Creates, edits, reviews, and regenerates C4 architecture diagrams written with goa.design/model and the mdl CLI. Use when changing Model DSL, model.go or views.go files, system landscape, context, container, component, dynamic, or deployment views, element relationships, boundaries, layout, or generated SVG diagrams.
Use when designing or reviewing the tools an LLM agent will call — choosing tool boundaries, argument and result shapes, retrieval/search/get decompositions, MCP or goa-ai toolset surfaces — or when an agent misuses existing tools (wrong tool picked, IDs carried between calls, wrong dates computed, confident answers…