You deployed an agent with proper access controls, a well-scoped system prompt, and it worked fine for months. Then a customer sent a link. The agent fetched it. The link contained instructions to leak data. The agent complied. Access controls didn't stop it because access controls don't verify intent - they only verify identity.
This is the core problem: agent behavior emerges from runtime context you don't control. Trusting an agent's decision because you trust its credentials is like trusting a person because you verified their ID. It misses what actually matters - not who is acting, but whether this specific action should happen now.
The shift required is architectural. Traditional security establishes a trust perimeter, verifies permissions once, then trusts all actions within that perimeter. Agents need the opposite: assume every decision is potentially compromised by untrusted context in the window, verify every tool call independently, scope every execution. No exceptions.
This means inserting a verification gateway between decision and execution. The agent proposes actions. A policy engine validates them against explicit rules. A context analyzer checks what influenced the decision. Only verified calls execute, and those execute with minimal credentials and resource limits. Every decision - approve or deny - is logged for audit.
The hard part isn't building the gateway. It's making verification cheap enough that teams actually use it. If verification is slow or expensive, production pressure creates shortcuts, and shortcuts become breaches.
Read the full architecture, implementation patterns, and how to scope tool execution properly:
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