Fleet Behavioral Monitoring

The FleetBehavioralMonitor detects multi-agent drift patterns that no single-agent monitor can see. It sits above individual agent monitoring and detects three drift scopes:

• Fleet drift: The fleet's aggregate behavioral distribution shifts even when no individual agent triggers an alert.

• Correlated drift: Multiple agents drift in the same direction within the same time window, suggesting a shared upstream cause.

• Coordinated drift: Drift propagates through an agent interaction chain, with potential amplification at each hop.

For full details on drift scopes, detection algorithms, and configuration, see the Fleet Drift Scopes feature documentation.

Policy Coordination

When the fleet monitor detects coordinated or correlated drift and the policy optimizer is enabled, the system automatically evaluates cross-agent intervention strategies via FleetBehavioralMonitor.on_alert_with_policy_coordination().

• Coordinated drift alerts trigger PolicyOptimizer.optimize_chain(), which evaluates intervening at the root of a propagation chain rather than on each agent independently.

• Correlated drift alerts trigger PolicyOptimizer.optimize_correlated(), which compares fixing the shared upstream cause against independent per-agent intervention.

Fleet-scope alerts (aggregate distribution shift) do not trigger policy coordination.

For the optimization algorithms, cost modeling, and worked examples, see Sequential Optimization — Multi-Agent Policy Coordination.