DEFINITION
The fourth tier of the Agentic Tier framework: AI initiates work, takes actions across systems within guardrails, and decides what to escalate; lawyers review exception flags and end-of-period summaries rather than per-execution outcomes. Requires a delegation-authority register with board sign-off, continuous audit trail, and materiality calibration; Tier 4 with weak Defensibility is operationally uninsurable.
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