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question: Let's say I have 2 separate repos where prefect lives...can I post a 'wait for done" flag type object (similar to airflow) that sends a signal to the 2nd Flow that it can be started?

Hi <@U0366BB31GE>, a couple of things. You can code this with the native requests library like <https://discourse.prefect.io/t/can-i-use-python-requests-library-to-trigger-a-flow-run-through-the-graphql-api/127|this>. You can use `Client.create_flow_run` and lastly you can use the `create_flow_run` built-in task by invoking it with `create_flow_run.run(…)`

So the first Flow would trigger the second Flow in this model

And regarding your "wait for done aspect", Prefect also has a task allowing you to poll the child flow run for status and block until its (successful) completion called `wait_for_flow_run`. Check out this Discourse topic if you need an example <https://discourse.prefect.io/t/how-can-i-create-a-subflow-and-block-until-it-s-completed/94>