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Does this work for different harnesses like Codex and Antigravity?

codex has been able to send messages across threads for a long time

But what if I use parallel agents from different harnesses? Then I probably need to build my own communication tool

You can have Codex access Claude’s conversations trivially. The other way around not so much as OpenAI locks everything server side.

I take this back. Apparently the codex conversations are indeed stored in jsonl files in the users .codex directory.