[BUG] with Google Bigquery connector

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

When I try to install the BigQuery connector I find this error:
The redirect URI used by the connector is https://claude.ai/api/mcp/auth_callback, but it is not registered in the corresponding Google OAuth app — this is an internal Anthropic misconfiguration. You cannot fix this yourself.
What to do:

Report the bug to Anthropic by opening an issue at github.com/anthropics/claude-code/issues — include a screenshot of the error and the note "redirect_uri_mismatch on BigQuery connector"

What Should Happen?

<img width="1175" height="499" alt="Image" src="https://github.com/user-attachments/assets/2a9581c0-36b8-4fc9-8e69-00db614b51e2" />

Error Messages/Logs

https://accounts.google.com/signin/oauth/error?authError=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&flowName=GeneralOAuthFlow&client_id=551893818490-ugr57r3c1h5ojkjfh74uv9opbcntgku9.apps.googleusercontent.com&aes=AbzcAbGj2eHQam_9TMV5C0GcOH-Z

Steps to Reproduce

Here are the steps to follow on Claude.ai:

1. Go to claude.ai in your browser and make sure you're logged into your account
2. Open Settings — click on your profile picture or initial in the bottom left, then click Settings
3. Look for the Connectors (or Integrations) section in the settings side menu
4. Find BigQuery in the list of available connectors and click on it
5. Complete the Google OAuth flow — you'll be asked to sign in with your Google account and authorize access to your BigQuery projects

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

Sonnet 5.0

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

_No response_