Brainstorm Experiments Existing skill: what it does and how to install it

What it does. Structures a product idea and its assumptions, then proposes experiments such as prototype tests, fake doors, technical spikes, A/B tests, Wizard of Oz trials and behavioural surveys. For each experiment, it defines the assumption, method, metric and success threshold, with guidance on reducing production risk.

When to use it. For validating feature ideas and product assumptions in an existing product before committing engineering effort. It can use supplied PRDs, designs or assumption lists as context.