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Agent runtimes disagree on what a session is
Author here. I work on Gobare, one of the three, so I quoted the other two from their docs rather than describing them, and included where each of us loses. Short version: Perplexity keeps a container for one response, OpenAI's hosted sandbox can be deleted after an hour of quiet, and Gobare pauses after five idle minutes and restores workspace files best-effort. Corrections welcome.