Stunt Double Studio
Check your change before you push it. Studio runs a Stunt Double checklist in a Chrome on your own machine, from the coding agent session you already have open or from Studio in your browser. Point it at localhost, staging or production. An actor goes through the flow, judges each check and leaves the evidence in your project.
- Price
- Free
- Account
- None needed
- You need
- Node 22.18 or later and Google Chrome (or Playwright's Chromium)
What you get
- Runs on your machine. The actor drives a local Chrome, so it reaches
localhost, a staging site behind your VPN, or production. - Runs on the model you already have. From your coding agent, the agent is the actor, so local runs use your Claude plan (or your API key, if Claude Code uses one). Studio in your browser uses a connection you set up: an Anthropic API key or an OpenAI-compatible endpoint. Stunt Double makes no model calls for local runs.
- Runs are files. Actors, checklists and every run live in
.stuntdouble/in your project. Commit them, review them in a pull request, and share them with your team like any other file. - A viewer for the evidence. A local page shows each check's verdict, the screenshots and the activity log as the run happens, with a button to stop it.
Start here
claude plugin marketplace add stunt-double/stuntdouble-mcp
claude plugin install stuntdouble@stuntdoubleThen, in Claude Code:
/stuntdouble:setup
/stuntdouble:run <checklist>Or open Studio in your browser, on your own model connection:
npx stuntdouble studioInstall and set up covers each step and other agents.
Studio and cloud runs
Studio verdicts are self-judged: the same agent that went through the flow
decides whether each check passed. When you need more, a
cloud run on the hosted server adds an independent
judge, runs in parallel and on a schedule, and triggers on deploys, pull
requests and Figma changes. /stuntdouble:cloud <checklist> moves a local
checklist to a workspace with the same actor and checks. A localhost URL
needs a public or preview URL for the cloud.
| Studio | Cloud runs | |
|---|---|---|
| Where the browser runs | Chrome on your machine | Hosted browsers |
| Who pays for the model | Your Claude plan, or your own API key | Your Stunt Double plan |
| Account | None | A Stunt Double workspace |
| Verdicts | Self-judged by your agent | Independent judge |
| When it runs | When you ask | On demand, on a schedule or on a trigger |
In this section
- Install and set upAdd the plugin, check your machine and write your first checklist.
- Run a checklistStart a run, resume one, and read the result.
- The viewerWatch a run, read the evidence and stop a run early.
- Files and commandsWhat lives in .stuntdouble/ and every command Studio takes.
- Cloud runsMove a checklist to a workspace for scheduled, judged runs.
- TroubleshootingDoctor, Node, Chrome, the viewer port and billing.