A tool that turns written requirements into Mermaid diagram code. Mermaid is a text-based format for diagrams such as flowcharts, timelines, database relationships, and message sequences.

Use it to create flowcharts, sequence, class, state, entity-relationship, Gantt, pie, mind-map, timeline, and other supported diagrams.

It removes the need to manually work out diagram syntax when you already know what relationships or steps you want to show.

mermaid — Skill for Claude Code by quantumentangled-dev/ai-docs-plugin

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 quantumentangled-dev/ai-docs-plugin --skill mermaid

Clone the repo

git clone --depth 1 https://github.com/quantumentangled-dev/ai-docs-plugin

Made for: Claude Code.

Or install ai-docs, the plugin that ships this one along with the rest of its 7 skills, 2 agents, 2 hooks.

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/quantumentangled-dev/ai-docs-plugin/mermaid/github.svg)](https://agentmods.dev/skills/quantumentangled-dev/ai-docs-plugin/mermaid)

Your own site

<a href="https://agentmods.dev/skills/quantumentangled-dev/ai-docs-plugin/mermaid"><img src="https://agentmods.dev/badge/skills/quantumentangled-dev/ai-docs-plugin/mermaid/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/quantumentangled-dev/ai-docs-plugin/mermaid"><img src="https://agentmods.dev/badge/skills/quantumentangled-dev/ai-docs-plugin/mermaid.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 34 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 868 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 100% 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	$0.00034	$0.00868
Opus 5.5	$0.00014	$0.00347
Sonnet 5.5	$0.00007	$0.00174
Haiku 4.5	$0.00003	$0.00087

Measured 2mo ago against content hash 30ab197feb48, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

mermaid 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 2mo ago.

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

100% identical to mermaid — 0 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.

skills/mermaid/SKILL.md · 81 lines

How it starts

The opening of the file, as written. The whole thing — 81 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Mermaid Diagram Generator

Generate high-quality Mermaid diagram code based on user requirements.

Workflow

Understand Requirements: Analyze user description to determine the most suitable diagram type
Read Documentation: Read the corresponding syntax reference for the diagram type
Generate Code: Generate Mermaid code following the specification
Apply Styling: Apply appropriate themes and style configurations

Diagram Type Reference

Select the appropriate diagram type and read the corresponding documentation:

Type	Documentation	Use Cases
Flowchart	flowchart.md	Processes, decisions, steps
Sequence Diagram	sequenceDiagram.md	Interactions, messaging, API calls
Class Diagram	classDiagram.md	Class structure, inheritance, associations
State Diagram	stateDiagram.md	State machines, state transitions
ER Diagram	entityRelationshipDiagram.md	Database design, entity relationships
Gantt Chart	gantt.md	Project planning, timelines
Pie Chart	pie.md	Proportions, distributions
Mindmap	mindmap.md	Hierarchical structures, knowledge graphs
Timeline	timeline.md	Historical events, milestones
Git Graph	gitgraph.md	Branches, merges, versions
Quadrant Chart	quadrantChart.md	Four-quadrant analysis
Requirement Diagram	requirementDiagram.md	Requirements traceability
C4 Diagram	c4.md	System architecture (C4 model)
Sankey Diagram	sankey.md	Flow, conversions
XY Chart	xyChart.md	Line charts, bar charts
Block Diagram	block.md	System components, modules
Packet Diagram	packet.md	Network protocols, data structures
Kanban	kanban.md	Task management, workflows
Architecture Diagram	architecture.md	System architecture
Radar Chart	radar.md	Multi-dimensional comparison
Treemap	treemap.md	Hierarchical data visualization
User Journey	userJourney.md	User experience flows
ZenUML	zenuml.md	Sequence diagrams (code style)

Read the full file on GitHub · 81 lines

Files

What ships with it

34 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.

2mo ago First seen · 81 lines · 34 tokens per session scan A 30ab197feb48

Subscribe to this mod's changes

mermaid is a skill published in the GitHub repository quantumentangled-dev/ai-docs-plugin (6 stars, last pushed 5mo ago), licensed MIT. It adds 34 tokens to every session and 868 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 100% identical to mermaid, differing in 0 lines, and is treated as a copy.

Design and UX

mermaid next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
mermaidquantumentangled-dev/ai-docs-plugin	Skill	6	5mo ago	MIT	A	34	Claude Code
webgl-holographic-foilnexu-io/open-design	Skill	106k	yesterday	Apache-2.0	A	41	Claude Code, Codex
html-ppt-hermes-cyber-terminalnexu-io/open-design	Skill	106k	yesterday	Apache-2.0	A	53	Claude Code, Codex
html-ppt-taste-brutalistnexu-io/open-design	Skill	106k	yesterday	Apache-2.0	A	78	Claude Code, Codex
visual-ralphYeachan-Heo/oh-my-codex	Skill	34k	3d ago	MIT	A	52	Codex
glance-canonical-layoutsandroid/skills	Skill	10k	yesterday	Apache-2.0	A	56	Claude Code
accessibilitymicrosoft/hve-core	Skill	1.6k	yesterday	MIT	A	47	Claude Code