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Docs: build running apps with AI agents

Learn Prototyper: build a running app from a prompt in five minutes, connect Claude Code, Codex, Cursor or another MCP client, and share a live link.

Prototyper is a workspace where AI agents build real, running React apps. You describe what you want, in the built-in chat or from your own coding agent (Claude Code, Codex, Cursor or another MCP client) over MCP. The agent writes the code and runs it live next to your conversation, and you share the result with a link. Start with the five-minute quickstart, then connect your own agent and use the guides to get better results from every prompt.

Getting started

Quickstart: your first prototype in 5 minutesSign up, describe an app and watch the agent build it as real running code. Then connect Claude Code, Codex, Cursor or another MCP client, and share a link.Connect your own agentConnect Claude Code, Codex, Cursor or another MCP client to Prototyper in one step, and build on the agent subscription you already pay for.

Guides

Be clear and directWrite prompts the Prototyper agent can't misread: give it context, say exactly what you want and list the steps, with before-and-after examples.Writing good promptsPlan before you prompt, build by component, use real content, and apply design buzzwords to get consistent, high-quality results.Use XML tagsStructure longer prompts with XML tags, so the Prototyper agent keeps your requirements, style rules and examples apart and follows each one.Prompt enhancerUse Prototyper's prompt enhancer: select Enhance and it rewrites a rough request into a clear, structured prompt that you review before you send it.Debugging promptsUse structured prompts to investigate errors, run codebase audits, handle fragile updates safely, and resolve persistent issues systematically.Advanced debugging promptsPrompts for heavy debugging in Prototyper: audit the whole codebase, make fragile changes safely, find performance problems and break out of repeating errors.Debugging templatesCopy-paste prompt templates for debugging in Prototyper: error loops, features that misbehave, vanished UI, console errors and starting over.