What is comment-on-pr?

Comment-on-PR is a GitHub Action that automatically posts a message on an open pull request whenever a commit is pushed to it. Instead of manually typing reminders or notes every time someone updates their code, this tool handles it for you. It's a simple way to make sure everyone involved in a code review sees the same information right on the PR page. The tool works by listening for specific GitHub events, specifically "push" and "pull_request" activities. When you set it up in your repository, you give it a message (called the msg parameter) that you want it to post. When the right event happens, the action uses your repository's built-in access token (GITHUB_TOKEN) to automatically leave that exact message as a comment on the relevant pull request. The setup involves adding a short configuration file to your project telling the action when to run and what to say. This tool is perfect for project managers, team leads, or anyone managing a collaborative coding project who wants to automate repetitive communication. For example, if your team requires contributors to update their documentation whenever they change code, you could use this action to automatically post a reminder like "Did you update the docs?" on every pull request. Another example: you might want to automatically thank contributors for their first submission, or post a link to your team's coding guidelines on every new PR. It saves you from having to remember to leave these standard messages manually. The tool is straightforward and does exactly what it promises without unnecessary complexity. The README doesn't go into detail about advanced customization or conditional logic, so it appears to be designed as a simple, single-purpose utility rather than a feature-rich automation platform. You define a static message, and it posts that message when triggered. This makes it very easy to adopt, though it means you won't get dynamic messages that change based on what code was actually pushed.