Stunt Double

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

Account

Tool	Description
get_me	The account this connection acts as: id, email, name, timezone, notification channel

Notification channel and timezone are account settings rather than workspace ones, so they are the same answer in every workspace. Pass the timezone when creating a scheduled workflow, or "every weekday at 9" becomes nine in UTC.

Workspaces

Tool	Description
list_workspaces	List your workspaces
get_workspace	Get workspace details by ID or slug, including its admin-set controls (settings)
list_workspace_members	List members of a workspace

get_workspace reports the workspace security controls under settings: public sharing, the feedback widget, self-hosted workers, and the network policy. They are ceilings set by an admin, so a feature switched off there cannot be switched back on for a single project.

Search

Tool	Description
search	Search a workspace across projects, actors, checklists, interviews, automations, issues, goals, feedback, actor knowledge, insights, design reviews, project resources and conversations. Ranked, with optional filters

search takes a workspace_id plus an optional query, types filter, project_id filter and limit (max 50). Terms are matched as prefixes, so a partial word is enough. Omit query to browse the most recently updated items. Results carry the id you need for the matching getter, so it is usually cheaper than listing an entity type and filtering the list yourself. Reach for it before creating anything, to find the actor or checklist that already covers the job.

Projects

Tool	Description
list_projects	List projects in a workspace
get_project	Get a project (the product tracked by checklists, workflows, feedback)
create_project	Create a project (a product to track with checklists, workflows, feedback)
list_project_mcp_servers	The MCP servers this project's runs can reach

A project is archived, never deleted, and an archived project reads as missing from every tool here. Registering an MCP server and attaching it to a project are workspace-admin actions in the dashboard; list_project_mcp_servers is how you check what tools a run will actually have before writing a checklist that depends on one.

Guidelines

Standing rules the team holds the product to: design system, tone of voice, brand, content, accessibility, compliance, security, performance, or shared knowledge. A guideline is owned by the workspace and attached to the projects it applies to, so one rule can hold for every project without being retyped. Whatever is in force is rendered into every checklist run, design review, interview and triage for that project.

Tool	Description
list_workspace_guidelines	The workspace library, with how many projects hold each rule
add_workspace_guideline	Add a rule to the library, optionally attaching it to projects
update_workspace_guideline	Edit a rule, switch it off, or apply it to every design review in the workspace
remove_workspace_guideline	Remove a rule from the library, detaching it from every project
list_project_guidelines	The rules this project is held to
add_project_guideline	Record a rule and hold this project to it
set_project_guideline	Attach a library rule to a project, detach it, or switch it off there

Two switches decide whether a rule is in force for a project: the library's enabled and the attachment's. list_project_guidelines folds them into one enabled so you never have to reason about both. A rule with apply_to_design_reviews set also holds for design reviews raised from Slack or Linear, which carry no project to attach it through.

Codify a standard as a guideline rather than repeating it in each checklist, and search the library before writing a new rule: attaching the one that already exists keeps the team's standard in a single place to edit.

Actors

Tool	Description
list_actors	List active actors in a workspace
get_actor	Get actor details including system prompt and capabilities
create_actor	Create a new actor in a workspace
update_actor	Update actor name, description, system prompt, capabilities, or status. Set status to "archived" to soft-delete

Knowledge

Tool	Description
list_actor_knowledge	List knowledge entries for an actor
add_actor_knowledge	Add a knowledge entry to an actor
remove_actor_knowledge	Remove a knowledge entry

Conversations

Tool	Description
list_conversations	List conversations, optionally filtered by actor
get_conversation	Get a conversation with its messages

Checklists

Tool	Description
list_checklists	List checklists in a workspace
get_checklist	Get checklist details, checks, and recent runs
get_checklist_run	Get a checklist run with per-check results
run_checklist	Trigger a checklist run (async). Returns run ID
create_checklist	Create a browser-based QA checklist (host via project or URL, actor, instructions, checks)
update_checklist	Update a checklist (pass checks to replace the full set)
delete_checklist	Delete a checklist and its checks and runs

Workflows

Tool	Description
list_workflows	List workflows in a workspace
get_workflow	Get workflow details with steps and recent runs
run_workflow	Trigger a workflow run (async). Returns run ID
get_workflow_run	Get a workflow run with step-level details
create_workflow	Create a workflow (multi-step automation)
update_workflow	Update a workflow's name, description, or trigger
toggle_workflow	Activate or pause a workflow
delete_workflow	Delete a workflow and its steps and runs
add_workflow_step	Append a step to a workflow
update_workflow_step	Update a workflow step type, config, or sort order
remove_workflow_step	Remove a step from a workflow

Feedback

Tool	Description
list_feedback	List feedback for a project, newest first
get_feedback	Get a feedback submission with its replies
update_feedback_status	Update feedback status

GitHub

Tool	Description
list_pull_requests	List pull requests for a GitHub repository
get_pull_request	Get details for a GitHub pull request (title, author, branches, stats)
comment_on_pr	Post a comment on a GitHub pull request

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.

Tool	Description
list_interviews	List interviews in a workspace, optionally filtered by project
get_interview	Get an interview with its discussion guide (sections + items) and participants
create_interview	Create a new interview in a project (name, target URL, research brief)
update_interview	Update an interview's name, target URL, research brief, or status
add_interview_section	Add a section to the discussion guide
add_interview_item	Add a question or task to a section
add_interview_participant	Attach a participant — either an existing actor or an ad-hoc persona_spec
get_interview_participant	Get a participant including their full transcript from the run
get_interview_report	Get the current synthesised report (summary, themes, recommendations, per-question rollup)
launch_interview	Launch the interview round (async). Returns the trigger run ID
regenerate_interview_report	Re-run synthesis on existing transcripts (async). Returns the trigger run ID

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.

Prompt	Description
validate_design	Validate a live design, prototype, or preview URL (Figma Make, Claude artifact, v0, staging) with AI personas
verify_change	Verify a shipped or previewed code change by running an actor through the affected flows, optionally commenting on the PR
run_user_research	Run a structured multi-persona interview study and synthesise themes and recommendations
triage_feedback	Triage user feedback on a project: cluster it, reproduce issues with an actor, and update statuses
setup_guardrails	Stand up checklists for critical flows plus a workflow that re-runs them on a schedule or on deploy/PR events
check_brand	Audit a product against brand and tone-of-voice guidelines, flagging deviations with evidence
check_design_system	Audit a live product against its design system (typography, colour, spacing, components) on rendered pages
check_compliance	Check a product against legal and compliance requirements and collect evidence for counsel to review
check_continuity	Check continuity across surfaces (pricing, terminology, promises) between marketing, product, docs, and emails
stuntdouble_guide	Orientation for Stunt Double: what it does, when to reach for it, and the full tool catalogue

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