What is mermaid-tools?

A set of scripts that finds Mermaid diagram blocks in Markdown files and turns them into PNG images. Mermaid is a text format for describing diagrams such as flowcharts and dependency graphs.

Use it to extract every Mermaid diagram from a Markdown file, save each diagram as an .mmd file, and generate numbered PNG images.

It removes the manual work of copying diagrams out of documents and rendering them as image files.

mermaid-tools — Skill for Claude Code and Codex by seaworld008

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add seaworld008/Commonly-used-high-value-skills --skill mermaid-tools

Clone the repo

git clone --depth 1 https://github.com/seaworld008/Commonly-used-high-value-skills

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/seaworld008/commonly-used-high-value-skills/mermaid-tools/github.svg)](https://agentmods.dev/skills/seaworld008/commonly-used-high-value-skills/mermaid-tools)

Your own site

<a href="https://agentmods.dev/skills/seaworld008/commonly-used-high-value-skills/mermaid-tools"><img src="https://agentmods.dev/badge/skills/seaworld008/commonly-used-high-value-skills/mermaid-tools/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/seaworld008/commonly-used-high-value-skills/mermaid-tools"><img src="https://agentmods.dev/badge/skills/seaworld008/commonly-used-high-value-skills/mermaid-tools.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 27 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,307 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin 98% copy Near-identical to another mod in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00027	$0.01307
Opus 5	$0.00014	$0.00654
Sonnet 5	$0.00005	$0.00261
Haiku 4.5	$0.00003	$0.00131

Measured 5d ago against content hash 55b4bea0043d, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

mermaid-tools scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.

The scan reads SKILL.md. This mod also ships 2 executable files (scripts/extract_diagrams.py, scripts/extract-and-generate.sh), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

98% identical to mermaid-tools — 28 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

openclaw-skills/mermaid-tools/SKILL.md · 175 lines

How it starts

The opening of the file, as written. The whole thing — 175 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Mermaid Tools

Overview

This skill enables extraction of Mermaid diagrams from markdown files and generation of high-quality PNG images. The skill bundles all necessary scripts (extract-and-generate.sh, extract_diagrams.py, and puppeteer-config.json) in the scripts/ directory for portability and reliability.

Core Workflow

Standard Diagram Extraction and Generation

Extract Mermaid diagrams from a markdown file and generate PNG images using the bundled extract-and-generate.sh script:

cd ~/.claude/skills/mermaid-tools/scripts
./extract-and-generate.sh "<markdown_file>" "<output_directory>"

Parameters:

<markdown_file>: Path to the markdown file containing Mermaid diagrams
<output_directory>: (Optional) Directory for output files. Defaults to <markdown_file_directory>/diagrams

Example:

cd ~/.claude/skills/mermaid-tools/scripts
./extract-and-generate.sh "/path/to/document.md" "/path/to/output"

What the Script Does

Extracts all Mermaid code blocks from the markdown file
Numbers them sequentially (01, 02, 03, etc.) in order of appearance
Generates .mmd files for each diagram
Creates high-resolution PNG images with smart sizing
Validates all generated PNG files

Output Files

For each diagram, the script generates:

01-diagram-name.mmd - Extracted Mermaid code
01-diagram-name.png - High-resolution PNG image

The numbering ensures diagrams maintain their order from the source document.

Advanced Usage

Custom Dimensions and Scaling

Override default dimensions using environment variables:

cd ~/.claude/skills/mermaid-tools/scripts
MERMAID_WIDTH=1600 MERMAID_HEIGHT=1200 ./extract-and-generate.sh "<markdown_file>" "<output_directory>"

Available variables:

MERMAID_WIDTH (default: 1200) - Base width in pixels
MERMAID_HEIGHT (default: 800) - Base height in pixels
MERMAID_SCALE (default: 2) - Scale factor for high-resolution output

Read the full file on GitHub · 175 lines

Files

What ships with it

4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

5d ago Changed · -21 tokens per session 55b4bea0043d
9d ago First seen · 175 lines · 48 tokens per session scan A 68fafe0adeb1

Subscribe to this mod's changes

mermaid-tools is a skill published in the GitHub repository seaworld008/Commonly-used-high-value-skills (70 stars, last pushed 5d ago), licensed MIT. It adds 27 tokens to every session and 1,307 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. It is 98% identical to mermaid-tools, differing in 28 lines, and is treated as a copy.

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