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Agent skill

Diagram Maker

by openclaw in openclaw/openclaw

Create SVG/HTML or Excalidraw diagrams for concepts, architecture, flows, and whiteboards.

MITAuto-check passedDevelopment

Install Diagram Maker

skills CLI
$ npx skills add openclaw/openclaw --skill diagram-maker -a claude-code

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

GitHub CLI
$ gh skill install openclaw/openclaw diagram-maker --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/openclaw/openclaw.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/diagram-maker .claude/skills/diagram-maker && 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
diagram-maker
GitHub stars
392k
Used in
2 other repos
Token cost
~589 tokens
SKILL.md length
276 words
Files
3 (incl. references)
Skills in repo
93
Repo updated
First seen
Licence
MIT

At a glance

Create SVG/HTML or Excalidraw diagrams for concepts, architecture, flows, and whiteboards.

  • Works in 5 steps: Extract nodes, groups, labels, and… → Pick layout first: left-to-right,… → Keep labels short. Prefer 5-9 main… → …
  • Tasks that involve Diagrams
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Diagram Maker is an agent skill from openclaw/openclaw. Create SVG/HTML or Excalidraw diagrams for concepts, architecture, flows, and whiteboards.

Its SKILL.md is about 590 tokens, which your agent loads only when the skill is triggered. The skill folder holds 3 other files, including reference files (for example `references/excalidraw-patterns.md` and `references/svg-template.md`).

It sits in Development, covering Diagrams. It works with Excalidraw. The repository describes itself as: The AI that really does things. Any OS. Any Platform. The lobster way. 🦞. The licence is MIT.

When your agent uses it

  • Tasks that involve Diagrams

Example prompts

  • “/diagram-maker”

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

  1. Extract nodes, groups, labels, and directed relationships.
  2. Pick layout first: left-to-right, top-down, hub-spoke, swimlanes, layered stack, sequence.
  3. Keep labels short. Prefer 5-9 main elements over dense diagrams.
  4. Generate the file at the requested path, or ./diagram.html / ./diagram.excalidraw.
  5. Verify syntax by opening/parsing when feasible.

What it can do on your machine

Read from SKILL.md and the folder at commit 1eb5970. 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.

    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

Diagram Maker loads about 589 tokens when it runs, and up to ~1.4k if it reads all its reference files. Until then it costs about 26 tokens; SKILL.md has 276 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~26
When it runs · the whole SKILL.md, loaded when a task matches
~589
With references · SKILL.md plus every file in references/, read only if the agent opens them
~1.4k

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

The full file from openclaw/openclaw at commit 1eb5970, republished under its MIT licence (© openclaw). 276 words, ~589 tokens.

Download SKILL.mdSave it as .claude/skills/diagram-maker/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.
name
diagram-maker
description
Create SVG/HTML or Excalidraw diagrams for concepts, architecture, flows, and whiteboards.

Diagram Maker

Create diagrams as artifacts, not prose. Choose one output mode:

  • clean-svg: educational concepts, physical systems, processes, lifecycle, simple data flow.
  • architecture-svg: software/cloud/infra topology, services, databases, queues, trust zones.
  • excalidraw: editable hand-drawn whiteboard, flowchart, sequence, architecture sketch.

Routing

  • User wants editable/collaborative: choose Excalidraw.
  • User wants polished standalone browser output: choose SVG/HTML.
  • Software architecture with infra components: choose architecture SVG.
  • Science, product, process, concept map, physical object: choose clean SVG.
  • Unsure: ask one short question only if output format matters; otherwise choose clean SVG.

Workflow

  1. Extract nodes, groups, labels, and directed relationships.
  2. Pick layout first: left-to-right, top-down, hub-spoke, swimlanes, layered stack, sequence.
  3. Keep labels short. Prefer 5-9 main elements over dense diagrams.
  4. Generate the file at the requested path, or ./diagram.html / ./diagram.excalidraw.
  5. Verify syntax by opening/parsing when feasible.

SVG/HTML rules

  • Single standalone .html file with inline CSS and inline SVG.
  • No external fonts, JS, images, gradients, glows, decorative blobs, or remote assets.
  • Use semantic colors, not rainbow sequences: neutral, input, process, storage, external, risk.
  • Draw connectors before nodes so arrows sit behind boxes.
  • Every connector path has fill="none" and a marker arrow when directed.
  • Leave 24px text padding inside boxes; do not let text touch borders.
  • Legend only when symbols/colors are not obvious.

SVG template

Use references/svg-template.md as the wrapper and replace <!-- SVG -->.

Excalidraw rules

  • Save .excalidraw JSON with type, version, source, elements, and appState.
  • Use bound text for shape labels. Do not use a nonstandard label property.
  • Keep bound text immediately after its container in the elements array.
  • Minimum labeled shape: 120x60. Minimum body text: 16px.
  • Use roughness 1, fontFamily: 1, and simple fills.

For exact Excalidraw element snippets, read references/excalidraw-patterns.md.

© openclaw, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 2 other files (references) in skills/diagram-maker of openclaw/openclaw.

  • SKILL.md
  • references/excalidraw-patterns.md
  • references/svg-template.md

Open the folder on GitHubat commit 1eb5970

Used in 2 other repositories

We found 2 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 2 other GitHub owners. This page covers the copy in openclaw/openclaw, which our catalogue first saw on October 8, 2026.

Compare with similar skills

Diagram Maker 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.

Diagram Maker compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Diagram Maker this skillopenclaw/openclaw392k2 repos~589Automated safety check: PassMIT
Diagram Designcathrynlavery/diagram-design45k1 repos~7.5kAutomated safety check: PassMIT
Excalidraw Diagramcoleam00/excalidraw-diagram-skill5k2 repos~6.1kAutomated safety check: PassNone
Excalidraw Diagrambreferrari/obsidian-mind4.9k—~3.9kAutomated safety check: PassMIT
Excalidraw Skillyctimlin/mcp_excalidraw2.5k—~4.6kAutomated safety check: PassMIT
Lanshu Animated Architecture Diagramcclank/lanshu-animated-architecture-diagram994—~1.1kAutomated safety check: PassMIT

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Works with

Categories

Questions about Diagram Maker

What does Diagram Maker do?

Create SVG/HTML or Excalidraw diagrams for concepts, architecture, flows, and whiteboards. Diagram Maker is an agent skill from openclaw/openclaw. Create SVG/HTML or Excalidraw diagrams for concepts, architecture, flows, and whiteboards.

When should I use Diagram Maker?

Diagram Maker fits situations like: tasks that involve Diagrams.

How do I install Diagram Maker in Claude Code?

Run `npx skills add openclaw/openclaw --skill diagram-maker -a claude-code`. Or copy the skill folder (skills/diagram-maker in openclaw/openclaw) into .claude/skills/diagram-maker in your project. Claude Code loads it when a task matches its description.

How do I install Diagram Maker in Codex?

Run `npx skills add openclaw/openclaw --skill diagram-maker -a codex`. Or copy the skill folder (skills/diagram-maker in openclaw/openclaw) into .agents/skills/diagram-maker in your project. Codex loads it when a task matches its description.

Can I use Diagram Maker 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 openclaw/openclaw --skill diagram-maker -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/diagram-maker, .gemini/skills/diagram-maker, .github/skills/diagram-maker and .opencode/skills/diagram-maker in your project.

What does Diagram Maker need to run?

SKILL.md names no scripts, command-line tools or credentials: Diagram Maker is instructions for the agent only.

Does Diagram Maker 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 Diagram Maker 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 Diagram Maker use?

Diagram Maker is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Diagram Maker use?

About 589 tokens (SKILL.md is roughly 2.4k 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 831 tokens, read only when the agent opens those files.

What are the alternatives to Diagram Maker?

Skills that share tags, products or a category with Diagram Maker: Diagram Design (cathrynlavery/diagram-design, 45k stars), Excalidraw Diagram (coleam00/excalidraw-diagram-skill, 5k stars), Excalidraw Diagram (breferrari/obsidian-mind, 4.9k stars) and Excalidraw Skill (yctimlin/mcp_excalidraw, 2.5k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Diagram Maker?

openclaw (a GitHub organization) maintains it in openclaw/openclaw, which has 391,610 GitHub stars. The repository holds 93 skills in this directory. The repository was last updated on October 8, 2026.

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