Cross-session messaging in Claude is really a game change for me: I have a many sessions across multiple repositories: some on https://github.com/dev-null-sh/dev-null.sh (one for x-session messaging, others to work on features), some on https://github.com/jubianchi/dev-null-ext, some on https://github.com/nativephp/dev-null-app.
When I start something in the ext or on the app and Claude needs information, it only has to ask the other sessions (they have all the context ready) instead of poking around itself: "how the API is made for this?", "how did you do that on your side, I need to do something similar?", …
If you don't use it, you should try :)
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