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You can now update the tools in an existing session in the Agents API public beta

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You can now update the tools in an existing session in the Agents API public beta. Updates replace the full tool list. Function tools and MCP servers change on the next model call; built-in tools change by the next turn. Context compaction now runs in the background by default. Set compaction.async to false for blocking compaction.

AI agentsMCPDeveloper tools

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Also shipped Oct 30, 2026OpenAI in October 2026 →

More from OpenAI APIEvery OpenAI API release →

Added automatic review for eligible Agents API projects

Added automatic review for eligible Agents API projects. Set the session's review field to "auto_review" to have a model approve or deny supported tool and permission requests based on conversation intent and risk. See the automatic review guide for supported requests, limitations, and additional token billing.

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