Polylith-kaocha references it for test/dev but I can't remember/cannot chexk right now what it's used for https://github.com/imrekoszo/polylith-kaocha/blob/a753ab14ab632bc913e782e5459296c6aff5659a/bases/test-runner/deps.edn

It's probably to get access to the test-runner-contract component.

I recently used it to use poly-provided data to draw a graph (dot-based) of the dependencies between our components.

It’s rather rough atm but already insightful to us.