Member Junction
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    TaskGraphNodeType: "AgentTask" | "ActionTask" | "HumanTask"

    The shapes this canvas can DRAW.

    Three of the spec's seven kinds, and the choice is the canvas's: these are the shapes a person authors. Prompt, ForEach, While and External are expressible in the spec but have no authoring affordance here — a palette entry that cannot be configured would be worse than none.

    Drawing and RENDERING are different questions, which this type used to conflate. A run's graph is displayed on the same canvas, and it contains kinds nobody can draw — so mapping them all to AgentTask made a fully-configured ForEach render as "AGENT STEP · No agent chosen yet", which is not merely imprecise: it says the step is broken. See TaskGraphRenderType.