OpenAI Agents SDK — AI Glossary

The OpenAI Agents SDK is OpenAI's official Python framework for building production-grade agents. Released in 2025 as the successor to the experimental Swarm prototype, it is built on the Responses API. The SDK exposes four primitives: agents (with instructions, tools, handoffs, and an output_type), tools (Python functions), handoffs (control transfer between agents), and guardrails (input/output validators).