mermaid-optimize

Design

Improve readability, consistency, and completeness of Mermaid diagrams. Use when Claude needs to optimize Mermaid diagrams for visual clarity, better layout, missing components, or standardization across files. This skill enhances diagram quality while preserving the original architecture and meaning.

QUICK START

How to use this skill

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Prompt to paste

I want to install this Agent Skill for this project in Codex.

Source SKILL.md: https://github.com/majiayu000/claude-skill-registry/blob/HEAD/skills/data/mermaid-optimize/SKILL.md

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Copying this prompt does not install or run the skill. Review third-party files before use. Codex skill guide

Mermaid Diagram Optimizer

Optimize Mermaid diagrams for improved readability, consistency, and completeness.

Quick Start

Read the target file(s) containing Mermaid diagrams
For each diagram, apply optimization rules:
- Simplify layouts and reduce edge crossings
- Use consistent directional flow (LR or TD)
- Group related components with subgraphs
- Add missing components (databases, queues, auth services, etc.)
- Standardize naming conventions and styles
Replace optimized diagrams in source file(s)

Optimization Goals

1. Visual Clarity

Simplify layouts to reduce complexity
Minimize edge crossings
Use consistent directional flow (prefer LR or TD)
Break large diagrams into logical sections

2. Layout and Grouping

Group related components using subgraph with clear labels
Keep similar component types aligned
Avoid overcrowding nodes

3. Add Missing Components

Identify implied but missing components:

Databases
Queues / message brokers
Auth / identity services
External clients or APIs
Monitoring / logging components

Add only when logically required by existing connections or labels.

4. Style Standardization

Use consistent diagram types (graph, sequenceDiagram, stateDiagram)

Use semantic node IDs with readable labels:

graph LR
  api[API Service]
  db[(Database)]

Standardize capitalization and spacing
Use consistent arrow styles and directions

5. Mermaid Best Practices

Always use explicit direction: graph LR, graph TD
Avoid overly long node labels
Keep one responsibility per node
Use widely supported Mermaid syntax only

Constraints

Preserve the original meaning and architecture
Do not remove existing components unless they are redundant duplicates
Do not change non-Mermaid content
Output valid Mermaid syntax only

Example Before/After

Before:

graph
  App-->DB
  Auth-->App
  Client-->App
  Queue-->Worker
  Worker-->DB

After:

graph LR
  subgraph Clients
    client[Web Client]
  end

  subgraph Application
    api[API Service]
    auth[Auth Service]
  end

  subgraph Data
    db[(Database)]
    queue[(Message Queue)]
  end

  subgraph Workers
    worker[Background Worker]
  end

  client --> api
  api --> auth
  api --> db
  api --> queue
  queue --> worker
  worker --> db

Notes

This skill focuses on optimization and improvement, not syntax fixing
For parsing errors and syntax issues, use the /mermaid-fix skill instead
Always validate diagrams after optimization using mmdc