fix: mcp not authenticated

Open

#13,992 opened on Sep 25, 2025 2 comments 1 reaction 0 assignees View on GitHub

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Assessment

Difficulty: 4/5
Estimated time: 3-5 days
Newbie friendliness: 25/100

Issue type: Bug
Clarity: Needs clarification
Activity status: Stale
Domain: authentication

Research direction

Start by reproducing the issue with ~/.cursor/mcp.json in Cursor using the provided Vercel MCP URL and authentication steps. Determine whether the failure occurs in Cursor's callback handling or Vercel MCP authentication; done means the browser flow returns to Cursor and the server leaves the "Needs authentication" state.

Written by the indexing model from the issue text.

Description

Hi,

Vercel mcp cannot be authenticated on Cursor.

I know this is not vercel cli bug, but don't know where to post.

Environment

macOS: 15.6.1(24G90)
Cursor: 1.6.45 (2025-09-22T18:22:38.013Z)
Config file: ~/.cursor/mcp.json

    {
      "mcpServers": {
        "vercel": {
          "url": "https://mcp.vercel.com"
        }
      }
    }

Steps to Reproduce

Add the above configuration to ~/.cursor/mcp.json.
In Cursor, Vercel MCP shows "Needs authentication".

Click "Connect" → Browser opens with Vercel.
Successfully log in → Cursor reopens.

(Safari is asking "Do you want to allow this website to open 'Cursor.app'?")

A prompt appears from Cursor

Click "Open".

Actual Behavior

After clicking "Open", nothing happens.
Vercel MCP remains stuck in "Needs authentication" state.

Expected Behavior

After authentication, Cursor should connect successfully to Vercel MCP.

Notes

Unclear whether this is a Cursor bug or a Vercel MCP bug.

Dominant language: TypeScript
Stars: 16.3k
Forks: 3.8k
Avg merge: 2m
Merged PRs (30d): 1

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