Product Idea Stress Test: find the assumption most likely to kill your idea
Turns a product or startup idea into testable claims, researches evidence for and against, names the single assumption most likely to change the decision, and proposes the cheapest next experiment. Based on Hiten Shah's Grok Bot marketplace bot.
Best for Founders and indie makers deciding whether an idea deserves another month of work
Hiten Shah published Product Idea Stress Test on the Grok Bot marketplace. It treats an idea as a set of claims that can be wrong, looks for evidence on both sides, and then names the Bottleneck Belief: the one assumption most likely to change whether you should keep going.
The prompt here is my own condensed version of that method. It asks at most three questions, researches competitors, pricing and real complaints, rates the evidence, and ends with a concrete next experiment and a decision on how much to invest before checking again.
It is useful before building anything, and again after the first users show up, when the bottleneck has usually moved.
On the Grok Bot marketplace
Add it in one click: the button opens Grok Bot with this bot ready to install. No app yet? The page shows how to get it.
Questions
What is a Bottleneck Belief?
The single uncertainty with the most power to change your decision, for example whether a specific type of customer will pay at all. The next experiment is chosen to test it.
Does it need any connectors?
No. It uses Grok Bot's web search for evidence. You can add notes or interview transcripts in the chat for better results.
Is this Hiten Shah's original prompt?
No. You can import his bot from the marketplace link. This prompt is a shorter version written from scratch around the same method.
Will it just tell me my idea is good?
It is told not to encourage or discourage, only to weigh evidence and say when evidence is missing.
Can I use it for features, not just startups?
Yes. Describe the feature, who it is for and what you want it to change, and it runs the same steps.