Doncheli Diagram

Community

doncheli

doncheli-diagram

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".

Overview

Publisher	doncheli
Repository	`don-cheli-sdd`
Skill name	`doncheli-diagram`
Stars	59
Forks	12
Bundled files	Instructions only
License	Apache-2.0
Links	Skill source Repository Homepage

Markdown instructions
A SKILL.md file the model loads on demand, so it only costs tokens when a request actually matches.
Works with any LLM
AI skills are plain Markdown, not provider-specific code, so this works with GPT, Claude, Gemini, Grok, or a local model.
Self-contained
Everything the model needs lives in the instructions — no extra files to sync.
Open source
Published by doncheli on GitHub. Read the source before you install it.

Installation

Install the Doncheli Diagram AI skill in TypingMind to use it with any LLM, or drop it into another agent that reads SKILL.md.

Install in TypingMind

TypingMind installs a skill straight from its GitHub folder — it reads SKILL.md, bundles the resource files, and stores the result locally.

Open the app and go to Plugins → Skills.
Choose "Install from GitHub".
Paste the skill folder URL below and confirm.
https://github.com/doncheli/don-cheli-sdd/tree/main/.agent/skills/doncheli-diagram
Enable the skill in any chat where you want it available.

Plugins → Skills → Add skill → From GitHub URL, then paste the folder URL and press Continue.

Install in another agent

Any agent that reads the Agent Skills format can use this skill — copy the folder into that agent's skills directory.

Claude Code — .claude/skills

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

Restart Claude Code after copying so it picks up the new skill.

Use it in TypingMind

Enable Doncheli Diagram in any TypingMind chat and the model takes it from there. Its name and description sit in the system prompt, and the moment a request matches, the model loads the full instructions itself — you never invoke it by hand, and it costs no tokens until it is actually used.

The model loads Doncheli Diagram on its own as soon as a request matches it.

Works with any AI model

AI skills are plain Markdown instructions rather than provider-specific code, so Doncheli Diagram is not tied to the model it was written for. Install it once in TypingMind and use it with GPT-5, Claude, Gemini, Grok, DeepSeek, Mistral, Llama, or a local model you run yourself — all on your own API keys.

Loaded only when it is needed
The system prompt carries just the name and description. The instructions are fetched on the first matching request, so an idle skill costs nothing.
Switch models mid-chat
Because the skill is instructions rather than code, changing model does not break it — the next model reads the same SKILL.md.

Skill instructions

This is the SKILL.md content the model loads. Read it before installing — a skill is instructions your model will follow.

Don Cheli: Diagram Generator

Instructions

Determine the diagram type from the request or flag: class, sequence, architecture, erd, flowchart
Identify the scope: specific file, module, feature, or full project
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
Build the Mermaid diagram — validate syntax mentally before outputting
Keep diagrams readable: maximum 20 nodes, split into subdiagrams if larger
Never invent relationships not present in the code
Add a generation timestamp as a Mermaid comment
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 <path>

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

Frequently asked questions

What does the Doncheli Diagram AI skill do?

Why use Doncheli Diagram on TypingMind?

Because you install it once and use it with any model. Doncheli Diagram is plain Markdown rather than provider-specific code, so the same skill runs on GPT-5, Claude, Gemini, Grok, or a local model — and you can switch model mid-chat without it breaking. TypingMind runs on your own API keys, so you pay providers directly instead of a per-seat subscription, and your skills and chats stay in your own storage.

How do I install Doncheli Diagram in TypingMind?

Open Plugins → Skills → Install from GitHub in TypingMind and paste https://github.com/doncheli/don-cheli-sdd/tree/main/.agent/skills/doncheli-diagram. TypingMind reads its SKILL.md and installs it as a skill you can enable per chat.

Which AI models can use Doncheli Diagram?

Any model you connect in TypingMind. AI skills are plain Markdown instructions rather than provider-specific code, so GPT, Claude, Gemini, Grok, and local models can all load this skill when a request matches it.

How many AI models can I use with Doncheli Diagram?

As many as you like. As long as a model supports skills, you can use Doncheli Diagram with it — GPT, Claude, Gemini, Grok, DeepSeek, Mistral, Llama and more — all on TypingMind with your own API keys.

Is the Doncheli Diagram AI skill free?

Yes. It is published on GitHub by doncheli under the Apache-2.0 license. You only pay your own AI provider for the tokens you use.

What are AI skills?

An AI skill is a reusable instruction bundle that teaches an AI model how to do one specific task. It follows the open Agent Skills format: a SKILL.md file with a name and description, plus any scripts, templates or reference files the model may need. The model reads the instructions only when your request matches the skill, so an installed skill costs nothing until it is used.

How are AI skills different from plugins or MCP servers?

A plugin or MCP server gives a model new tools to call — code that runs somewhere and returns a result. An AI skill gives the model knowledge and process instead: how to approach a task, which steps to follow, what good output looks like. Skills are plain Markdown, so they need no server, no API key and no runtime, and they work with any model.

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Overview

Installation

Install in TypingMind

Install in another agent

Use it in TypingMind

Works with any AI model

Skill instructions

Don Cheli: Diagram Generator

Instructions

Supported Outputs

Quality Gate

Frequently asked questions

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