Product Stack

An overview of the tools, services, AI tooling and integrations we use to build and run Stunt Double.

_{01 Daily Drivers · 02 Engineering · 03 Design · 04 Models · 05 AI and Agents · 06 Claude Code Setup · 07 Open Source · 08 Payments and Email · 09 Observability · 10 Security and Networking · 11 Productivity}

Daily Drivers

• Claude Code: Agentic development in the terminal, desktop app, web and cloud sessions
• Claude: Desktop and web assistant, connected to our tools via MCP connectors
• Cursor: In-editor prompting
• Dia: AI browser
• Linear: Issues, projects, cycles and triage
• Slack: Team communication
• 1Password: Passwords, secrets and certificates
• Raycast: Launcher, snippets, window management and AI extensions
• iTerm2: Terminal for Claude Code sessions
• LM Studio: Running local models on Apple silicon
• Homebrew: macOS package manager

Engineering

• TypeScript: One language across the full stack (TypeScript 6 and the native TypeScript 7 compiler)
• Next.js 16: App Router, Server Components, Turbopack and React 19
• Nx: Monorepo with incremental builds and caching
• pnpm: Package manager (Node 22+)
• Vercel: Hosting, preview deployments, Sandbox, OIDC, toolbar and BotID
• Supabase: Postgres, auth, storage, realtime and preview branches per PR
• Trigger.dev v4: Background jobs, agent runs and orchestration
• Cloudflare Workers: Edge compute for inbound email and a Workers-hosted browser agent (Agents SDK, Workers AI, Browser Rendering)
• Tauri 2: Native macOS desktop app
• Swift: Native iOS app
• Docker: Containers for local services and agent sandboxes
• Figma Plugin API: Stunt Double for Figma
• Zod 4: Schema validation
• ESLint + Prettier: Linting and formatting
• Changesets + tsup: Versioning and builds for our open source packages
• GitHub: Source control, Actions and the GitHub Packages registry

Design

• Figma: Design, slides, prototyping, design system and Code Connect
• shadcn/ui + Radix UI: Component foundations for our UI
• Tailwind CSS v4: Utility-first styling
• Fumadocs: Brand and design system documentation site
• Three.js + Paper Shaders: Shaders and visual effects
• React Flow: Node-based workflow and diagram editors
• Klim: Fonts
• Continuity icons: Our in-house icon pack (@stunt-double/icons)

Video and motion

• HyperFrames: Product videos written as HTML and rendered to MP4
• ElevenLabs: Voiceover, sound effects and music
• Rotato: Product mockups and video
• React Spring: Animation

Models

Cloud

• Anthropic Claude: Primary model family (Opus, Sonnet and Haiku) via the Anthropic API and Vertex AI
• Google Vertex AI: Claude and Gemini via Google Cloud
• OpenAI: Embeddings and supporting models
• Cloudflare Workers AI: Open models at the edge

Local

• LM Studio: Running and serving models locally over an OpenAI-compatible API
• Laya MLX: Native MLX runtime for Laya typed decision models, powering Switchboard's per-prompt model triage in around 10ms
• Qwen: Open-weight models from Alibaba
• Gemma: Open-weight models from Google

AI and Agents

• Claude Agent SDK: Building agents on Claude
• Vercel AI SDK v7: Unified interface across Anthropic, OpenAI, Google and Vertex, with MCP and OpenTelemetry support
• Cloudflare Workers: Agent runtime via the Agents SDK, with Workers AI and Browser Rendering
• Cloudflare AI Gateway: Caching, rate limiting, logging and fallbacks across model providers
• Browserbase + Stagehand v4: Browser infrastructure for our AI actors
• Puppeteer + Cloudflare Browser Rendering: Browser drivers
• Playwright MCP: Browser automation for coding agents via accessibility snapshots
• Tavily: Web search for agents
• MCP: Our own remote MCP server (OAuth 2.1, also shipped as an MCPB bundle), plus customer-supplied MCP servers for actors during runs
• Agent Skills: Published from our site at /.well-known/agent-skills and in stuntkit

Claude Code Setup

MCP connectors

Connected to Claude Code and Claude across the team:

Connector	Used for
Stunt Double	Actors, checklists, interviews, workflows, feedback and the Stunt Double Index, run against our own product
GitHub	Repos, PRs, reviews and CI
Linear	Issues, projects, cycles and docs
Vercel	Deployments, logs, env vars, flags and analytics
Supabase	Database, migrations, branches, type generation and advisors
Cloudflare Developer Platform	Workers, D1, KV, R2 and Hyperdrive
Figma	Design context, Code Connect, diagrams and generation
Graphify	Code graph search, call graphs and change impact across our repos
Stripe	Billing, products and analytics
Resend	Email, broadcasts, templates and inboxes
Slack	Messages, threads and canvases
Attio	CRM, notes, meetings and pipeline

Skills

• Figma skills: figma-use, figma-generate-design, figma-generate-library, figma-code-connect, figma-design-to-code, figma-generate-diagram
• Supabase agent skills: npx skills add supabase/agent-skills
• Stunt Double skills: stunt-double (npx skills add stunt-double/stuntdouble-mcp), plus stunt-double-wao, stunt-double-browser-toolset and stunt-double-spelling in stuntkit
• Built in: /code-review, /security-review, /simplify, /init, /loop and /run

Mods

• Switchboard: Claude Code mod for per-prompt model triage, a peer-session inbox and /send, installed from this repo's plugin marketplace

Open Source

• stuntkit: Our open source packages
  • @stunt-double/browser-toolset: Browser tools for AI agents over a provider-neutral driver, including an executor for Anthropic's browser-use toolset
  • @stunt-double/wao: Web Agent Optimiser, a drop-in script that repairs page semantics so AI agents can read them
  • @stunt-double/spelling: US, UK and Canadian spelling localisation
  • @stunt-double/icons: The Continuity icon pack

Payments and Email

• Stripe: Payments and subscriptions
• Resend: Transactional and marketing email
• React Email: Email templates
• Svix: Webhook verification
• postal-mime: Inbound email parsing on Workers
• Web Push: Browser and iOS notifications

Observability

• Vercel Analytics: Web analytics
• Vercel Speed Insights: Core Web Vitals
• Vercel Flags: Feature flags via the Flags SDK
• OpenTelemetry: Tracing via @vercel/otel and AI SDK telemetry
• rrweb: Session recording and replay of actor runs

Security and Networking

• Cloudflare Zero Trust: Domain access and private VPN (free up to 50 users)
• OAuth 2.0: Sign-in with Apple, Google, Figma and GitHub
• Vercel BotID: Bot protection
• OAuth 2.1 + PKCE: For our MCP server and agent connections

Productivity

• Raycast: Clipboard history, snippets, quicklinks and window layouts
• Apple Notes: Notes and quick capture
• Bartender: Menu bar organisation
• BetterDisplay: Display scaling and HiDPI control
• Vorssaint: Open source macOS menu bar utility suite