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Agent skill

Flowchart Creator

by mhattingpete in mhattingpete/claude-skills-marketplace

Create HTML flowcharts and process diagrams with decision trees, color-coded stages, arrows, and swimlanes.

Apache-2.0Auto-check passedDevelopment

Install Flowchart Creator

skills CLI
$ npx skills add mhattingpete/claude-skills-marketplace --skill flowchart-creator -a claude-code

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

GitHub CLI
$ gh skill install mhattingpete/claude-skills-marketplace flowchart-creator --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/mhattingpete/claude-skills-marketplace.git skills-src && mkdir -p .claude/skills && cp -r skills-src/visual-documentation-plugin/skills/flowchart-creator .claude/skills/flowchart-creator && 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
flowchart-creator
GitHub stars
680
Token cost
~518 tokens
SKILL.md length
105 words
Files
5 (incl. references, assets)
Skills in repo
16
Repo updated
First seen
Licence
Apache-2.0

At a glance

Create HTML flowcharts and process diagrams with decision trees, color-coded stages, arrows, and swimlanes.

  • Works in 5 steps: Start/End nodes: rounded rectangles… → Process boxes: rectangles (#4299e1 blue) → Decision diamonds: diamonds (#f59e0b… → …
  • Users request flowcharts
  • SKILL.md covers When to Use, Components, HTML Structure and Node Patterns, plus 1 more section
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Flowchart Creator is an agent skill from mhattingpete/claude-skills-marketplace. Create HTML flowcharts and process diagrams with decision trees, color-coded stages, arrows, and swimlanes. Use when users request flowcharts, process diagrams, workflow visualizations, or decision trees.

Its SKILL.md is about 520 tokens, which your agent loads only when the skill is triggered. The skill folder holds 7 other files, including reference files and assets (for example `references/design_patterns.md` and `references/svg_library.md`).

It sits in Development, covering Diagrams. The repository describes itself as: Claude Code Skills for software engineering workflows - Git automation, testing, and code review. The licence is Apache-2.0.

When your agent uses it

  • Users request flowcharts
  • Process diagrams
  • Workflow visualizations

Example prompts

  • “/flowchart-creator”

Workflow steps

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

  1. Start/End nodes: rounded rectangles (#48bb78 green, #e53e3e red)
  2. Process boxes: rectangles (#4299e1 blue)
  3. Decision diamonds: diamonds (#f59e0b orange)
  4. Arrows: connecting paths with labels
  5. Swimlanes: grouped sections (optional)

What it can do on your machine

Read from SKILL.md and the folder at commit b5b34bc. 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 html).

    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

Flowchart Creator loads about 518 tokens when it runs, and up to ~7.7k if it reads all its reference files. Until then it costs about 56 tokens; SKILL.md has 105 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~56
When it runs · the whole SKILL.md, loaded when a task matches
~518
With references · SKILL.md plus every file in references/, read only if the agent opens them
~7.7k

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 mhattingpete/claude-skills-marketplace at commit b5b34bc, republished under its Apache-2.0 licence (© mhattingpete). 105 words, ~518 tokens.

Download SKILL.mdSave it as .claude/skills/flowchart-creator/SKILL.md (or your agent's skills folder). This skill also uses 4 other files; get the full folder from GitHub.
name
flowchart-creator
description
Create HTML flowcharts and process diagrams with decision trees, color-coded stages, arrows, and swimlanes. Use when users request flowcharts, process diagrams, workflow visualizations, or decision trees.

Flowchart Creator

Create interactive HTML flowcharts and process diagrams.

When to Use

  • "Create flowchart for [process]"
  • "Generate process flow diagram"
  • "Make decision tree for [workflow]"
  • "Show workflow visualization"

Components

  1. Start/End nodes: rounded rectangles (#48bb78 green, #e53e3e red)
  2. Process boxes: rectangles (#4299e1 blue)
  3. Decision diamonds: diamonds (#f59e0b orange)
  4. Arrows: connecting paths with labels
  5. Swimlanes: grouped sections (optional)

HTML Structure

html
<!DOCTYPE html>
<html>
<head>
  <title>[Process] Flowchart</title>
  <style>
    body { font-family: system-ui; }
    svg { max-width: 100%; }
    .start-end { fill: #48bb78; }
    .process { fill: #4299e1; }
    .decision { fill: #f59e0b; }
  </style>
</head>
<body>
  <h1>[Process Name] Flowchart</h1>
  <svg viewBox="0 0 800 600">
    <!-- flowchart nodes and connectors -->
  </svg>
</body>
</html>

Node Patterns

html
<!-- Start/End (rounded rect) -->
<rect x="350" y="50" width="100" height="50" rx="25" class="start-end"/>
<text x="400" y="80" text-anchor="middle">Start</text>

<!-- Process box -->
<rect x="350" y="150" width="100" height="60" class="process"/>
<text x="400" y="185" text-anchor="middle">Process</text>

<!-- Decision diamond -->
<path d="M400,250 L450,280 L400,310 L350,280 Z" class="decision"/>
<text x="400" y="285" text-anchor="middle">Decision?</text>

<!-- Arrow -->
<path d="M400,100 L400,150" stroke="#666" stroke-width="2" marker-end="url(#arrow)"/>

Workflow

  1. Break down process into steps
  2. Identify decision points
  3. Layout nodes vertically or horizontally
  4. Connect with arrows
  5. Add labels to decision branches
  6. Write to [process]-flowchart.html

Keep layout clean, use consistent spacing (100px between nodes).

© mhattingpete, Apache-2.0. 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 4 other files (references, assets) in visual-documentation-plugin/skills/flowchart-creator of mhattingpete/claude-skills-marketplace.

  • SKILL.md
  • assets/templates/base_template.html
  • assets/templates/flowchart_components.html
  • references/design_patterns.md
  • references/svg_library.md

Open the folder on GitHubat commit b5b34bc

Compare with similar skills

Flowchart Creator 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.

Flowchart Creator compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Flowchart Creator this skillmhattingpete/claude-skills-marketplace680—~518Automated safety check: PassApache-2.0
Archify Diagramstt-a1i/archify79k—~2.9kAutomated safety check: PassMIT
JSON Canvasheyitsnoah/claudesidian2.6k18 repos~3.5kAutomated safety check: PassMIT
Diagram Designcathrynlavery/diagram-design45k1 repos~7.5kAutomated safety check: PassMIT
Fireworks Tech Graphtisfeng/Easydict15k1 repos~1.4kAutomated safety check: PassMIT
Excalidraw Diagramcoleam00/excalidraw-diagram-skill5k2 repos~6.1kAutomated safety check: PassNone

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Categories

Questions about Flowchart Creator

What does Flowchart Creator do?

Create HTML flowcharts and process diagrams with decision trees, color-coded stages, arrows, and swimlanes. Flowchart Creator is an agent skill from mhattingpete/claude-skills-marketplace. Create HTML flowcharts and process diagrams with decision trees, color-coded stages, arrows, and swimlanes.

When should I use Flowchart Creator?

Flowchart Creator fits situations like: users request flowcharts; process diagrams; workflow visualizations.

How do I install Flowchart Creator in Claude Code?

Run `npx skills add mhattingpete/claude-skills-marketplace --skill flowchart-creator -a claude-code`. Or copy the skill folder (visual-documentation-plugin/skills/flowchart-creator in mhattingpete/claude-skills-marketplace) into .claude/skills/flowchart-creator in your project. Claude Code loads it when a task matches its description.

How do I install Flowchart Creator in Codex?

Run `npx skills add mhattingpete/claude-skills-marketplace --skill flowchart-creator -a codex`. Or copy the skill folder (visual-documentation-plugin/skills/flowchart-creator in mhattingpete/claude-skills-marketplace) into .agents/skills/flowchart-creator in your project. Codex loads it when a task matches its description.

Can I use Flowchart Creator 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 mhattingpete/claude-skills-marketplace --skill flowchart-creator -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/flowchart-creator, .gemini/skills/flowchart-creator, .github/skills/flowchart-creator and .opencode/skills/flowchart-creator in your project.

What does Flowchart Creator need to run?

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

Does Flowchart Creator 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 Flowchart Creator 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 Flowchart Creator use?

Flowchart Creator is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Flowchart Creator use?

About 518 tokens (SKILL.md is roughly 2.1k 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 7.1k tokens, read only when the agent opens those files.

What are the alternatives to Flowchart Creator?

Skills that share tags, products or a category with Flowchart Creator: Archify Diagrams (tt-a1i/archify, 79k stars), JSON Canvas (heyitsnoah/claudesidian, 2.6k stars), Diagram Design (cathrynlavery/diagram-design, 45k stars) and Fireworks Tech Graph (tisfeng/Easydict, 15k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Flowchart Creator?

mhattingpete (a GitHub user) maintains it in mhattingpete/claude-skills-marketplace, which has 680 GitHub stars. The repository holds 16 skills in this directory. The repository was last updated on July 25, 2026.

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