Agent Guardrails
The checks and limits that keep an agent inside safe behavior even when it wants to wander.
Think of it like
The rails on a bowling lane — the ball can still curve, but it can’t end up in the neighbor’s gutter.
Example
A guardrail blocks the agent from ever calling the “delete customer” tool, and flags any output containing a credit card number before it’s sent.
How it actually works
Guardrails wrap the agent with independent checks — input filters, output validation, banned actions, rate limits — that don’t rely on the model behaving well. The key idea is that they sit outside the model, so a jailbroken or confused agent still hits the wall. They’re never perfect, and over-tight guardrails make agents useless, so the craft is blocking the catastrophic without smothering the helpful.
For product teams
Guardrails are what let you deploy an agent you don’t fully trust — invest in them before autonomy, not after.
For engineers
Independent pre- and post-checks around the model that validate inputs, outputs, and actions regardless of model behavior.
Related
- Scoped Access — One kind of guardrail — limiting what it can reach.
- Approval Gate — A human-approval guardrail on risky moves.
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