# tether > Check what an agent says it did against the output it did it with. Eval verdict: disproven. ## Docs - [How it works](https://tether.customer0.dev/docs/how-it-works.md) - [API](https://tether.customer0.dev/docs/api.md) - [Eval](https://tether.customer0.dev/docs/eval.md) - [Design](https://tether.customer0.dev/docs/design.md) - [Limits](https://tether.customer0.dev/docs/limits.md) ## Source - [GitHub](https://github.com/acoyfellow/tether)