During the week the market runs, and the idea that came to you at the chart midweek gets buried between trades. It ends up on a note. On Friday the market closes, and the idea is still waiting.
Today is Saturday. Prices stand still, your head is clear, and that is exactly what your idea needs now.
On BuildYourTools you describe it in your own words, ideally with a screenshot of the chart where it came to you. The AI asks about every detail and suggests answers. Then you see your tool as a prototype on the chart. You only pay once you order the build.
When the market opens on Monday, your own tool runs on your chart, as a finished .ex5 file in your MetaTrader 5.