| github_token | GitHub token for API access | yes | — |
| base_branch | The base branch to compare against (target of PR) | yes | — |
| head_branch | The head branch (source of PR) | yes | — |
| cff_path | Path to the CFF file (default is CITATION.cff) | no | CITATION.cff |
| post_pr_comment | Whether to post a pull request comment (true/false) | no | true |
| show_error_messages_in_pr_comment | Whether to show error messages in pull request comment (true/false) | no | true |
| show_warning_messages_in_pr_comment | Whether to show warning messages in pull request comment (true/false) | no | true |
| show_info_messages_in_pr_comment | Whether to show info messages in pull request comment (true/false) | no | true |
| authorship_for_pr_commits | Include PR commit authors and co-authors as authors | no | true |
| authorship_for_pr_reviews | Include PR reviewers as authors | no | true |
| authorship_for_pr_issues | Include creators of issues linked to the PR as authors | no | true |
| authorship_for_pr_issue_comments | Include commenters on linked issues as authors | no | true |
| authorship_for_pr_comments | Include users who comment directly on the PR as authors | no | true |
| missing_author_invalidates_pr | Invalidate pull request if a new author is missing from the CFF file | — | true |
| duplicate_author_invalidates_pr | Invalidate the pull request if there is a duplicate author in the CFF file | — | true |
| invalid_cff_invalidates_pr | Invalidate the pull request if cffconvert fails to validate the CFF file | — | true |
| can_skip_authorship | Whether manually skipping and unskipping authorship is enabled or not | — | true |
| bot_blacklist | Comma-separated list of bot usernames to ignore | no | github-actions[bot] |