"auto" not working

[fullofcaffeine]

Describe the Bug

I wanted to try auto, which is supposed to be truly unlimited and use frontier models, but I was only able to use it for a few (~3) requests and now it just returns an error:

The model returned an error. Try disabling MCP servers, or switch models.
Request ID: 4804c251-540e-4a7b-9ff0-1a6c775c9916

Backtrace

Request ID: 50588dcd-5fce-473a-9225-4fb1f68f373b
{"error":"ERROR_CUSTOM_MESSAGE","details":{"title":"Model returned error","detail":"The model returned an error. Try disabling MCP servers, or switch models.","additionalInfo":{}},"isExpected":true}
ConnectError: [invalid_argument] Error
    at dTa.$endAiConnectTransportReportError (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:4246:218739)
    at Xjs.S (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:494:17406)
    at Xjs.Q (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:494:17184)
    at Xjs.M (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:494:16272)
    at Xjs.L (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:494:15373)
    at Spt.value (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:494:14165)
    at ye.B (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:46:2398)
    at ye.fire (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:46:2617)
    at NQe.fire (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:4228:10378)
    at u.onmessage (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:6710:12344)

Steps to Reproduce

• Opened Chat
• Selected “Agent” (or a mode based on it)
• Selected “auto” as the model
• Started using it for around 3 requests before it stopped working with the error above.

Expected Behavior

I expect auto to be consistent in availability and quality.

Operating System

MacOS

Current Cursor Version (Menu → About Cursor → Copy)

Version: 1.1.4
VSCode Version: 1.96.2
Commit: e86fcc937643bc6385aebd982c1c66012c98cae0
Date: 2025-06-19T02:12:10.131Z
Electron: 34.5.1
Chromium: 132.0.6834.210
Node.js: 20.19.0
V8: 13.2.152.41-electron.0
OS: Darwin arm64 24.4.0

Does this stop you from using Cursor

Yes - Cursor is unusable

[deanrie]

Hey, have you tried this in non-custom mode? Also, try disabling some MCP servers and check if any are interfering with the agent’s operation.

[fullofcaffeine]

It started working again all of the sudden, I didn’t do anything.

What is the “non-custom” mode?

[deanrie]

You have a custom mode selected called “IMPLEMENT”.

[fullofcaffeine]

Ah, sorry, yes. I tried a non-custom mode and had the same error.

[service]

Same Issue.
I encountered the same problem when using Figma’s official MCP.
After several attempts, only the AI ​​model claude-4-sonnet could complete the AI ​​dialogue normally. I also encountered this problem when the model was set to auto.

Issue Detail:

Request ID: c4825f3a-2b8c-4186-9fe1-cef8a3340272
{"error":"ERROR_CUSTOM_MESSAGE","details":{"title":"Model returned error","detail":"The model returned an error. Try disabling MCP servers, or switch models.","additionalInfo":{},"buttons":[]},"isExpected":true}
ConnectError: [invalid_argument] Error
    at C9a.$endAiConnectTransportReportError (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:4757:223764)
    at dir.S (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:492:17741)
    at dir.Q (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:492:17519)
    at dir.M (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:492:16607)
    at dir.L (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:492:15708)
    at Hwt.value (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:492:14500)
    at ve.B (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:48:2398)
    at ve.fire (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:48:2617)
    at Git.fire (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:4744:10379)
    at u.onmessage (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:6968:12271)

Versions：
Cursor Version: 1.2.1 (Universal)
Operating System: MacOs
Node.js 18.16.1
OS: 15.3.2 (24D81)

[service]

@deanrie Is this a bug?

Request ID: 7769c812-58ef-4dd0-bd46-0543e53d8b9a
{"error":"ERROR_CUSTOM_MESSAGE","details":{"title":"Model returned error","detail":"The model returned an error. Try disabling MCP servers, or switch models.","additionalInfo":{},"buttons":[]},"isExpected":true}
ConnectError: [invalid_argument] Error
    at C9a.$endAiConnectTransportReportError (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:4757:223764)
    at dir.S (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:492:17741)
    at dir.Q (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:492:17519)
    at dir.M (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:492:16607)
    at dir.L (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:492:15708)
    at Hwt.value (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:492:14500)
    at ve.B (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:48:2398)
    at ve.fire (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:48:2617)
    at Git.fire (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:4744:10379)
    at u.onmessage (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:6968:12271)

[deanrie]

Hey, try switching to another model, like Claude.

[service]

So this is a problem with the AI ​​model rather than the Cursor itself?