Claude Skills for diagrams
Generate Mermaid and PlantUML diagrams that stay readable in docs, PRs, and wikis. Flowcharts, sequence, ERD, architecture, decision trees.
How to install
Claude Code (CLI): Download the pack, then unzip into your skills folder.
mkdir -p ~/.claude/skills
unzip ~/Downloads/diagram-pack.zip -d ~/.claude/skills/For project-only skills, use .claude/skills/ in your repo root instead. Restart Claude Code (or the session) and the skills become available.
Claude.ai (web): Upload via Settings → Skills (where supported on your plan).
Skills in this pack
Mermaid Flowchart Builder
Generates a clean Mermaid flowchart for a process or decision flow. Top-down or left-right, decision diamonds, end states.
Sequence Diagram Builder
Generates a Mermaid sequence diagram for service-to-service or actor-to-system interactions. Async, alt/loop, notes.
ERD Builder
Generates a Mermaid entity-relationship diagram for a database schema. Entities, attributes, types, cardinality.
Architecture Diagram Builder
Generates a system architecture diagram — components, data stores, external deps, request flow. Mermaid graph or PlantUML C4.
Decision Tree Builder
Generates a decision tree (clinical, troubleshooting, classification) with yes/no branches and terminal recommendations.
Mindmap Builder
Generates a Mermaid mindmap for brainstorming, topic exploration, or breaking down a problem into branches.
Org Chart Builder
Generates a Mermaid org chart with hierarchical reporting lines, rounded boxes, and dotted-line for matrix relationships.
Excalidraw Diagram Builder
Convert a natural-language description into an Excalidraw whiteboard diagram where shape and layout encode conceptual relationships — fan-outs for one-to-many, chains for sequences, overlapping boxes for shared ownership.
Draw.io Diagram Builder
Generate an editable draw.io diagram from a natural-language description, a codebase, Terraform or Kubernetes config, or a SQL schema, with official vendor shapes and PNG/SVG/PDF export through the draw.io desktop CLI.
Editorial Diagram Designer
Draws a publication-quality diagram as a self-contained HTML file with inline SVG, chosen from thirty-nine types, skinned to your own brand tokens, and held to six connector rules that decide whether a reader can actually trace a line.