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`WhileStep.validate()` and `DoWhileStep.validate()` already reject a non-list `steps` body, but the engine's `execute()` path does not auto-validate (see `WorkflowEngine.load_workflow`, whose docstring notes the definition is "not yet validated"). On an unvalidated run the body is returned as `next_steps`, and the engine feeds it straight into `_execute_steps`, which iterates it as step mappings. A non-list `steps` — a single mapping or scalar authoring mistake — was iterated element-wise (a dict yields its string keys, a str its characters) and raised `AttributeError` on `.get()`, taking down the whole run; the engine invokes `step_impl.execute()` with no surrounding try/except. Guard both `execute` paths to return a FAILED StepResult naming the type error instead, mirroring the if/switch non-list-branch and fan-out non-list `items` handling. The do-while body always dispatches on the first call, so its guard is unconditional; the while body only dispatches when the condition is truthy, so its guard fires only then — a false condition leaves a non-list `steps` benign and the step completes, unchanged. The condition/expression is still evaluated first, so its result is surfaced in the step output for downstream context. Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>