.1
Commit: 618c607a249dd7fd2ffc662c6531143833bebd40
Date: 2026-01-26T22:51:47.692Z
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

For AI issues: which model did you use?

Claude Opus High 4.5

Does this stop you from using Cursor

Sometimes - I can sometimes use Cursor

3

Hey, thanks for the report. I saw a very similar case recently: the agent freezes when using MCP tools and editing files. In that case, the issue was network-related (a VPN + HTTP/2 conflict).

Try this workaround:

  1. Add this to settings.json:
    "cursor.general.disableHttp2": true
  2. If you’re using a VPN or a corporate network, try without it
  3. Restart Cursor

For debugging, we need a bit more info:

  • Next time it freezes, copy the Request ID (chat menu on the right > Copy Request ID)
  • Cursor Settings > Network > Run Diagnostics, please share a screenshot of the results
  • Help > Toggle Developer Tools > Console, if you see any red errors when it freezes, please screenshot them

One more question: does this happen only with Opus 4.5, or with other models too?

Related: Frequent Agent Freezing During Tool-Based Responses