Cerbos is the open core, language-agnostic, scalable authorization solution that makes user permissions and authorization simple to implement and manage.

Cerbos Community

Also, I find the playground tests unreliable - some cases that should be throwing an error pass. If I’m running the tests in that docker container, they do fail (as they should).

Okay, nevermind - after running them in the docker container, there were errors in the test (the playground didn’t detect them, I guess) - they were references to principals that didn’t exist, or were missing from the input

If you've saved the playground instance with the broken test, could you share a link with me? I'll have a look and see why the playground isn't reporting the errors