OptionalassertionsDeterministic assertions — latch for free every step. Preferred.
OptionalinstructionPlan hint appended to the goal so the controller passes through here.
Stable label for the section, e.g. "agents-list".
OptionalvisualVisual criteria requiring the LLM judge (e.g. "chart rendered with bars").
JSON shape of one checkpoint tour section (mapped to
RunCheckpoint).