What is mermaid-healer?

A repair tool for Mermaid diagrams, which are text descriptions that render as flowcharts and other diagrams in Markdown files.

It helps repair broken arrows, labels, brackets, comments, notes, and subgraphs in one or more files.

It fixes formatting mistakes that would otherwise stop a diagram from rendering.

mermaid-healer — Skill for Claude Code and Codex by Jacobinwwey

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 Jacobinwwey/notemdpro --skill mermaid-healer

Clone the repo

git clone --depth 1 https://github.com/Jacobinwwey/notemdpro

Made for: Claude Code, Codex.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/jacobinwwey/notemdpro/mermaid-healer/github.svg)](https://agentmods.dev/skills/jacobinwwey/notemdpro/mermaid-healer)

Your own site

<a href="https://agentmods.dev/skills/jacobinwwey/notemdpro/mermaid-healer"><img src="https://agentmods.dev/badge/skills/jacobinwwey/notemdpro/mermaid-healer/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/jacobinwwey/notemdpro/mermaid-healer"><img src="https://agentmods.dev/badge/skills/jacobinwwey/notemdpro/mermaid-healer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 29 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,929 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.

Model	Per session	Once invoked
Fable 5.1	$0.00029	$0.01929
Opus 5	$0.00015	$0.00964
Sonnet 5	$0.00006	$0.00386
Haiku 4.5	$0.00003	$0.00193

Measured 11d ago against content hash cbe2c50b9416, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

mermaid-healer 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 11d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (mermaidProcessor.ts), 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.

skills/mermaid-healer/SKILL.md · 292 lines

How it starts

The opening of the file, as written. The whole thing — 292 lines — stays where its author put it; the contents beside it link to each section on GitHub.

NoteMD Pro - Mermaid Diagram Fixing

Overview

This skill fixes Mermaid diagram syntax errors in markdown files. It includes comprehensive fixing logic for 20+ common Mermaid syntax issues including unquoted labels, malformed arrows, nested brackets, and more.

When to Use

Fix broken diagrams: Repair Mermaid syntax errors in notes
Auto-fix after generation: Automatically fix diagrams after LLM content generation
Batch repair: Fix multiple files at once

Function Call Chain

refineMermaidBlocks (mermaidProcessor.ts)
├── split content by lines
├── detect ```mermaid blocks
├── apply fix rules in order:
│   ├── fixSmartQuotes
│   ├── fixMermaidPipes
│   ├── fixMermaidNotes
│   ├── fixNotesToNodes
│   ├── fixMalformedArrows
│   ├── fixInvalidArrows
│   ├── mergeDoubleLabels
│   ├── fixMissingBrackets
│   ├── fixInlineSubgraphs
│   ├── fixMermaidComments
│   ├── fixDoubleSlashComments
│   ├── fixUnquotedNodeLabels
│   ├── fixIntermediateNodes
│   ├── fixDoubledID
│   ├── fixExcessiveBrackets
│   ├── fixSemicolonPositioning
│   ├── fixConcatenatedLabels
│   ├── fixUnquotedLabelsWithSemicolons
│   ├── enhancedNoteAndSemicolonCleanup
│   ├── fixReverseArrows
│   ├── fixSubgraphDirection
│   ├── fixDuplicateLabels
│   ├── fixNestedMermaidQuotes
│   ├── fixQuotedLabelsAfterSemicolon
│   ├── fixDoubleDashToArrow
│   ├── fixTargetedNotes
│   ├── fixDoubleArrowLabels
│   ├── fixUnquotedEdgeLabels
│   ├── fixShapeMismatch
│   ├── fixPlaceholderArtifacts
│   └── fixBlankArrows
├── close unclosed blocks
└── checkMermaidErrors (if errors found, apply deepDebugMermaid)

cleanupLatexDelimiters (mermaidProcessor.ts)
├── protect escaped dollars
├── convert \( \) to $
├── trim whitespace in math
└── restore escaped dollars

Code File

The full TypeScript code is available in: mermaidProcessor.ts

This file contains all the fix functions:

refineMermaidBlocks() - Main entry point
checkMermaidErrors() - Validate syntax
cleanupLatexDelimiters() - Fix LaTeX
deepDebugMermaid() - Apply all fix passes
20+ individual fix functions

Read the full file on GitHub · 292 lines

Files

What ships with it

1 file 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.

mermaidProcessor.ts 74 KB runs code

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.

11d ago First seen · 292 lines · 29 tokens per session scan A cbe2c50b9416

Subscribe to this mod's changes

mermaid-healer is a skill published in the GitHub repository Jacobinwwey/notemdpro (2 stars, last pushed 4mo ago), licensed MIT. It adds 29 tokens to every session and 1,929 once invoked, about $0.0001 per session on Opus 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.

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