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creating-mermaid-diagrams

creating-mermaid-diagrams is a skill for Claude Code from mdsakalu/agent-plugins. It costs 100 tokens per session (2,659 once invoked), scanned A, original, MIT.

A diagram-making skill for Mermaid, a text format that GitHub can render as flowcharts and other diagrams inside Markdown.

In plain words
What is it for?
Use it to create flowcharts, sequence diagrams, and other Mermaid diagram types, preview them locally, and check how they render on GitHub.
Why use it?
It helps you create diagrams that display correctly in pull requests, issues, comments, and Markdown files, while keeping structure and accessibility in mind.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: reads .claude/ paths; mentions Claude Code.

Part of the creating-mermaid-diagrams plugin — 1 skill shipped together

not rated 4repo 5mo ago A scan 100 tokens original MIT

Good fit Use it to create flowcharts, sequence diagrams, and other Mermaid diagram types, preview them locally, and check how they render on GitHub.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/mdsakalu/agent-plugins/creating-mermaid-diagrams
View source ↗ mdsakalu/agent-plugins
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 mdsakalu/agent-plugins --skill creating-mermaid-diagrams
Clone the repo
git clone --depth 1 https://github.com/mdsakalu/agent-plugins

Made for: Claude Code.

Or install creating-mermaid-diagrams, the plugin that ships this one along with the rest of its 1 skill.

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.

agentmods badge for creating-mermaid-diagrams

README.md
[![agentmods](https://agentmods.dev/badge/skills/mdsakalu/agent-plugins/creating-mermaid-diagrams/github.svg)](https://agentmods.dev/skills/mdsakalu/agent-plugins/creating-mermaid-diagrams)
Your own site
<a href="https://agentmods.dev/skills/mdsakalu/agent-plugins/creating-mermaid-diagrams"><img src="https://agentmods.dev/badge/skills/mdsakalu/agent-plugins/creating-mermaid-diagrams/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.

agentmods 80×15 button for creating-mermaid-diagrams

Your own site · 80×15
<a href="https://agentmods.dev/skills/mdsakalu/agent-plugins/creating-mermaid-diagrams"><img src="https://agentmods.dev/badge/skills/mdsakalu/agent-plugins/creating-mermaid-diagrams.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 100 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,659 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 original No closer match found 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00100 $0.02659
Opus 5.5 $0.00040 $0.01064
Sonnet 5.5 $0.00020 $0.00532
Haiku 4.5 $0.00010 $0.00266

Measured 2mo ago against content hash 75946f22c0dc, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

creating-mermaid-diagrams 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.

The scan reads SKILL.md. This mod also ships 2 executable files (scripts/preview.sh, scripts/theme-preview.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.

creating-mermaid-diagrams/skills/creating-mermaid-diagrams/SKILL.md · 287 lines

How it starts

The opening of the file, as written. The whole thing — 287 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Creating Mermaid Diagrams

Quick Start

Wrap mermaid in a fenced code block for GitHub:

```mermaid
flowchart TD
    A["Start"] --> B{"Decision"}
    B -->|Yes| C["Action"]
    B -->|No| D["Other Action"]
    C --> E["End"]
    D --> E

    classDef primary fill:#4493f8,stroke:#1f6feb,color:#fff
    classDef success fill:#3fb950,stroke:#238636,color:#fff
    classDef warning fill:#d29922,stroke:#9e6a03,color:#fff
    classDef danger fill:#f85149,stroke:#da3633,color:#fff

    class A primary
    class C success
    class D warning
    class E danger
```

Always include accTitle and accDescr for accessibility.

Design Philosophy

Start with structure. Add styling only where it earns its place. See references/style-guide.md for the full guide. The priority order:

  1. Structure -- Shapes carry meaning (diamonds=decisions, cylinders=storage, pills=terminals)
  2. Edge weight -- ==> for happy path, --> for standard, -.-> for optional/fallback
  3. Color -- Reinforces meaning, never carries it alone. Most nodes should be neutral.
  4. Emphasis -- stroke-width, dashed borders, emoji, bold labels -- only to solve specific problems

Workflow

  1. Choose diagram type -- Match the user's intent to a diagram type (see table below or references/diagram-types.md for full syntax)
  2. Write the diagram -- Use snake_case node IDs, quote reserved words, pick shapes that match meaning
  3. Apply styling -- Start with 0-1 colors. Add more only as the diagram demands. Pick a theme from references/themes.md as a palette menu.
  4. Preview -- Local SVG via preview.sh local or GitHub rendering via preview.sh gist
  5. Embed -- Place the fenced code block in the target markdown file

Choosing a Diagram Type

Use Case Diagram Type Keyword
Process flow, decision tree flowchart flowchart TD/LR
API call sequence, auth flow sequenceDiagram sequenceDiagram
Object model, inheritance classDiagram classDiagram
Lifecycle, transitions stateDiagram-v2 stateDiagram-v2
Database schema, relationships erDiagram erDiagram
Project timeline gantt gantt
Task board kanban kanban
Historical/event timeline timeline timeline
Distribution, proportions pie pie
2x2 matrix, positioning quadrantChart quadrantChart
Line/bar chart xychart-beta xychart-beta
Flow volume, allocation sankey-beta sankey-beta
Brainstorming, hierarchy mindmap mindmap
System context, containers C4Context C4Context
Infrastructure layout architecture-beta architecture-beta
Block layout block-beta block-beta
Git history visualization gitGraph gitGraph
Network packets packet-beta packet-beta
Requirements traceability requirementDiagram requirementDiagram

Read the full file on GitHub · 287 lines

Files

What ships with it

7 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.

  1. 2mo ago First seen · 287 lines · 100 tokens per session scan A 75946f22c0dc

Subscribe to this mod's changes

creating-mermaid-diagrams is a skill published in the GitHub repository mdsakalu/agent-plugins (4 stars, last pushed 5mo ago), licensed MIT. It adds 100 tokens to every session and 2,659 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Writing and docs
Related

creating-mermaid-diagrams compared with skills from other repositories

creating-mermaid-diagrams next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
creating-mermaid-diagramsmdsakalu/agent-pluginsSkill45mo agoMITA100Claude Code
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local-ai-agentsmicrosoft/ai-agents-for-beginnersSkill79kyesterdayMITA200Claude Code, Codex
playwright-climicrosoft/playwrightSkill100kyesterdayApache-2.0A19Claude Code
browser-automationopenclaw/openclawSkill394ktodayMITA36Claude Code
systematic-debuggingobra/superpowersSkill314k4d agoMITA21Claude Code
next-cache-components-adoptionvercel/next.jsSkill143ktodayMITA95Claude Code