A PM in your prompt: idea validation before the first line of code

What it does

vibe-check is a skill—a structured system prompt—for Claude Code, Codex, and similar agents that guides complete beginners from a vague app idea to a validated, buildable blueprint. It runs a full product-discovery loop: mining Reddit for pain points, scoring opportunities with ODI lenses, mapping user flows, and selecting a tech stack, then outputs an interactive HTML PRD and a markdown build plan. The stated goal is to make sure you’re building the right thing before the AI starts building anything at all.

The interesting bit

Most AI coding skills assume you already know what you want; this one treats “I have an app idea” as a hypothesis that needs interrogating. It includes a Checkup Mode for when your vibe-coded mess gets scary to touch, and it explicitly hunts for a viral growth loop so your app isn’t entirely dependent on you dragging in users by hand.

Key highlights

• Three entry points: full journey, validate-only, or jump straight to planning if you already did the research
• Produces an interactive, self-contained HTML PRD with live boards and a markdown instruction manual for the AI
• Teaches GitHub basics, commit/push/deploy hygiene, and secret-key safety in plain language during the build
• Includes a Checkup Mode to safely audit and tidy messy, grown codebases without breaking things
• The ClearList app is presented as a real product built from a vibe-check session

Caveats

• The author is upfront that this is his day job compressed into a prompt, and the repository doubles as a billboard for paid Fiverr audits
• It is not a standalone app; you need a compatible AI coding tool to load the skill
• The example transcripts are long and dense if you want a quick taste rather than the full back-and-forth

Verdict

Grab this if you’re a non-coder with an app idea or a vibe-coder who keeps building things nobody asked for; skip it if you already have validated research and just want to optimize your prompts for raw speed.