Introduction

rapid is a local video studio that Claude Code drives. A brief goes in; agents storyboard it, build each scene as an HTML page, review the frames, and render the scenes in parallel; an MP4 comes out. Everything runs on one Mac. Nothing is hosted.

#How it works

• Deterministic scenes. A scene is HTML, CSS, and pinned libraries under a virtual-time runtime that owns every clock the page can read. Frame k draws the same pixels in any order, so a scene renders in parallel chunks. See scenes.
• Linked styles. A scene links its style (rapid:style) instead of copying it: palette, faces, type scale, margins, motion, a sound map, a stylesheet for the kit, and taste.md, the rules reviewers judge by. A format is the deliverable: frame, rate, guides, the phone copy's size cap. See styles and formats.
• A job graph. A video is a job: nodes (storyboard, key frames, builds, renders, checks, reviews, approvals, join, mix, mux, phone copy) run like a build system, with fingerprints and staleness, queued through lanes. See the job graph.
• Two-pass review. Code checks every frame first (crops, the readable band, keep-outs, the safe area, text size, fonts, script errors, dead time, layout). A reviewer agent then reads a contact sheet against the style's taste and writes marks. A person's notes are the same marks. See review.

#The parts

Scene code, frames, contact sheets, and WAVs stay in the project. Agent sessions talk to Claude; GitHub is contacted only to fetch a style. A look lives in a style and a cast in a project; neither lives in code.

Next: install, then your first video.