Drop evalkit.init() into your app. Every provider — OpenAI, Anthropic, Gemini, Bedrock — is patched automatically. No per-call wiring. Six milliseconds of p99 overhead.
Every prompt, completion, tool call, DB query and HTTP hop becomes a W3C-compatible span — streamed to ingest in flight. Multi-agent waterfalls stitch themselves under one root.
Latency, cost, error rate, model mix — per environment, per session, per device. The trace tree becomes a panel you can read at a glance and ship against by 4 p.m.
Spin up synthetic personas — happy-path, edge-case, adversarial, voice. The pipeline forks into a grid of runs. Each one is a real trace; each one gets scored.
Online judges orbit each span — groundedness, safety, relevancy, custom rules. The sphere stays lit or it doesn't. Regressions land in your inbox before the deploy reaches users.
One SDK call everything traced.