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Fail-Closed Agent Architecture: Governed AI Systems

Autonomous agents that execute side-effects (moving money, booking clinical appointments, sending emails) without deterministic permission gates are an operational catastrophe. Here is the fail-closed pattern our products follow.

The Moment team2 min read

The Principle of Fail-Closed AI

In standard network security, a firewall is fail-closed: if a rule does not explicitly permit a packet, the packet is dropped. In AI agent orchestration, the same principle must apply to tool execution:

  • Draft vs Ship Isolation: The LLM is permitted to synthesize, reason, and draft actions inside a sandbox. It has zero network access to production endpoints.
  • Receipts: Every proposed state change is recorded with its parameters, so a person can review it.
  • Deterministic Gatekeeper: The transition from draft to production requires an explicit human approval.
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