Evaluate AI code with Logfire How This Works Python's and Node.js's run a task against cases, apply evaluators, and return a report. An active Logfire or OpenTelemetry provider may export inputs and outputs even if this skill did not configure it. Intentional upload needs in Python or a configured Node.js exporter. Span-based evaluators inspect the task's OpenTelemetry span tree. Without working Logfire instrumentation, Python reports "No span tree available"; Node.js can produce no evaluator result at all. Treat either signal as a setup failure, not evidence about the agent. Step 1: Check fo…