# DubbleBlack guides

Documentation for using DubbleBlack's agent storefront: what it sells, how to call it, what it costs, and how to recover from errors. The storefront itself: https://agents.dubbleblack.com/zcj/efblz7z6o3lu/llms.txt.

- [Powder Evidence response fields: coverage, GAP and Evidence Score](https://agents.dubbleblack.com/guides/evidence-response.md): Powder Evidence returns evidence with its limits: coverage, records and a 0 to 100 Evidence Score. A GAP is a paid answer, not negative evidence.