Confidence ceilings
LexSona-style constraints can cap how assertive a response should be when memory is offline or evidence is thin.
Control Deck
Uncertainty should be a first-class output.
Good agent tooling makes missing context, low confidence, blocked access, and unsupported assumptions visible before they become silent errors.
Guardrail patterns
Recoverable failures
Lex and AXF should return structured errors that tell the agent what to inspect, install, request, or retry.
Authority denials
LexThority should explain whether a denial came from scope, missing credential, missing approval, or forbidden effect.
Handoff Frames
When work stops, Lex should preserve the next action and blocker so the next run does not invent state.
Working rule
An agent that can say exactly what it does not know is safer and more useful than an agent that smooths over missing context.