The original headline is: "OpenAI Agents SDK 0.13 to 0.17: Three Breaking Changes You Will Hit"

Short summary

OpenAI's Agents SDK (0.13→0.17) introduced three breaking changes: model refusals now raise exceptions, the default model switched from GPT-4.1 to GPT-5.4-mini, and Sandbox Agents enforce path security. All three can silently break production agents without error at upgrade time. The guide provides a migration checklist and safe upgrade pattern with explicit model pinning and refusal handlers.

• •Model refusals raise exceptions; add error handlers to avoid crashes
• •Default model switched from GPT-4.1 to GPT-5.4-mini with different quality/token tradeoffs
• •Sandbox Agents now enforce path security restrictions; use path grants or restructure files

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