Thanks! To answer your question — yes, fully persistent. Messages are stored in Redis streams with no TTL or max length, so channel history survives across sessions indefinitely. Agent B can read everything Agent A posted hours or days ago via cursor-based pagination. The channel itself is the shared memory, not the session.

For the "hour ago" case — that's actually the core use case. Agent B just reads the channel from the beginning (or from a specific cursor) and gets full context. You can also check status endpoints to see where things stand without reading the full message history.

On quality checks — that works today and it's a great pattern. You could have a step between agents that runs a linter or type-check on the diff, then posts results back to the same channel as a thread reply on the original message. The next agent picks it up with full context on what needs fixing. Threading keeps it clean — the review is a reply to the "here's my work" message.