ButterKit

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Ship App Store screenshots from your AI coding agent: generate, localize to all 50 App Store languages, and upload to App Store Connect

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Unknown
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Developer Tools, Other, Media, Marketing

ButterKit exposes aModel Context Protocol(MCP) server that lets AI agents control ButterKit programmatically. Use natural language in tools like Cursor, Claude Code, or OpenAI Codex to:

- Design screenshots from a prompt.Describe the look you want and let the agent create artboards, apply templates, set text, and configure 3D devices.
- Localize in bulk.Add languages and translate all screenshots and App Store metadata in a single command.
- Automate your release pipeline.Wire ButterKit into your CI/build process so screenshots update, translate, and upload to App Store Connect without manual work.
- Iterate fast.Ask for design tweaks, swap copy, preview renders, and export, all from your editor or terminal.

- ButterKit v1.8 or later must be runningwith at least one document open.
- MCP must be enabledinButterKit > Settings > MCP.
- No extra installation needed.ButterKit has an MCP bridge atButterKit.app/Contents/MacOS/butterkit-mcp. When setting up your AI tool, you’ll point it to this path so it can communicate with ButterKit.

Your AI tool connects to ButterKit through the MCP connector utility and gains access to 42 tools across 5 namespaces:Document,Design,Export,Localization, andApp Store Connect. You describe what you want in natural language, and the AI agent calls the right tools automatically.

- Tool Reference(all 40 tools)
-
Workflows(step-by-step recipes)

By default, thebutterkit-mcphelper exits silently if ButterKit isn’t running. This means opening your AI tool won’t unexpectedly launch ButterKit in the background.

If you’d prefer ButterKit to start automatically whenever your agent needs it, add--auto-launchto your MCP config:

{ "mcpServers": { "butterkit": { "command": "/Applications/ButterKit.app/Contents/MacOS/butterkit-mcp", "args": ["--auto-launch"] } } }

With this flag, the helper will open ButterKit and wait for it to become available before connecting. Without it, you just need to make sure ButterKit is already running before using MCP tools.

- The MCP server renders artboards using ButterKit’s RealityKit engine. The app window does not need to be focused, but the app must be running.
- All IDs (documentId,artboardId,templateId, etc.) are obtained from the corresponding list tools.
- Language codes follow ISO 639-1 (e.g."en","es","ja"). App Store Connect locale codes follow Apple’s format (e.g."en-US","fr-FR").

Development builds:If you’re running a dev build from Xcode, replace/Applications/ButterKit.appwith the path to your DerivedData build, e.g.~/Library/Developer/Xcode/DerivedData/ButterKit-*/Build/Products/Debug/ButterKit.app.

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