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Agent skill

Diagramming

by ynulihao in ynulihao/AgentSkillOS

Create technical diagrams using Mermaid syntax for architecture, sequences, ERDs, flowcharts, and state machines.

No licenceAuto-check passedDevelopment

Install Diagramming

skills CLI
$ npx skills add ynulihao/AgentSkillOS --skill diagramming -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install ynulihao/AgentSkillOS diagramming --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/ynulihao/AgentSkillOS.git skills-src && mkdir -p .claude/skills && cp -r skills-src/data/skill_seeds/diagramming .claude/skills/diagramming && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
diagramming
GitHub stars
617
Token cost
~2.4k tokens
SKILL.md length
189 words
Files
1
Skills in repo
26
Repo updated
First seen
Licence
None found

At a glance

Create technical diagrams using Mermaid syntax for architecture, sequences, ERDs, flowcharts, and state machines.

  • Works in 2 steps: Choose the Right Diagram Type → General Mermaid Principles
  • Visualizing system design
  • SKILL.md covers Overview, Instructions, Best Practices and Examples
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Diagramming is an agent skill from ynulihao/AgentSkillOS. Create technical diagrams using Mermaid syntax for architecture, sequences, ERDs, flowcharts, and state machines. Use for visualizing system design, data flows, and processes. Triggers: diagram, mermaid, architecture diagram, sequence diagram, flowchart, ERD, entity relationship, state diagram, C4 model, component diagram, visualize, draw.

Its SKILL.md is about 2.4k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Development, covering Diagrams. It works with Mermaid. The repository describes itself as: Build your agent from 200,000+ skills via skill RETRIEVAL & ORCHESTRATION.

When your agent uses it

  • Visualizing system design
  • Tasks that involve Diagrams

Example prompts

  • “/diagramming”

Requirements

  • Node.js

Workflow steps

2 steps, taken from the step headings in SKILL.md.

  1. Choose the Right Diagram Type
  2. General Mermaid Principles

What it can do on your machine

Read from SKILL.md and the folder at commit c3cfae1. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are mermaid).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Diagramming loads about 2.4k tokens when it runs. Until then it costs about 88 tokens; SKILL.md has 189 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~88
When it runs · the whole SKILL.md, loaded when a task matches
~2.4k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

Without a licence we can't republish the file, so here is its outline and opening line. It has 189 words (~2,408 tokens).

“Create clear, maintainable technical diagrams using Mermaid syntax. This skill covers architecture diagrams, sequence diagrams, entity-relationship diagrams, flowcharts, and state diagrams for documenting software systems.”

— opening of SKILL.md by ynulihao
name
diagramming

Read the full SKILL.md on GitHub

Files

Just SKILL.md in data/skill_seeds/diagramming of ynulihao/AgentSkillOS.

Open the folder on GitHubat commit c3cfae1

Compare with similar skills

Diagramming next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Diagramming compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Diagramming this skillynulihao/AgentSkillOS617—~2.4kAutomated safety check: PassNone
Archify Diagramstt-a1i/archify81k—~2.9kAutomated safety check: PassMIT
Diagram Designcathrynlavery/diagram-design47k1 repos~7.5kAutomated safety check: PassMIT
Draw.io Diagram StudioAgents365-ai/drawio-skill10k—~2.4kAutomated safety check: NotesMIT
Pretty Mermaid Rendererimxv/Pretty-mermaid-skills1.5k—~2kAutomated safety check: PassMIT
Archify Diagram BuilderUnclecheng-li/AI_Animation1.5k2 repos~4.1kAutomated safety check: PassMIT

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Works with

Categories

Questions about Diagramming

What does Diagramming do?

Create technical diagrams using Mermaid syntax for architecture, sequences, ERDs, flowcharts, and state machines. Diagramming is an agent skill from ynulihao/AgentSkillOS. Create technical diagrams using Mermaid syntax for architecture, sequences, ERDs, flowcharts, and state machines.

When should I use Diagramming?

Diagramming fits situations like: visualizing system design; tasks that involve Diagrams.

How do I install Diagramming in Claude Code?

Run `npx skills add ynulihao/AgentSkillOS --skill diagramming -a claude-code`. Or copy the skill folder (data/skill_seeds/diagramming in ynulihao/AgentSkillOS) into .claude/skills/diagramming in your project. Claude Code loads it when a task matches its description.

How do I install Diagramming in Codex?

Run `npx skills add ynulihao/AgentSkillOS --skill diagramming -a codex`. Or copy the skill folder (data/skill_seeds/diagramming in ynulihao/AgentSkillOS) into .agents/skills/diagramming in your project. Codex loads it when a task matches its description.

Can I use Diagramming in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add ynulihao/AgentSkillOS --skill diagramming -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/diagramming, .gemini/skills/diagramming, .github/skills/diagramming and .opencode/skills/diagramming in your project.

What does Diagramming need to run?

SKILL.md names no scripts, command-line tools or credentials: Diagramming is instructions for the agent only. Our summary lists: Node.js.

Does Diagramming access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Diagramming safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Diagramming use?

No licence was found for Diagramming or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.

How many tokens does Diagramming use?

About 2.4k tokens (SKILL.md is roughly 9.6k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Diagramming?

Skills that share tags, products or a category with Diagramming: Archify Diagrams (tt-a1i/archify, 81k stars), Diagram Design (cathrynlavery/diagram-design, 47k stars), Draw.io Diagram Studio (Agents365-ai/drawio-skill, 10k stars) and Pretty Mermaid Renderer (imxv/Pretty-mermaid-skills, 1.5k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Diagramming?

ynulihao (a GitHub user) maintains it in ynulihao/AgentSkillOS, which has 617 GitHub stars. The repository holds 26 skills in this directory. The repository was last updated on March 7, 2026.

Source: ynulihao/AgentSkillOS on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.