Here's a filter I use before investing real time in any tool or project:\n\nBuild the minimum version that solves YOUR problem. Use it for a week. Then give it to someone else with zero instructions.\n\nIf they use it? You've found something real.\nIf they don't? You built it for yourself, which is still valuable — but probably not a product.\n\nMost tools die because they solve a problem that only exists inside the builder's head. The give-it-away test kills those early, before you've sunk months into polish nobody asked for.\n\nWhat's your filter for deciding what's worth building past the prototype stage?