AI Blocks › Test an idea before you build it
Know which guess could sink your plan, and the cheapest way to test it
Paste your plan. Get the guesses it rests on as numbers, the smallest test for the riskiest and pass lines set first.
Find the riskiest guess in your plan and test it is a free AI workflow for the job "Test an idea before you build it". It guides your AI through several skills in order, passing each step's output to the next.
Free · No account · Made by AI Blocks · Thinking: high
What it does
Most plans are mostly routine, with a few bets hidden inside lines like "it worked for them, so it will work for us". Teams spend months on the routine part and meet the bet last, when it is costly to be wrong. This workflow follows the method Eric Ries teaches in The Lean Startup. It pulls the bets out and writes each as a plain sentence with a number. It ranks them by damage if wrong and how little you know. It then picks the smallest form of test for the top bet, from a sign-up page to doing the work by hand for one customer, and sets pass, fail and in-between numbers before the test runs.
You give it
- Your plan (what you make, for whom, how they find it and what you expect back)
- Your biggest worry (optional)
- What you can spend and who you can reach this week (optional)
You get
- The guesses your plan rests on, each with a number, ranked, with the riskiest named
- The cheapest kind of test for the top guess, who to try it on and what to leave out
- Pass, fail and in-between numbers set before the run
- A run plan and a rule for what to do on a pass, a fail or a middle result
Use it when
- You have a plan and sense that part of it is a bet, but cannot say which part.
- You are about to spend months building and want proof of the shakiest part first.
- Your last test left you with praise and no facts.
Steps
- Startup assumption checker: Paste your plan. Get the few guesses it stands on, each with a number, ranked so you test the riskiest first.
- Minimum experiment planner: Paste your ranked guesses. Get the cheapest test for the top one, who to try it on and what to cut.
- MVP experiment planner: Paste your product idea. Get the riskiest guess, the smallest test and a pivot or persevere rule.
How to use it
- Download the handoff pack. It's a zip with HANDOFF.md and every skill file this workflow uses.
- Give the folder to Claude (in Claude Code, or as files in a Claude Project) and say "Follow HANDOFF.md".
- Paste your plan as it stands, comparisons and all. Say what worries you most.
- Agree the pass numbers before you run the test, then bring back the results.