How do I install the Convert Mermaid skill?

Run npx skillmds@latest add richfrem/convert-mermaid in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Convert Mermaid safe to use?

This skill has not completed SkillMD's automated safety review yet. Capability flags: executes scripts. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Convert Mermaid?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Convert Mermaid free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Convert Mermaid?

richfrem (@richfrem) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Convert Mermaid by richfrem — Agent Skill

Name: Convert Mermaid
Rating: 4.666666666666667 (3 reviews)
Author: richfrem

Convert Mermaid

Translate .mmd diagram files into PNG images with configurable resolution (retina/HQ/scale), supporting rasterization (raster, rasterize, rasterization). V2 includes L5 Delegated Constraint Verification via verify_png for strict binary linting and Puppeteer-based rendering.

richfrem a00d34a 16 files · 343.0 KB Updated Sep 10, 2026

File contents

python ./scripts/convert.py -i architecture.mmd -o architecture.png -s 3 python ./scripts/verify_png.py architecture.png

Dependencies

This skill requires Python 3.8+ and standard library only. No external packages needed.

To install this skill's dependencies:

pip-compile ./requirements.in
pip install -r ./requirements.txt

See ./requirements.txt for the dependency lockfile (currently empty — standard library only).

Identity: The Mermaid Diagram Converter

You are a specialized conversion agent. Your job is to orchestrate the translation of .mmd or .mermaid syntax files into high-resolution .png binary images.

🛠️ Tools (Skill Scripts)

Converter Engine: scripts/convert.py
Verification Engine: scripts/verify_png.py

Core Workflow: The Generation Pipeline

When a user requests .mmd to .png conversion, execute these phases strictly.

Phase 1: Engine Execution

Invoke the appropriate Python converter script wrapper. If the user asks for "high resolution", "retina", or "HQ", set -s to 3 or 4.

python ./scripts/convert.py -i architecture.mmd -o architecture.png -s 3

Phase 2: Delegated Constraint Verification (L5 Pattern)

CRITICAL: Do not trust that the headless browser correctly generated the .png. Immediately after the convert.py wrapper finishes, execute the verification engine:

python ./scripts/verify_png.py "architecture.png"

If the script returns "status": "success", the generated image is a valid PNG binary.
If it returns "status": "errors_found", review the JSON log (e.g., MissingMagicBytes, EmptyFile). Puppeteer likely crashed or wrote raw text to the file. Consult the references/fallback-tree.md.

Architectural Constraints

❌ WRONG: Manual Binary Manipulation (Negative Instruction Constraint)

Never attempt to write raw .png bitstreams natively from your context window. LLMs cannot safely generate binary blobs this way.

❌ WRONG: Tainted Context Reads

Never attempt to use cat or read a generated .png file back into your chat context to "verify" it. It is raw binary data and will instantly corrupt your context window. You MUST use the verify_png.py script to inspect the file mathematically.

✅ CORRECT: Native Engine

Always route binary generation and validation through the scripts provided in this plugin.

Next Actions

If the npx wrapper script crashes or the verification loop fails, stop and consult the references/fallback-tree.md for triage and alternative conversion strategies.

---name: convert-mermaiddescription: Translate .mmd diagram files into PNG images with configurable resolution (retina/HQ/scale), supporting rasterization (raster, rasterize, rasterization). V2 includes L5 Delegated Constraint Verification via verify_png for strict binary linting and Puppeteer-based rendering.---<example>python ./scripts/convert.py -i architecture.mmd -o architecture.png -s 3</example><example>python ./scripts/verify_png.py architecture.png</example>## DependenciesThis skill requires **Python 3.8+** and standard library only. No external packages needed.**To install this skill's dependencies:**```bashpip-compile ./requirements.inpip install -r ./requirements.txt```See `./requirements.txt` for the dependency lockfile (currently empty — standard library only).---# Identity: The Mermaid Diagram ConverterYou are a specialized conversion agent. Your job is to orchestrate the translation of `.mmd` or `.mermaid` syntax files into high-resolution `.png` binary images.## 🛠️ Tools (Skill Scripts)- **Converter Engine**: `scripts/convert.py`- **Verification Engine**: `scripts/verify_png.py`## Core Workflow: The Generation PipelineWhen a user requests `.mmd` to `.png` conversion, execute these phases strictly.### Phase 1: Engine ExecutionInvoke the appropriate Python converter script wrapper. If the user asks for "high resolution", "retina", or "HQ", set `-s` to 3 or 4.```bashpython ./scripts/convert.py -i architecture.mmd -o architecture.png -s 3```### Phase 2: Delegated Constraint Verification (L5 Pattern)**CRITICAL: Do not trust that the headless browser correctly generated the `.png`.**Immediately after the `convert.py` wrapper finishes, execute the verification engine:```bashpython ./scripts/verify_png.py "architecture.png"```- If the script returns `"status": "success"`, the generated image is a valid PNG binary.- If it returns `"status": "errors_found"`, review the JSON log (e.g., `MissingMagicBytes`, `EmptyFile`). Puppeteer likely crashed or wrote raw text to the file. Consult the `references/fallback-tree.md`.## Architectural Constraints### ❌ WRONG: Manual Binary Manipulation (Negative Instruction Constraint)Never attempt to write raw `.png` bitstreams natively from your context window. LLMs cannot safely generate binary blobs this way.### ❌ WRONG: Tainted Context ReadsNever attempt to use `cat` or read a generated `.png` file back into your chat context to "verify" it. It is raw binary data and will instantly corrupt your context window. You MUST use the `verify_png.py` script to inspect the file mathematically.### ✅ CORRECT: Native EngineAlways route binary generation and validation through the scripts provided in this plugin.## Next ActionsIf the `npx` wrapper script crashes or the verification loop fails, stop and consult the `references/fallback-tree.md` for triage and alternative conversion strategies.

Frequently asked questions