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Public story · 2026-08-05 · high
A point release landed one day after 0.19.3, closing four ordering races between guardrails and session handling.
Why now: The fix landed August 5, one day after 0.19.3, the release it directly follows up.
OpenAI shipped 17 fixes to its Agents SDK on August 5, one day after version 0.19.3, per the release notes on GitHub.
Invalid tool-call arguments used to echo straight into error logs, meaning attacker-controlled arguments could land in your logs unredacted. Version 0.19.4 fixes that.
Anyone running the SDK with output guardrails and logging on should pull this patch before the next deploy.
Four other fixes untangle races between guardrails and session handling, the kind of bug that only shows up under real concurrent load.
The SDK now defers non-streaming session saves until output guardrails finish running, so a session can't get persisted before it's actually been checked. It also preserves completed tool guardrail results instead of discarding them mid-run.
It honors a request's resolved status before running policy checks. And it cancels sibling tasks after a concurrent failure, instead of letting them keep executing.
Landing this many ordering fixes a single day after 0.19.3 reads like OpenAI found these guardrail-session races in production, not in a review pass.
0.19.4 shipped less than 24 hours after 0.19.3, so if you're already running the SDK, you're likely still on the version with the logging gap.
Each link below shares sources, entities, or timing with this story.
OpenAI released OpenAI Agents SDK / Shared entity: Released August / Same source domain / Shared topic / Earlier coverage
Linked by a graph relationship (OpenAI released OpenAI Agents SDK); both cover Released August; reported by the same outlet (github.com).
OpenAI released OpenAI Agents SDK / Same source domain / Shared topic
Linked by a graph relationship (OpenAI released OpenAI Agents SDK); reported by the same outlet (github.com); overlapping topics (agent, argument, tool).
Linked by a graph relationship (OpenAI released OpenAI Agents SDK); reported by the same outlet (github.com); overlapping topics (agent, between).
Linked by a graph relationship (OpenAI released OpenAI Agents SDK); reported by the same outlet (github.com); overlapping topics (agent, between).
Linked by a graph relationship (OpenAI released OpenAI Agents SDK); reported by the same outlet (github.com); overlapping topics (agent, between).
OpenAI released OpenAI Agents SDK / Shared entity: OpenAI Agents SDK / Earlier coverage
Linked by a graph relationship (OpenAI released OpenAI Agents SDK); both cover OpenAI Agents SDK; earlier OpenAI Agents SDK coverage from 2026-06-29.
OpenAI released OpenAI Agents SDK / Shared topic / Tension
Linked by a graph relationship (OpenAI released OpenAI Agents SDK); overlapping topics (agent, tool); pushes against this story (against).
Linked by a graph relationship (OpenAI released OpenAI Agents SDK); overlapping topics (agent, tool); pushes against this story (but).