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PR #6652 added SkillUsedEvent but deliberately shipped no listener wiring, so the event reached no collector. The trace listener subscribed to the five setup events -- discovery, load, activation, failure -- and none of them can answer the question skills observability is for: activation is idempotent and fires once at setup, so an agent using a skill across twenty turns produces exactly one event. SkillUsedEvent is the only runtime signal and the only one that re-fires per execution. Subscribing to it lets a trace attribute skill usage to an agent and a task. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>