Node types

type	Purpose	Key fields
entry	graph start and the variables it begins with	variables, next
stage	run a registered stage	stage, arguments, outputs, consume, next
condition	binary branch on a CEL expression	condition, then, else
switch	n-way branch, first matching case wins	cases: [{when, next}], default
parallel	concurrent branches with independent frames	branches, cancel_on_error, next
try	block-scoped error handling over a graph region	body, except, next
map	run a graph region once per element of a list	items, body, item_var, collect, mode, next
subpipeline	nested pipeline with a fresh frame	subpipeline_id, inputs, artifact_outputs, result_output, next
terminal	end of execution	result, artifacts

Every node additionally accepts retry, consume (drop names from the frame after the step) and expose (copy or rename a variable without a stage).

In the editor the node types are the top of the palette; the stages the backend knows about come below them.