What is clanker-blocker?

clanker-blocker is a GitHub Action written in Go that automatically blocks users from interacting with your repositories based on community-curated blocklists. Its default list is a publicly maintained Markdown file tracking known bot and spam accounts. When a listed user tries to open an issue or pull request, the action can either block them at the account level or close their submission immediately with a comment and a label. The project provides two independent actions. The first runs on a daily schedule and calls GitHub's block API to apply account-level blocks for all users on the configured lists, preventing blocked accounts from opening issues, pull requests, or comments across every repository where you have admin rights. This requires a personal access token with block permissions, since the built-in GitHub token cannot call the block API. The second action triggers when a new issue or pull request is opened, checks whether the author appears on any configured list, and if so closes the submission with a comment and optionally applies a label named "blocklisted." This version needs no special token and creates a per-repository audit trail. You can extend beyond the default list by pointing to additional Markdown files. Three parsers handle different formats: a table with usernames in the first column, a bulleted list, or one username per line. The README recommends pinning any external list to a specific commit hash rather than a branch if you want to manually review changes before they take effect, since each sync inherits the list maintainer's judgment about who belongs on it.