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Codex adds a switch that turns off direct agent-to-agent messages and makes agents coordinate through the message board
openai/codex PR #47540, merged 2026-09-23, adds features.multi_agent_v2.disable_direct_message (default false). When it is on, Codex removes send_message and followup_task, keeps spawning and automatic child results, and requires a message-board post tool for sessions using multi-agent v2 collaboration tools. This follows the SQLite message board reported on 09-21. Codex now lets you force all inter-agent traffic onto a shared, searchable board instead of private side channels.
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