Excalidraw Skill
yctimlin/mcp_excalidraw
Excalidraw canvas toolkit for creating, editing, and refining diagrams on a live canvas.
Mermaid syntax reference for writing or fixing a diagram in an artefact: flowchart, sequence, class, state, ER, Gantt, C4, mindmap, timeline and the other diagram types, node shapes, styling…
Install Mermaid Syntax
$ npx skills add tractorjuice/arc-kit --skill mermaid-syntax -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install tractorjuice/arc-kit mermaid-syntax --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/tractorjuice/arc-kit.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/arckit-claude/skills/mermaid-syntax .claude/skills/mermaid-syntax && rm -rf skills-srcUse ~/.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/
Install the "mermaid-syntax" agent skill from https://github.com/tractorjuice/arc-kit/tree/main/plugins/arckit-claude/skills/mermaid-syntax into .claude/skills/mermaid-syntax/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mermaid-syntax", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/tractorjuice/arc-kit/tree/main/plugins/arckit-claude/skills/mermaid-syntaxType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add tractorjuice/arc-kit --skill mermaid-syntax -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install tractorjuice/arc-kit mermaid-syntax --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/tractorjuice/arc-kit.git skills-src && mkdir -p .agents/skills && cp -r skills-src/plugins/arckit-claude/skills/mermaid-syntax .agents/skills/mermaid-syntax && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "mermaid-syntax" agent skill from https://github.com/tractorjuice/arc-kit/tree/main/plugins/arckit-claude/skills/mermaid-syntax into .agents/skills/mermaid-syntax/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mermaid-syntax", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add tractorjuice/arc-kit --skill mermaid-syntax -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install tractorjuice/arc-kit mermaid-syntax --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/tractorjuice/arc-kit.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/plugins/arckit-claude/skills/mermaid-syntax .cursor/skills/mermaid-syntax && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "mermaid-syntax" agent skill from https://github.com/tractorjuice/arc-kit/tree/main/plugins/arckit-claude/skills/mermaid-syntax into .cursor/skills/mermaid-syntax/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mermaid-syntax", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/tractorjuice/arc-kit.git --path plugins/arckit-claude/skills/mermaid-syntax--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add tractorjuice/arc-kit --skill mermaid-syntax -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install tractorjuice/arc-kit mermaid-syntax --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/tractorjuice/arc-kit.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/plugins/arckit-claude/skills/mermaid-syntax .gemini/skills/mermaid-syntax && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "mermaid-syntax" agent skill from https://github.com/tractorjuice/arc-kit/tree/main/plugins/arckit-claude/skills/mermaid-syntax into .gemini/skills/mermaid-syntax/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mermaid-syntax", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install tractorjuice/arc-kit mermaid-syntaxInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add tractorjuice/arc-kit --skill mermaid-syntax -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/tractorjuice/arc-kit.git skills-src && mkdir -p .github/skills && cp -r skills-src/plugins/arckit-claude/skills/mermaid-syntax .github/skills/mermaid-syntax && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "mermaid-syntax" agent skill from https://github.com/tractorjuice/arc-kit/tree/main/plugins/arckit-claude/skills/mermaid-syntax into .github/skills/mermaid-syntax/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mermaid-syntax", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add tractorjuice/arc-kit --skill mermaid-syntax -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install tractorjuice/arc-kit mermaid-syntax --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/tractorjuice/arc-kit.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/plugins/arckit-claude/skills/mermaid-syntax .opencode/skills/mermaid-syntax && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "mermaid-syntax" agent skill from https://github.com/tractorjuice/arc-kit/tree/main/plugins/arckit-claude/skills/mermaid-syntax into .opencode/skills/mermaid-syntax/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mermaid-syntax", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
mermaid-syntax- GitHub stars
- 2.3k
- Token cost
- ~1.5k tokens
- SKILL.md length
- 497 words
- Files
- 32 (incl. references)
- Skills in repo
- 9
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Mermaid syntax reference for writing or fixing a diagram in an artefact: flowchart, sequence, class, state, ER, Gantt, C4, mindmap, timeline and the other diagram types, node shapes, styling…
- Tasks that involve Diagrams
- SKILL.md covers Supported Diagram Types, Configuration & Theming, C4 Layout Science and Common Syntax Gotchas, plus 1 more section
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Mermaid Syntax is an agent skill from tractorjuice/arc-kit. Mermaid syntax reference for writing or fixing a diagram in an artefact: flowchart, sequence, class, state, ER, Gantt, C4, mindmap, timeline and the other diagram types, node shapes, styling, theming, and why a diagram fails to render. Not needed for PlantUML (plantuml-syntax), or when the request is for a governed diagram artefact with document control, which /arckit:diagram produces.
Its SKILL.md is about 1.5k tokens, which your agent loads only when the skill is triggered. The skill folder holds 32 other files, including reference files (for example `references/architecture.md`, `references/block.md` and `references/c4-layout-science.md`).
It sits in Development, covering Diagrams. It works with Mermaid and Model Context Protocol. The repository describes itself as: The Enterprise Architecture Governance Harness — strategy, architecture, delivery, and assurance using AI coding assistants.
When your agent uses it
- Tasks that involve Diagrams
Example prompts
- “/mermaid-syntax”
Requirements
- Pre-approved tools (allowed-tools): Read(/${CLAUDE_PLUGIN_ROOT}/**)
What it can do on your machine
Read from SKILL.md and the folder at commit 6d5ad01. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves these tools, so the agent can use them without asking each time:
Read(/${CLAUDE_PLUGIN_ROOT}/**)
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
github.com
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
Mermaid Syntax loads about 1.5k tokens when it runs, and up to ~117k if it reads all its reference files. Until then it costs about 101 tokens; SKILL.md has 497 words of instructions outside code blocks.
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
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 497 words (~1,529 tokens).
“A comprehensive reference for all 23 Mermaid diagram types plus configuration and theming. This skill provides official Mermaid syntax documentation sourced from the mermaid-skill project (auto-synced from upstream Mermaid docs).”
- name
- mermaid-syntax
- allowed-tools
- Read(/${CLAUDE_PLUGIN_ROOT}/**)
- paths
- **/*.mmd, **/*.mermaid, **/ARC-*-DIAG-*.md, **/ARC-*-DATA-*.md
Files
SKILL.md and 31 other files (references) in plugins/arckit-claude/skills/mermaid-syntax of tractorjuice/arc-kit.
- SKILL.md
- references/architecture.md
- references/block.md
- references/c4-layout-science.md
- references/c4.md
- references/classDiagram.md
- references/config-configuration.md
- references/config-directives.md
- references/config-layouts.md
- references/config-math.md
- references/config-theming.md
- references/config-tidy-tree.md
- references/entityRelationshipDiagram.md
- references/examples.md
- references/flowchart.md
- references/gantt.md
- references/gitgraph.md
- references/kanban.md
- references/mindmap.md
- references/packet.md
- … and 12 more
Open the folder on GitHubat commit 6d5ad01
Compare with similar skills
Mermaid Syntax 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Mermaid Syntax this skilltractorjuice/arc-kit | 2.3k | — | ~1.5k | Automated safety check: Pass | Custom licence | |
| Excalidraw Skillyctimlin/mcp_excalidraw | 2.5k | — | ~4.6k | Automated safety check: Pass | MIT | |
| GitDiagram Repository Overviewahmedkhaleel2004/gitdiagram | 18k | — | ~427 | Automated safety check: Pass | MIT | |
| Drawiobahayonghang/drawio-skills | 287 | — | ~4.1k | Automated safety check: Notes | MIT | |
| Mermaid Diagramsveelenga/claude-mermaid | 215 | — | ~1.3k | Automated safety check: Pass | MIT | |
| Excalidraw Canvas Toolkitlingzhi227/agent-research-skills | 386 | — | ~3.8k | Automated safety check: Pass | None |
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Explains the architecture of a public GitHub repository through GitDiagram: how the code is organized, the main components with paths, and a Mermaid diagram.
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Draws and refines Excalidraw diagrams on a live canvas through MCP tools or a REST API, with screenshots, file import and export, snapshots and Mermaid conversion.
Excalidraw Diagram Design
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Guide for structuring graph input (nodes and edges) for the Excalidraw Architect MCP tool to produce clean, readable diagrams.
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Related
Works with
Categories
Questions about Mermaid Syntax
What does Mermaid Syntax do?
Mermaid syntax reference for writing or fixing a diagram in an artefact: flowchart, sequence, class, state, ER, Gantt, C4, mindmap, timeline and the other diagram types, node shapes, styling…. Mermaid Syntax is an agent skill from tractorjuice/arc-kit. Mermaid syntax reference for writing or fixing a diagram in an artefact: flowchart, sequence, class, state, ER, Gantt, C4, mindmap, timeline and the other diagram types, node shapes, styling, theming, and why a diagram fails to render.
When should I use Mermaid Syntax?
Mermaid Syntax fits situations like: tasks that involve Diagrams.
How do I install Mermaid Syntax in Claude Code?
Run `npx skills add tractorjuice/arc-kit --skill mermaid-syntax -a claude-code`. Or copy the skill folder (plugins/arckit-claude/skills/mermaid-syntax in tractorjuice/arc-kit) into .claude/skills/mermaid-syntax in your project. Claude Code loads it when a task matches its description.
How do I install Mermaid Syntax in Codex?
Run `npx skills add tractorjuice/arc-kit --skill mermaid-syntax -a codex`. Or copy the skill folder (plugins/arckit-claude/skills/mermaid-syntax in tractorjuice/arc-kit) into .agents/skills/mermaid-syntax in your project. Codex loads it when a task matches its description.
Can I use Mermaid Syntax 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 tractorjuice/arc-kit --skill mermaid-syntax -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/mermaid-syntax, .gemini/skills/mermaid-syntax, .github/skills/mermaid-syntax and .opencode/skills/mermaid-syntax in your project.
What does Mermaid Syntax need to run?
SKILL.md names no scripts, command-line tools or credentials: Mermaid Syntax is instructions for the agent only. Its frontmatter pre-approves these tools: Read(/${CLAUDE_PLUGIN_ROOT}/**).
Does Mermaid Syntax access the network?
SKILL.md names 1 domain. As links in the text: github.com. This is read from the text; nothing was executed.
Is Mermaid Syntax 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 Mermaid Syntax use?
Mermaid Syntax has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.
How many tokens does Mermaid Syntax use?
About 1.5k tokens (SKILL.md is roughly 6.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 115k tokens, read only when the agent opens those files.
What are the alternatives to Mermaid Syntax?
Skills that share tags, products or a category with Mermaid Syntax: Excalidraw Skill (yctimlin/mcp_excalidraw, 2.5k stars), GitDiagram Repository Overview (ahmedkhaleel2004/gitdiagram, 18k stars), Drawio (bahayonghang/drawio-skills, 287 stars) and Mermaid Diagrams (veelenga/claude-mermaid, 215 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Mermaid Syntax?
tractorjuice (a GitHub user) maintains it in tractorjuice/arc-kit, which has 2,253 GitHub stars. The repository holds 9 skills in this directory. The repository was last updated on October 8, 2026.
Source: tractorjuice/arc-kit on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.