/trace (bro)

All mechanics live in the bro CLI. This skill is policy only.

Prereq: bro on PATH or npx -y @broject/bro@0.

What it is

The hooks layer journals every post-tool event per session to <git-common>/bro/hooks/trace/<session>.jsonl. bro trace export pushes the unexported tail of those journals to an OTLP endpoint over OTLP/HTTP JSON (POST <endpoint>/v1/traces) — one trace per session, one span per journal line, journal fields as bro.* attributes. A cursor in trace/.export.json makes repeat exports send only the delta; span ids are content hashes, so resends dedup server-side.