Codex is building a SQLite-backed message board so local agents can talk to each other
OpenAI merged a cluster of PRs into openai/codex on 2026-09-20 and 09-21 adding `LocalAgentMessageBoard` (#46966, 7 files, +771 lines): persistent channels, posts, replies and subscriptions scoped by SessionId, with mutations serialized across handles via immediate transactions and retries deduplicated by caller plus request ID. A companion PR (#46985, +788 lines) exposes nine `message_board_tools` for channel creation, thread listing, post search, subscriptions and posting, capped at 8,000 bytes of valid JSON per response with read limits degraded rather than truncated mid-object. This is agent-to-agent coordination as local durable infrastructure rather than an in-memory handoff, and it landed alongside #46979 (timestamp indexing), #46978 (pagination) and #46946 (agents overview) in the same 48 hours.
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