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Add an in-memory agent message board for ephemeral sessions - #47946
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copyberry[bot] merged 1 commit intoSep 24, 2026
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## Why Ephemeral sessions cannot use the SQLite-backed agent message board. An in-memory backend lets agents share discussions without creating durable board storage. ## What changed - Add the opt-in `message_board_in_memory` setting to the multi-agent v2 configuration, allowing the board to run in ephemeral sessions when both required features are enabled. - Share board state across agents in the same tree and release it when the last handle is dropped. - Implement channels, posts, subscriptions, notifications, search, and paginated reads through the existing `AgentMessageBoard` interface, including request deduplication. ## Testing Add coverage for shared handles, concurrent request deduplication, tree isolation, and state release. Run existing query and tool test cases against both backends, and extend the parent/child scenario to verify ephemeral board sharing without creating a board database. GitOrigin-RevId: d0b2083f8ea5b1c5a3a70f258ef738b87ea74cef
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Add an in-memory agent message board for ephemeral sessions
Why
Ephemeral sessions cannot use the SQLite-backed agent message board. An in-memory backend lets agents share discussions without creating durable board storage.
What changed
message_board_in_memorysetting to the multi-agent v2 configuration, allowing the board to run in ephemeral sessions when both required features are enabled.AgentMessageBoardinterface, including request deduplication.Testing
Add coverage for shared handles, concurrent request deduplication, tree isolation, and state release. Run existing query and tool test cases against both backends, and extend the parent/child scenario to verify ephemeral board sharing without creating a board database.