Cinder is the observability layer for AI-native backends. Trace model calls, tool invocations and the services around them in one timeline.https://cathode.sandbox.koalastudio.dev/en-ushttps://cathode.sandbox.koalastudio.dev/blog/what-a-trace-should-tell-you/https://cathode.sandbox.koalastudio.dev/blog/what-a-trace-should-tell-you/Most agent traces record what happened. The useful ones record what was decided, and on what evidence. Here is the difference, in spans.Tue, 14 Jul 2026 00:00:00 GMThttps://cathode.sandbox.koalastudio.dev/blog/sampling-without-losing-the-incident/https://cathode.sandbox.koalastudio.dev/blog/sampling-without-losing-the-incident/Head-based sampling drops the traces you needed. Tail-based sampling costs what you were trying to save. We ended up somewhere in between, and the details matter.Tue, 23 Jun 2026 00:00:00 GMThttps://cathode.sandbox.koalastudio.dev/blog/model-graded-evals-are-still-evals/https://cathode.sandbox.koalastudio.dev/blog/model-graded-evals-are-still-evals/If a model is grading your output, the grader is a dependency with a version, a failure mode and a drift profile. Treat it like one.Thu, 28 May 2026 00:00:00 GMT