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Observer Plugins

Observers watch system activity without affecting behavior. They’re useful for debugging, auditing, and persisting reasoning traces.

Available Observers

PluginIDPurpose
Thinking Persistencenexus.observe.thinkingPersists thinking steps and plan progress
OpenTelemetrynexus.observe.otelExports events as OTel traces via OTLP

The legacy nexus.observe.logger plugin was removed in #66 / Phase 3. Its events.jsonl role is now subsumed by the always-on engine journal at <session>/journal/events.jsonl. External tooling that previously tailed the logger’s events.jsonl can tail the journal instead.