diagram

Use when a visual model would help explain or communicate a request, even if the user does not explicitly ask for a diagram. Useful for code module dependencies, call chains, architecture, workflows, state transitions, data models, sequence flows, and other relationships.

Use when the task needs Mermaid `zenuml` syntax, especially for new sequence diagrams, interaction flows, API call chains, or when the user explicitly asks for ZenUML. Focuses on drafting valid ZenUML syntax and using the packaged diagram draw CLI to validate and render it.