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Coder Agents leverages your existing external authentication configuration to power the in-chat diff viewer. Self-hosted GitHub Enterprise deployments require one additional setting (API_BASE_URL) for this feature to work.

Note

Only github type external auth providers are supported today.

GitHub Enterprise configuration

For public github.com, no additional configuration is needed.

For self-hosted GitHub Enterprise, add API_BASE_URL to your existing configuration:

CODER_EXTERNAL_AUTH_0_ID="primary-github"
CODER_EXTERNAL_AUTH_0_TYPE=github
CODER_EXTERNAL_AUTH_0_CLIENT_ID=xxxxxx
CODER_EXTERNAL_AUTH_0_CLIENT_SECRET=xxxxxxx
CODER_EXTERNAL_AUTH_0_AUTH_URL="https://github.example.com/login/oauth/authorize"
CODER_EXTERNAL_AUTH_0_TOKEN_URL="https://github.example.com/login/oauth/access_token"
CODER_EXTERNAL_AUTH_0_VALIDATE_URL="https://github.example.com/api/v3/user"
CODER_EXTERNAL_AUTH_0_API_BASE_URL="https://github.example.com/api/v3"
CODER_EXTERNAL_AUTH_0_REGEX=github\.example\.com

Without API_BASE_URL, Coder defaults to https://api.github.com. Clone and push still work (they use AUTH_URL and TOKEN_URL directly), but the diff viewer silently fails because Coder builds its URL-matching patterns from the API base URL.

Note

If you have both a github.com and a GHE external auth config, only the GHE config needs API_BASE_URL.

Troubleshooting

Diffs not appearing on GHE

Add API_BASE_URL to your GHE external auth config and restart Coder. Diffs should appear within a couple of minutes.

Users not seeing diffs

The chat owner must have linked their account through the relevant external auth provider.

Checking logs

Look for gitsync warnings such as no provider for origin or resolve token errors.