Module obs 

Observability. The default build ships three dependency-free things: a hand-rolled JSON-lines logger to stderr, a tiny health surface, and W3C trace-context propagation. Only the heavier surfaces (metrics, OTLP export) are feature-gated. RFC 0010.

Invariant: stdout is the agent’s result; stderr is all telemetry.

Modules

health

Health / liveness. RFC 0010 §health; RFC 0016 §10 (the fleet-liveness contract reading).

log

Hand-rolled JSON-lines logger. ~150 lines reusing the serde_json serializer — deliberately not tracing (its implicit async span context is moot for a processes-plus-threads design, and the process tree gives us correlation for free). RFC 0010 §default-logging.

metrics

Process-local counters → Prometheus text. RFC 0010 §metrics. [feature: metrics]

otel

OTLP span export with the GenAI semantic conventions. RFC 0010. [feature: otel]

trace

W3C Trace Context propagation. RFC 0010 §context-propagation.