# Troubleshooting (/studio/troubleshooting)

# Troubleshooting [#troubleshooting]

## Doctor [#doctor]

Start here. Doctor checks everything a local run needs, one line each:

```text
/stuntdouble:doctor
```

Outside Claude Code, run it in a terminal:

```sh
npx -y stuntdouble doctor
```

A `FAIL` line blocks local runs until you fix it. A `note` line is worth
reading but doesn't block anything.

## Node [#node]

Studio needs Node 22.18 or later. On an older Node, the local server stops at
start with a message naming the version it found. Update Node, then restart
Claude Code.

If the Studio tools are missing altogether, the local server didn't start.
Check `node --version` and that `npx` works, then look at the server in `/mcp`.
The first tool listing takes a second or two while `npx` starts. That's
normal.

## Chrome [#chrome]

Studio uses Google Chrome, or Playwright's Chromium when Chrome isn't
installed. If doctor reports no Chrome, install Google Chrome, or run:

```sh
npx playwright install chromium
```

## The viewer port [#the-viewer-port]

The viewer starts at port 4747 and moves to the next free port if that one is
taken. Doctor tells you which. Always open the link Studio prints rather than
typing the port.

## Billing [#billing]

Stunt Double makes no model calls for local runs. Your coding agent does the
work, so local runs count against whatever account Claude Code is signed in
with: your Claude plan, or your API key if Claude Code uses one. Run `/status`
in Claude Code to see which.

If `ANTHROPIC_API_KEY` is set in your environment, doctor adds a note: when
Claude Code uses that key, local runs are billed to it rather than your Claude
plan.

Studio in your browser, and `npx stuntdouble run`, use only the connection
you set in Settings: your Anthropic API key or OpenAI-compatible endpoint is
billed for those runs. They never use a Claude subscription.

[Cloud runs](/studio/cloud-runs) are billed to your Stunt Double plan instead.

## A hosted server in `/mcp` asks to sign in [#a-hosted-server-in-mcp-asks-to-sign-in]

The plugin also adds the hosted server for [cloud runs](/studio/cloud-runs).
You can leave it signed out, since local runs don't use it.

## Skills or commands missing after install [#skills-or-commands-missing-after-install]

Plugins load when a session starts. Start a new Claude Code session.