ClaudSkills / Engineering / code-quality

Mermaid Sequence Diagrams

Q: What is a Claude Code skill and how does the Mermaid Sequence Diagrams skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Mermaid Sequence Diagrams is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Engineering category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: Engineering · Sub-category: code-quality · Last updated: 2026-05-21

type:review

Generates, reviews, and fixes Mermaid-only sequence diagrams following syntax rules and best practices. Use when creating Mermaid sequence diagrams from system descriptions, reviewing existing Mermaid sequence diagrams for correctness, fixing parse errors, or refactoring large Mermaid sequence diagrams into focused sub-diagrams. Covers participants, arrows, activations, control flow, notes, styling, and common anti-patterns.

About this skill (catalog notes)

Mermaid Sequence Diagrams includes at least one code block. The SKILL.md runs to about 646 words, in the catalog's typical mid-range.

Original author: msewell
Indexed lastmod: 2026-05-21
Catalog position: Engineering · code-quality
Indexed related skills: 10

How Mermaid Sequence Diagrams fits the catalog

Mermaid Sequence Diagrams sits in the Engineering category under the code-quality sub-topic in the ClaudSkills catalog. There are 10 related skills indexed alongside it; comparing a few before installing usually reveals which fits your workflow best.

These notes are auto-generated from features detected in the SKILL.md file and from this catalog's structure — they aren't part of the source repository.

From the source SKILL.md

Generate, review, and fix Mermaid sequence diagrams that are syntactically correct, visually clear, and follow established best practices.

What this skill does

Mermaid Sequence Diagrams is a community-contributed Claude Code skill in the code-quality sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/mermaid-sequence-diagrams/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when creating Mermaid sequence diagrams from system descriptions, reviewing existing Mermaid sequence diagrams for correctness, fixing parse errors, or refactoring large Mermaid sequence diagrams into focused sub-diagrams. Covers participants, arrows, activations, control flow, notes, styling, and common anti-patterns.

Who uses this skill

The Mermaid Sequence Diagrams Claude Code skill is built for software engineers, backend developers, full-stack teams, and technical leads building and maintaining production systems. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 117,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/mermaid-sequence-diagrams
curl -L https://claudskills.com/skills/mermaid-sequence-diagrams/SKILL.md \
  -o ~/.claude/skills/mermaid-sequence-diagrams/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/mermaid-sequence-diagrams/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/mermaid-sequence-diagrams/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\mermaid-sequence-diagrams\SKILL.md on Windows. See the full install guide for step-by-step instructions.

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Mermaid Sequence Diagrams Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/mermaid-sequence-diagrams/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Mermaid Sequence Diagrams skill do?

Is this skill free to install?

Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.

When should I use the Mermaid Sequence Diagrams skill?

Use Mermaid Sequence Diagrams when your Claude Code task falls under the Engineering category — specifically in the code quality area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Mermaid Sequence Diagrams" or describe the task and let Claude pick). Browse related skills at /category/engineering/.

What is a Claude Code skill and how does the Mermaid Sequence Diagrams skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Mermaid Sequence Diagrams is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Engineering category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Source: https://github.com/msewell/agent-stuff/blob/HEAD/skills/mermaid-sequence-diagrams/SKILL.md
Author: msewell

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA

msewell. (2026). Mermaid Sequence Diagrams [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/mermaid-sequence-diagrams/

BibTeX

@misc{mermaid-sequence-diagrams-2026,
  author    = {msewell},
  title     = {Mermaid Sequence Diagrams [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/mermaid-sequence-diagrams/}
}

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Badge

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