What is claude-code-action?

Claude Code Action lets you bring AI directly into your GitHub pull requests and issues. Instead of jumping into a separate tool to ask questions about your code or request changes, you simply leave a comment on a PR or issue with a trigger phrase, and Claude jumps in to help, answering questions, reviewing code, or even implementing fixes and new features right there in the conversation. At a high level, it works by listening for specific comments on your GitHub items. When someone tags Claude with the right phrase, the action runs on your own GitHub infrastructure and sends the request to Claude through whichever AI provider you've configured, Anthropic's own API, Amazon Bedrock, or Google Vertex AI. Claude then reads the relevant code, responds in the comment thread, and can make actual changes to files. As it works, it updates a progress checklist so everyone can see what's done and what's still in progress. This is useful for teams who want an extra pair of hands during code review. For example, a developer could ask Claude to explain a confusing function, suggest improvements on a PR, or implement a small refactor that reviewers flagged, all without leaving GitHub. A founder or PM managing a small engineering team could use it to get quick answers about what a PR actually does before approving it. It can also handle automated workflows, like running reviews on every new PR. One notable aspect is that everything runs on your own GitHub runners rather than on shared infrastructure, which gives you control over the environment. The project is also heading toward a v1.0 release that will simplify setup significantly by removing the need to manually pick modes and reducing the number of configuration options. If you're evaluating it now, it's worth knowing that breaking changes are on the horizon.