Doncheli Diagram

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

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: doncheli
• Source: doncheli/don-cheli-sdd
• License: Apache-2.0
• Homepage: https://doncheli.tv

Install and usage instructions live in the source repository linked above.