Context

You may encounter Failed to post review comments errors when CodeRabbit attempts to submit reviews with the request changes workflow enabled. This typically happens when CodeRabbit tries to request changes on a pull request, but GitHub blocks the action due to repository or organization-level review restrictions.

Answer

This issue is caused by GitHub’s Code Review Limits feature.

When Code Review Limits are enabled, GitHub restricts who can submit reviews that approve or request changes on pull requests. While anyone can still leave regular comments, only users explicitly granted read access or higher can submit reviews that approve or request changes.

If this setting is enabled at the organization level, it overrides any repository-level configuration.

To resolve this issue:

1. Check your GitHub repository settings by going to:
   Repository → Settings → Access → Moderation options → Code review limits

2. Look for the setting: “Limit to users explicitly granted read or higher access”

3. If this setting is enabled, you have two options:

   1. Option 1: Disable the setting at the repository or organization level.

   2. Option 2: Keep the setting enabled, but ensure CodeRabbit has at least read access or higher to the repository.

After making the change, re-enable the request changes workflow in your CodeRabbit settings.

If you continue to experience issues after making these changes, try uninstalling and reinstalling CodeRabbit on the affected repositories to refresh authentication and permissions.