AI Agent Observability: The 5 Signals That Matter for Production AI in 2026
AI agent observability is the structured visibility into what a production AI agent did at every step: which tools it called, with what arguments, with what results, in response to what reasoning, with what tokens consumed. It is the difference between 'the AI did something weird and we cannot debug it' and 'here is the step-by-step replay, here is the cause, here is the fix.' In 2026 with EU AI Act post-market monitoring obligations live for high-risk systems, observability is also a compliance requirement, not just an engineering preference. This guide walks through the 5 signals that matter (tool call traces, reasoning steps, source quotes per step, token-and-latency telemetry, anomaly detection), how each maps to compliance evidence, and the minimum observability stack a serious AI deployment needs in production.







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