# tractor docs diagram: the inter-actor `Context`
# dialog; tractor's SC-transitive msg protocol as
# seen from both sides of `Portal.open_context()`.
vars: {
  d2-config: {
    sketch: true
    theme-id: 1
    pad: 16
    layout-engine: elk
  }
}
shape: sequence_diagram
parent: "parent task\n(Portal)"
child: "child actor task\n(@tractor.context fn)"
parent -> child: "Start: open_context(fn, **kwargs)"
child -> parent: "StartAck"
child -> parent: "Started: await ctx.started(value)"
parent -> child: "Yield: stream.send()"
child -> parent: "Yield: stream.send()"
parent -> child: "Stop: stream closed"
child -> parent: "Return: fn return value"