Prebuild Desk - find the assumption that sinks it before you build

Paste the brief for the MVP, feature, landing page, internal tool or agent workflow you are about to build. Free in your browser: the brief checked against seven risks (demand, positioning, monetization, retention, trust, distribution, feature adoption) with the evidence it carries line by line, the claims standing in for evidence, and an evidence floor. Then a pre-mortem review names the main assumption, the evidence to get first, the next step and what to delay, and a test plan turns it into a go/stop test with a ready-to-send asset. Derived from the agent skill @wshobson/before-you-build by Seth Hobson (wshobson/agents, MIT).

Every public app is built from a security-scanned skill and must pass a clean scan — skill and frontend — before it can be listed. Have a skill of your own? Turn it into an app — or read the step-by-step walkthrough.