Phoenix Client Development TypeScript SDK for Phoenix AI observability: datasets, experiments, prompts, sessions, spans, traces. Read existing code in the directory you're working in before writing new code. Rule Files | Rule file | When to read | | ---------------------- | --------------------------------------------------------- | | | Experiment execution, task runners, evaluator wiring | | | OpenTelemetry tracer providers, span export, global state | | | Unit tests, integration tests, test fixtures | Build and Test Tests use vitest . Test files live in named . ---