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mermaid-validator

Validate mermaid diagrams in markdown files for syntactical correctness.

7|Updated Feb 4, 2026
Search Tags:#code review#documentation#markdown#mermaid#validation#diagrams
One-click install
npx skills add https://github.com/aresbit/OpenMateCode --skill mermaid-validator-aresbit
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: mermaid-validator
Source: https://github.com/aresbit/OpenMateCode/tree/main/skills/mermaid-validator
Command: npx skills add https://github.com/aresbit/OpenMateCode --skill mermaid-validator-aresbit

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires mmdc, and includes scripts (resource) components.

What problem does it solve?

This Skill ensures that mermaid diagrams within markdown files are syntactically correct and render properly, preventing broken visualizations.

Core Features & Use Cases

  • Automatic Validation: Checks mermaid diagrams whenever they are created or edited.
  • Error Reporting: Clearly communicates any syntax errors found in the diagrams.
  • Automated Fixing: Attempts to correct identified issues to ensure diagrams are valid.
  • Use Case: When a developer adds a new flowchart to the project documentation, this skill automatically verifies its correctness before the documentation is finalized.

Quick Start

Validate the mermaid diagram in the file named 'flowchart.md'.

Frequently Asked Questions about mermaid-validator

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I validate mermaid diagrams in markdown files before committing documentation?▼

You can validate mermaid diagrams in markdown files by running an automated check that verifies syntactical correctness whenever diagrams are created or edited, ensuring visual integrity before finalizing documentation.

What is the best way to automatically fix syntax errors in mermaid flowcharts?▼

To automatically fix syntax errors in mermaid flowcharts, use a validation tool that reports errors clearly and attempts to correct identified issues to ensure diagrams render properly.

Do I need the mmdc command-line tool to check mermaid syntax in markdown?▼

Yes, you need the 'mmdc' command-line tool to validate mermaid syntax in markdown files, as the validation and SVG generation processes depend on it to ensure visual integrity.

Can I check if a mermaid diagram will render properly without rendering it manually?▼

You can check if a mermaid diagram will render properly by running an automated validation process that checks the diagram's syntax and attempts to correct any identified issues automatically.

Why does my mermaid diagram show a syntax error when I add a new flowchart to markdown?▼

A mermaid diagram shows a syntax error when added to markdown because the diagram's code violates mermaid syntax rules, which a validator can detect, report clearly, and attempt to fix automatically.

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