Guardrails Aren't Just About What Goes Into Your Agent

It's what comes in, what tools it calls, and what goes out. Three rules created on the Control Plane and blocking live — with zero guardrail code in the agent.

Aug 27, 2026 · Upendra Bhandari · Guardrails

Guardrails aren't just about what goes into your agent — it's what comes in, what tools it calls, and what goes out.

Watch all three rules get created on the FastAIAgent Enterprise Control Plane and then block live: financial advice at the input, delete_account before it ever executes, an internal codename before the reply leaves.

Zero guardrail code in the agent.

One agent, four checkpoints

Blocking or parallel at every position — regex, schema, classifier or LLM-judge, authored locally or on the plane.

The checkpoint that matters most is usually the tool call. An input filter stops a bad request and an output filter stops a bad answer, but only a check between the model and the tool can stop delete_account from actually running.

The longer argument is in Guardrails that actually block; the companion demo of a local guardrail blocking PII is in Guardrails that log violations are just dashboards. The platform view is on the Enterprise page.

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