[BUG] GitHub repo not accessible via "Add from GitHub" in claude.ai Chat despite successful connection

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?

My GitHub repository does not appear / is not readable via the "Add from GitHub" feature in claude.ai Chat, even though the GitHub App connection itself now completes without error.

GitHub Username: RamonRDR
Repository: python-study-guide (https://github.com/RamonRDR/python-study-guide)

What Should Happen?

After connecting the GitHub App with access granted to python-study-guide, the repository and its files should be browsable and readable via "Add from GitHub" in Chat.

Error Messages/Logs

{"type":"error","error":{"type":"invalid_request_error","message":"state: Field required"},"request_id":"req_011Cem1kqkB852j8n5oHNySX"}

(also occurred previously with request_id req_011CekzjSLsJs5bpywwsdYfB)

Steps to Reproduce

1. Install the Claude GitHub App (Claude Github MCP Connector) with access to the python-study-guide repository
2. Received "state: Field required" error during the connection/redirect flow
3. Revoked authorization on GitHub's side and reinstalled the app from scratch
4. Reconnected the GitHub integration in claude.ai Settings > Connectors — connection now completes without error
5. In a Chat conversation, used "Add from GitHub" and selected the python-study-guide repository
6. No files appear to browse/select, and Claude is unable to read repository content

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

N/A - using claude.ai web Chat, not Claude Code CLI

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Other

Additional Information

_No response_