Stuntdouble MCP Server

Stunt Double MCP Server

Deploy AI user personas to validate user journeys at scale. Find UX friction before real users do.

Stunt Double deploys AI agents with realistic user personas to validate user journeys at scale. Create actors, run automated workflows and checklists against any web app, and surface friction points before real users encounter them. Integrates with Claude, Linear, GitHub, and Slack.

This repository

This repo holds plugin and MCP configuration (.cursor-plugin/plugin.json, root mcp.json, server.json), plus skills, agents, and Cursor rules. There is no package.json and no runnable server here — the MCP endpoint is hosted at https://app.stuntdouble.io/api/mcp from the main Stunt Double codebase. See CONTRIBUTING.md for how to validate edits and avoid confusing this folder with a Node package.

Quick Start

Claude Code

claude mcp add --transport http stuntdouble https://app.stuntdouble.io/api/mcp

Claude Desktop

Go to Settings → Connectors → Add and paste:

https://app.stuntdouble.io/api/mcp

Cursor / Windsurf

Add the mcpServers block below to an MCP config file:

• Project-local (recommended for this repo clone): .cursor/mcp.json at the root of your project.
• Global (all projects): ~/.cursor/mcp.json on macOS/Linux (see Cursor MCP docs for your OS).

{
  "mcpServers": {
    "stuntdouble": {
      "url": "https://app.stuntdouble.io/api/mcp"
    }
  }
}

Use only url for remote servers (Streamable HTTP is negotiated automatically). Extra keys such as "type": "streamable-http" are not part of Cursor's documented mcp.json shape and can break plugin validation.

Cursor marketplace (one-click install) expects a plugin layout: .cursor-plugin/plugin.json plus root mcp.json. Those files are in this repo. The plugin logo path is assets/logo.png (bundled in this repository). The server.json file is the separate MCP registry manifest for mcp-publisher and directory listings; Cursor's installer does not use it.

Authentication

Authentication is handled automatically via OAuth 2.1 with PKCE. The first time your AI client connects, a browser window will open for you to sign in and authorise access to your Stunt Double account. No API keys or tokens required.

For Cursor, the OAuth redirect URI is fixed to cursor://anysphere.cursor-mcp/oauth/callback (docs).

Available Tools

Workspaces

Projects

Actors

Knowledge

Conversations

Checklists

Workflows

Feedback

GitHub

Interviews

Structured user interviews — actors or generated personas run through a discussion guide (sections + questions/tasks) against a target URL, then Stunt Double synthesises themes and recommendations.

Prompts

Most MCP clients (Claude, Claude Code, Cursor) surface these as slash commands. Each is a self-contained recipe: which tools to call, in what order, and how to report back.

Workspace member administration (inviting/removing members) is available in the web dashboard.

Transport

This server uses Streamable HTTP transport. The endpoint is:

https://app.stuntdouble.io/api/mcp

Links

• Website
• Documentation
• llms.txt

Verifying changes

From the repo root:

node scripts/validate-json.mjs
npx --yes prettier@3.4.2 --check README.md mcp.json server.json .cursor-plugin/plugin.json

More context in CONTRIBUTING.md. GitHub Actions runs the same checks on push and pull requests.

License

MIT