Pulling behaviour for pre-approved command #564

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When the model interleaves some long-running command's status checking (which itself runs fast, and was approved to always run in current session with no prompt) with sleep calls, I can see the following picture:

(all N status checks succeed, and we're just waiting for sleeps). I understand this is because ECA tries to run commands in parallel, but is there some workaround here for serial execution?