
OpenAI Agents SDK Guardrails: Block Bad Input Fast
Summary
Use input guardrails and tripwires to stop bad input before your costly OpenAI agent runs.
Your customer-support agent runs on a smart, slow, expensive model. A user pastes in their math homework, or tries a prompt-injection, and you pay full token price to answer something you never wanted to answer. Guardrails in the OpenAI Agents SDK fix this: a cheap, fast check screens input and output, and a tripwire halts the run the moment something looks wrong.
This guide shows you how to add input, output, and tool guardrails in Python — and the one setting (run_in_parallel=False) that decides whether you actually save money or just fail after the bill is already racked up.
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