Streamable Http MCP Server connect behaves strangely

Bug Reports
1

Describe the Bug

After I configured the Streamable Http MCP Server, there were 3 strange state:

  1. It would show “loading tool”, but the MCP tool had actually been successfully loaded and was also available.
  2. If I use the switch button on the right to toggle it on and off once, the MCP will become unavailable. And shows x tools enabled
  3. In the state 2, open the MCP.json file and save it again (CTRL + S), and it will again become loading, but the tool is still usable, just as described in state 1.

Steps to Reproduce

1、Config This Streamable Http MCP Server in Cursor.

 "k-hub": {
      "url": "https://block.sankuai.com/mcp/api/knowledge-hub-mcp?kb=block-plug"
    }

2、And see the MCP server state in Cursor

3、To check MCP tool is available or not，ask Cursor：What’s Affix，use k-hub

Expected Behavior

Mcp server always available，and light show green

Screenshots / Screen Recordings

4.jpg
4.jpg1280×1890 113 KB

Operating System

MacOS

Current Cursor Version (Menu → About Cursor → Copy)

版本: 1.1.3 (Universal)
提交: 1.96.2
日期: 979ba33804ac150108481c14e0b5cb970bda3260
Electron: 2025-06-15T06:37:17.379Z
ElectronBuildId: 34.5.1
Chromium: undefined
Node.js: 132.0.6834.210
V8: 20.19.0
OS: 13.2.152.41-electron.0

Additional Information

Use stdio mcp，It seems all going well.

Does this stop you from using Cursor

No - Cursor works, but with this issue