Observable symptom: Reflection loops never converge. Recursion limits trip at runtime instead of design time. Suitable correction: Schema-validate router decisions. Hard recursion_limit , hard max_handoffs .
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Hallucinated routing occurs when a multi-agent system assumes a nonexistent or unsuitable agent path and builds on it.
The pattern is described as an anti-pattern in the analysis of multi-agent systems. It arises from unverified assumptions about roles, capabilities, or reachable agents rather than a checked topology.
An agent chooses a recipient for a task. Without checking the actual route, it may select a plausible but invalid recipient. The chain then produces errors, loops, or seemingly reasoned results. An explicit agent registry, capability metadata, and handoff protocol make the path testable.
An agent treats a presumed role or capability as available without checking it at runtime.
Topology records which agents exist, are reachable, and may receive a handoff.
Registries, capability checks, and protocols prevent invalid or unbounded handoffs.
The pattern matters for reliability, debugging, and security in agentic systems. Make handoffs observable and handle failures explicitly instead of treating plausible agent output as proof of correct routing.
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