OpenAI Agents SDK 0.21.1 lets Docker sandboxes disable networking entirely and adds run-scoped sandbox working directories

GitHub (openai/openai-agents-python)·medium signalXBlueskyLinkedInCopy link

Released Aug 16, 2026, one day after 0.21.0, v0.21.1 adds model call timeouts (#4428), run-scoped sandbox working directories (#4427), the ability to disable networking on Docker sandboxes (#4452), and Modal sandbox resource options (#4455). It also fixes the core honoring exact call-approval decisions (#4447) and rejecting partially matched stacked anchors (#4431). The sandbox work is the through-line: OpenAI is hardening the execution boundary of its own SDK in the same week Hazmat shipped for the same problem at the OS level.