Workflow A calls reusable workflow B, which calls reusable workflow C. What is true about further nesting?
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Short Explanation and Infographic
Reusable workflows support limited nesting (not infinite). Plan architecture within the platform maximum depth.
Full explanation below image
Full Explanation
GitHub documents a maximum nesting depth for reusable workflow calls (historically a small number such as 4 including the caller chain—authors should verify current docs). Exceeding it fails validation/execution. Intermediate reusable workflows may call others within the limit. Composite actions nest differently (step uses) and are not the same mechanism. File size limits are separate concerns. Prefer shallow graphs: top-level orchestration workflow calling leaf reusable workflows rather than deep pyramids.