OpenAI Agents SDK 0.22.1 adds server-wide guardrails on MCP tools and configurable Unix-local sandbox isolation

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Released 2026-09-08T09:18Z, v0.22.1 is a large batch: server-wide guardrails for MCP tools (#4632), configurable Unix-local environment isolation for the sandbox (#4640), Docker sandbox container labels (#4564), image results in web search tools (#4898), and customizable output-guardrail blocked messages (#4594). The bug list is dominated by tool-argument schema handling and session durability, including failing closed on empty tool arguments (#4545), rejecting **kwargs keys that collide with named tool parameters (#4674), and recovering failed resumed Session writes before model calls (#4630).