Every agent's output is validated against expected schema, value ranges, and completeness criteria before being passed to downstream agents.

When an agent produces anomalous output or becomes unavailable, a circuit breaker stops passing requests to it and routes to a fallback — preventing further propagation and retry storms.

When a primary agent fails, the pipeline falls back to simpler, safer behavior rather than failing completely or propagating the error downstream.

Failed requests are retried with increasing delays and randomized timing — preventing thundering herd patterns that extend outages when dependencies recover.

Resource pools (connections, threads, memory) are partitioned per agent so that one agent's resource exhaustion cannot starve other agents that share the same infrastructure.

High-volume or irreversible terminal actions (bulk emails, transfers, deletions) require human confirmation or are rate-limited — preventing a cascaded error from executing at full scale before detection.

Actions are designed so that executing them multiple times produces the same result as executing them once — making retry-driven duplicates harmless.

Each agent's output volume, latency, error rate, and value distributions are monitored independently so that anomalies are detected before they propagate far downstream.

Deliberate failure injection into the pipeline in controlled conditions — verifying that circuit breakers, fallbacks, and isolation mechanisms work as designed before production failures occur.