VS Code extension that compiles structured prompts — no AI calls, no API keys

What I Built Pup is a VS Code extension that treats your prompt like source code — you fill a form, it compiles to whatever format your model prefers. The insight behind it: LLMs aren't all trained the same way, and the format of your prompt actually matters. Model Preferred Format Claude (Anthropic) XML tags GPT-4 / GPT-5 (OpenAI) Markdown or JSON Gemini (Google) Markdown or structured JSON Cursor / Copilot Chat Markdown Pup compiles the same prompt into all four. One toggle. No rewriting. How