How does it handle large markdown files with many diagrams?

The skill features a Quick Mode that uses parallel workers to validate and fix multiple diagrams within a single markdown file concurrently.

Does it require any external dependencies?

Yes, this skill requires mermaid-cli (mmdc) to be installed in your environment to perform the actual validation and testing of diagrams.

What is the Mermaid-Fix skill?

It is a specialized capability for Claude Code that identifies and corrects syntax errors in Mermaid diagrams using mermaid-cli to ensure they render correctly.

Will this skill redesign my diagrams?

No, the skill is strictly focused on fixing syntax and structural errors that prevent rendering. It does not alter the visual design or layout logic.

Can I add custom rules for diagram fixing?

Yes, the skill reads from and updates .claude/rules/mermaid.md, allowing you to define and persist specific patterns and fixes for your project.

Mermaid Diagram Validator & Fixer

Name: Mermaid Diagram Validator & Fixer
Author: jinbangyi

byjinbangyi

Learning & Documentation

Validates and repairs Mermaid syntax errors automatically using mermaid-cli to ensure flawless diagram rendering in documentation.

About

The Mermaid-Fix skill provides a robust framework for managing Mermaid diagrams within your codebase. It utilizes the mermaid-cli (mmdc) to perform real-time syntax validation, identify parsing errors, and apply automated fixes for common issues like case sensitivity, illegal HTML tags, and naming convention violations. By maintaining a local ruleset in .claude/rules/mermaid.md, the skill dynamically learns from new error patterns, ensuring that AI-generated or manually edited diagrams always meet rendering standards. It is particularly useful for technical writers and developers who rely on diagrams for system architecture, sequence flows, and state machines.

Key Features

Automated syntax validation via mermaid-cli (mmdc) integration
Concurrent batch processing for multiple diagrams within markdown files
Self-learning rule engine that updates local documentation with new fix patterns
Intelligent correction of common syntax errors like case sensitivity and tag usage
Semantic preservation to ensure diagram logic remains unchanged during fixes
0 GitHub stars

Use Cases

Repairing broken Mermaid diagrams in technical documentation after AI generation or manual edits
Automating the validation of architecture diagrams during CI/CD or pre-commit checks
Enforcing consistent diagram syntax and naming standards across large scale projects

About

Key Features

Automated syntax validation via mermaid-cli (mmdc) integration
Concurrent batch processing for multiple diagrams within markdown files
Self-learning rule engine that updates local documentation with new fix patterns
Intelligent correction of common syntax errors like case sensitivity and tag usage
Semantic preservation to ensure diagram logic remains unchanged during fixes
0 GitHub stars

Use Cases

Repairing broken Mermaid diagrams in technical documentation after AI generation or manual edits
Automating the validation of architecture diagrams during CI/CD or pre-commit checks
Enforcing consistent diagram syntax and naming standards across large scale projects