Authority Leases and Concurrent Evidence Failure in Safe Agentic Execution

This bounded technical research note introduces authority leases for safe agentic execution: execution contracts that must still hold when a model, worker, tool, scheduler, or delegated automation acts. The note uses a frozen masked high-priority review set, fail-closed measurement checks, synthetic negative controls, and local diagnostic replay to describe a local class of action-time evidence-validity failures. It does not claim population-level probability, general failure rates, reviewer reliability, production validation, or customer outcome improvement. Core thesis: evidence is not action permission; decision-time evidence is not execution-time authority; true observation is not necessarily action-valid evidence.