PR Preview

PR Preview is a free, open-source command-line tool that enables users to record before-and-after videos of changes introduced by a pull request. The tool is designed to work with Claude Code and MCP, allowing users to describe a user journey or flow, which PR Preview then executes by driving the application in a real Chrome window. This process automatically generates video clips that show the application's state before and after the changes, providing reviewers with a visual summary of what a pull request modifies. Installation is handled via npm, and the tool runs locally on the user's machine, ensuring that no data is uploaded externally. PR Preview requires a one-time setup involving the addition of a development dependency, downloading Chromium via Playwright, and initializing the configuration so that Claude Code can interact with it. Once configured, users can prompt Claude Code to record a specific flow, and the resulting before.mp4 and after.mp4 files are saved to a designated output directory. Alternatively, a slash command is available to manually trigger recordings by specifying a URL and journey description. The tool supports any development framework, as it operates by driving the user's actual development server. Video output is provided in MP4 format using ffmpeg, with a high-quality GIF fallback available if ffmpeg is not present. All processing and storage remain local, with no uploads involved. PR Preview is aimed at developers who want to enhance the clarity of code reviews by providing visual evidence of changes, and it integrates specifically with the Claude Code environment. evidence_sufficient=true