Why is there no warning before one agent's bad output poisons the rest of my pipeline?

Multi-agent systems fail at rates between 41% and 87%, with coordination breakdowns alone accounting for 37% of those failures, yet there is no observability layer that surfaces cascade risk before it propagates. Unlike microservices, where a latency spike in one service appears in APM dashboards before it takes down the others, a hallucinated or wrong output from one agent propagates silently until a downstream agent acts on it irreversibly. Emergent failure modes in multi-agent settings, including cascading hallucinations, inter-agent collusion, and information leakage, cannot be predicted from single-agent safety evaluations. The International AI Safety Report 2026 and the OWASP Agentic AI Top 10 published in December 2025 both flag cascade amplification as a first-class risk, and no production tooling targets it specifically.