Cursor·Fixdeployintermediate

Cursor MCP Server Not Connecting

Quick Answer

How do I fix Cursor MCP Server Not Connecting?

Missing or malformed .cursor/mcp.json file, or Node.js version too old for the MCP server. Start with "Check .cursor/mcp.json" before making broader code changes.

Fix signals

What this answers: Why cursor mcp server not connecting happens and what to change first.
Fastest move: Check .cursor/mcp.json
Use this page if: MCP tools not appearing in Cursor

If this keeps happening

Open the next decision, not just the patch

Use these when the current fix is helpful, but the real answer is a better tool choice, a cleaner workflow layer, or a more trustworthy launch path.

Cursor review

Open this when the issue is making you decide whether a more code-first workflow is still the right long-term move.

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Lovable reviews

Open this when the bug is making you reconsider whether a faster generated path would reduce the operational overhead.

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Deploy hub

Open this when the fix is exposing a broader production handoff problem, not just one bug in the code.

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Tool picker

Open this when repeated failures are pushing the decision back up to the stack level.

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Firecrawl review

Open this when the app also needs live web data and the bigger stack question is no longer just about the coding tool.

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Quick Fix Summary

Most likely cause	Missing or malformed .cursor/mcp.json file, or Node.js version too old for the MCP server.
Fastest fix	Check .cursor/mcp.json
Use this page if	MCP tools not appearing in Cursor

You're in the right place if...

!MCP tools not appearing in Cursor
!Connection error in MCP settings
!Timeout when trying to use MCP

Why this happens

Missing or malformed .cursor/mcp.json file, or Node.js version too old for the MCP server.

Fix

Check .cursor/mcp.json

Verify the file exists and is valid JSON:

{
  "mcpServers": {
    "supabase": {
      "command": "npx",
      "args": [
        "-y",
        "@supabase/mcp-server-supabase@latest",
        "--supabase-url", "YOUR_URL",
        "--supabase-key", "YOUR_KEY"
      ]
    }
  }
}