[BUG]: React Bits MCP Cloudflare Worker `/sse` endpoint broken – works only with `/mcp` direct URL in Cursor

[Muhamed555]

Describe the issue

When I add the React Bits MCP server to Cursor using the docs example:

{ "mcpServers": { "react-bits-mcp": { "command": "npx", "args": ["mcp-remote", "https://react-bits-mcp.davidhzdev.workers.dev/sse"] } } }

Cursor detects the server but no tools are available.
Running npx mcp-remote https://react-bits-mcp.davidhzdev.workers.dev/sse gives:

Error POSTing to endpoint (HTTP 404): Not Found SSE error: Could not convert argument of type symbol to string.

So the /sse endpoint does not work as expected.

However, when I switch to using a direct URL:

{ "mcpServers": { "react-bits-mcp": { "url": "https://react-bits-mcp.davidhzdev.workers.dev/mcp", "headers": {} } } }
it works perfectly, and Cursor loads all tools.

Expected:
The /sse endpoint should work with mcp-remote (as described in the docs), or the documentation should be updated to show the /mcp direct URL method which currently works.

Reproduction Link

No response

Steps to reproduce

Clone latest Cursor.

1- Add MCP server with /sse endpoint.

2- Restart Cursor.

3- Try to access tools.

4- Observe empty tool list.

Validations

• I have checked other issues to see if my issue was already reported or addressed

[DavidHDev]

It won't work for long on either paths. The daily limits are hit, that's why no tools are available. Please don't open issues for this.