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Codex Review: Didn't find any major issues. Bravo. ℹ️ About Codex in GitHubYour team has set up Codex to review pull requests in this repo. Reviews are triggered when you
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Why
Follow-up to #25722. Startup prewarm builds a preview
TurnContextbefore the first real turn so it can precompute the initial prompt and tool surface. After the per-thread runtime work landed, that preview path still recomputed multi-agent mode frommodel_infoand feature defaults instead of reusing the runtime the session had already resolved from persisted metadata or inheritance.That could leave the prewarmed session primed for a different multi-agent mode than the first real turn, which is especially risky because collaboration tool exposure depends on
turn_context.multi_agent_version.What changed
TurnMultiAgentRuntime::Previewpath, preferSession::multi_agent_version()when it is already known.model_info.multi_agent_versionand feature defaults when the session has not resolved a runtime yet.Testing