Mmcp.market

doncheli-diagram skill

by doncheli·doncheli/don-cheli-sdd·57 stars·Apache-2.0

Auto-generate Mermaid or C4 diagrams from code analysis. Activate when user mentions "diagram", "mermaid", "architecture diagram", "C4", "class diagram", "sequence diagram", "ERD", "flowchart", "visualize code".

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Install the doncheli-diagram skill

A skill is a folder. Copy it into your agent's skills folder and the agent loads it when the task matches its description. 

git clone --depth 1 https://github.com/doncheli/don-cheli-sdd.git /tmp/don-cheli-sdd
mkdir -p ~/.claude/skills
cp -r /tmp/don-cheli-sdd/.agent/skills/doncheli-diagram ~/.claude/skills/doncheli-diagram
available in every project

In the Claude apps, zip the folder and upload it from the Skills settings. The folder on GitHub

The instructions your agent would load

SKILL.md as published, without the frontmatter. Read it on GitHub

Don Cheli: Diagram Generator

Instructions

  1. Determine the diagram type from the request or flag: class, sequence, architecture, erd, flowchart
  2. Identify the scope: specific file, module, feature, or full project
  3. Analyze the relevant source files:
  • class: parse class/interface definitions, inheritance, and composition
  • sequence: trace function calls, async flows, and inter-module communication
  • architecture: identify top-level modules, external services, and data flows (C4 Context/Container)
  • erd: parse ORM models, entity fields, and relationships
  • flowchart: follow conditional logic for a specific feature or endpoint
  1. Build the Mermaid diagram — validate syntax mentally before outputting
  2. Keep diagrams readable: maximum 20 nodes, split into subdiagrams if larger
  3. Never invent relationships not present in the code
  4. Add a generation timestamp as a Mermaid comment
  5. Offer to embed the diagram in the target file (README, spec doc, ADR)

Supported Outputs

  • Inline Mermaid code blocks (default) — renders in GitHub, GitLab, Notion
  • C4 PlantUML (with --format c4) for advanced architecture docs
  • Save to file with --output

Quality Gate

  • If the analyzed scope yields fewer than 3 nodes, warn the user the diagram may not be useful
  • If source files are not readable (permissions, binary), skip and report which files were skipped
  • Do not use this skill to generate diagrams from memory — always analyze actual source files

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