Question about cursor MCP protocol

[Peyton_Tolbert]

Describe the Bug

MCP server status red when tools have been received

Steps to Reproduce

Connecting to my MCP server, using oauth to sign in. Tool list is returned but the status icon is red

Expected Behavior

Green status icon indicating the MCP server is ready and on

Screenshots / Screen Recordings

Operating System

Windows 10/11

Current Cursor Version (Menu → About Cursor → Copy)

Version: 1.2.4 (user setup)
VSCode Version: 1.99.3
Commit: a8e95743c5268be73767c46944a71f4465d05c90
Date: 2025-07-10T17:09:01.383Z
Electron: 34.5.1
Chromium: 132.0.6834.210
Node.js: 20.19.0
V8: 13.2.152.41-electron.0
OS: Windows_NT x64 10.0.26100

Additional Information

I need to know the messaging protocol that cursor is expecting for the MCP server connection. A file protocol would be helpful, but even just the ending for status to be green would be great

Does this stop you from using Cursor

Yes - Cursor is unusable

[Peyton_Tolbert]

bump. Anyone from cursor team have the messaging protocol? I am struggling to get my mcp’s tools to list with cursor having the green status icon for the server.

[condor]

Hi @Peyton_Tolbert and welcome to Cursor Forum.

Thank you for the bug report.

Could you check the Cursor bottom pane Output tab, there is the option for MCP Logs

Please report the errors in the log there.

Overall MCP is defined by Anthropic though each MCP is created by 3rd party developers, so it would be best to contact the MCP dev as they would have experience with other users configuring their MCP for Cursor.