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* fix(workflows): fail if/switch steps on non-list branch instead of crashing `IfThenStep.validate()` and `SwitchStep.validate()` already reject a non-list branch (`then`/`else`, and `case`/`default`), 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 selected branch is fed straight into `next_steps`, which `_execute_steps` iterates as step mappings. A non-list branch — 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 switch non-mapping `cases` and fan-out non-list `items` handling. The switch guard is factored into a shared `_non_list_branch_failure` helper covering both `case` and `default` branches. A missing `else`/`default` still defaults to an empty list (COMPLETED), unchanged; the guard fires only on an explicit non-list value. 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> * Potential fix for pull request finding Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> * Potential fix for pull request finding Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> * Potential fix for pull request finding Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> * test(workflows): cover switch non-list branch execute paths Copilot flagged the new switch branch guards as untested: coverage stopped at a non-mapping `cases` container. Add SwitchStep.execute tests for a matched case with a non-list body and a non-list default (dict/str/int), asserting FAILED, the branch-specific error, empty next_steps, and preserved expression_value. Also add explicit `default: null` / `else: null` normalization tests so the validator-approved empty-branch contract cannot regress. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
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