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Architecture
8 min
March 27, 2026

Warrants vs Guardrails: A Better Model for AI Agent Control


The Problem with Reactive AI Safety


Imagine you're designing security for a bank vault. Would you put the security system after people have already entered the vault and taken the money? Of course not. You'd require authorization before they can enter.


Yet this is exactly how most AI safety systems work today. They operate reactively—filtering outputs after AI models have already made decisions, rather than governing actions before they're executed.


Guardrails: The Current Approach


Most AI safety implementations today follow the guardrails model:


AI Model → Output Generation → Safety Filter → Approved Output


This works well for content-focused applications, but has critical weaknesses when applied to autonomous agents:


Timing Problems

Guardrails operate after the AI has already decided what to do. For autonomous agents, this is often too late.


Execution vs. Content

Guardrails filter what AI systems can say. But autonomous agents need governance over what they can do.


Execution Warrants: A Proactive Model


Instead of filtering outputs, execution warrants govern actions at the intent level:


Agent Intent → Risk Assessment → Approval → Signed Warrant → Execution


Every approved action receives a cryptographically signed warrant with:

  • **Scope**: Exactly what the agent is authorized to do
  • **Time limits**: When the warrant expires
  • **Constraints**: Parameter bounds the execution must respect
  • **Audit trail**: Complete record of approval chain

  • Real-World Example


    Scenario: AI agent wants to scale database cluster


    Guardrails approach:

  • Agent executes scaling
  • System monitors outputs
  • Too late to prevent $20K/month cost impact

  • Warrant approach:

  • Agent submits scaling intent
  • System evaluates cost impact ($20K/month)
  • Routes to DevOps team for approval
  • Team reviews and denies (temporary traffic spike)
  • No scaling, no unnecessary cost

  • Why Warrants Work


    1. Proactive control: Stop problems before they happen

    2. Risk-aware: Different approval flows for different risk levels

    3. Cryptographically verifiable: Tamper-evident audit trails

    4. Time-limited: Warrants expire, preventing stale authorizations

    5. Scope-constrained: Agents can only do exactly what's approved




    Learn how to implement execution warrants in your systems. Read the docs →


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