Agent observability

Agent observability captures what an agent actually did: each model request, tool call, input, and output, plus latency and cost. Without it, a misbehaving agent in production is a black box.

Beyond tracing, mature observability adds prompt versioning, regression detection, and alerting on quality or cost drift — turning incidents into data you can act on.

It pairs naturally with evals: observability surfaces real-world failures, and those failures become new eval cases.