Tripwire
A guardrail signal that halts or blocks an agent run when input, output, or a tool action fails a policy check.
Plain English
It is the red wire that stops the workflow before the risky action continues.
Example
A guardrail detects a request for disallowed financial advice and triggers a tripwire before the final answer is sent.
Why it matters
Tripwires make safety logic explicit, observable, and testable in agent systems.