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Show HN: 1ShotGen – From rough idea to full build prompt in 1 shot

1ShotGen is a tool that takes a rough idea and turns it into a structured build prompt for coding agents like Cursor, Claude Code, or Copilot. It helps users clarify their intent upfront by pulling out missing details, constraints, and edge cases, aiming to reduce back-and-forth guessing and let the agent complete the task in one shot.

Background

- This is a Show HN post — a tradition on Hacker News where makers share side projects or new tools they've built for community feedback. - The creator describes a common frustration with AI coding agents (tools like Cursor, Claude Code, GitHub Copilot that generate or edit code from natural language prompts). The typical workflow involves multiple back-and-forth rounds: the developer gives a vague prompt, the AI builds something off-target, and they spend several exchanges correcting it. - 1ShotGen is a prompt-engineering helper — it doesn't write code itself. Instead, it interviews the user to refine a rough idea into a detailed, structured prompt that an AI coding agent can execute in a single shot. The pitch is that most "bad" AI builds are caused by under-specified initial instructions. - The tool is marketed as complementary to existing AI coding subscriptions (max/pro plans), encouraging users to make better use of tokens they're already paying for.

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