Utility Mermaid Diagrams

Q: Why use Utility Mermaid Diagrams on TypingMind?

Because you install it once and use it with any model. Utility Mermaid Diagrams is plain Markdown rather than provider-specific code, so the same skill runs on GPT-5, Claude, Gemini, Grok, or a local model — and you can switch model mid-chat without it breaking. TypingMind runs on your own API keys, so you pay providers directly instead of a per-seat subscription, and your skills and chats stay in your own storage.

Q: How do I install Utility Mermaid Diagrams in TypingMind?

Open Plugins → Skills → Install from GitHub in TypingMind and paste https://github.com/product-on-purpose/pm-skills/tree/main/skills/utility-mermaid-diagrams. TypingMind reads its SKILL.md and bundles its files and installs it as a skill you can enable per chat.

Q: Which AI models can use Utility Mermaid Diagrams?

Any model you connect in TypingMind. AI skills are plain Markdown instructions rather than provider-specific code, so GPT, Claude, Gemini, Grok, and local models can all load this skill when a request matches it.

Q: How many AI models can I use with Utility Mermaid Diagrams?

As many as you like. As long as a model supports skills, you can use Utility Mermaid Diagrams with it — GPT, Claude, Gemini, Grok, DeepSeek, Mistral, Llama and more — all on TypingMind with your own API keys.

Q: Is the Utility Mermaid Diagrams AI skill free?

Yes. It is published on GitHub by product-on-purpose under the Apache-2.0 license. You only pay your own AI provider for the tokens you use.

Q: What are AI skills?

An AI skill is a reusable instruction bundle that teaches an AI model how to do one specific task. It follows the open Agent Skills format: a SKILL.md file with a name and description, plus any scripts, templates or reference files the model may need. The model reads the instructions only when your request matches the skill, so an installed skill costs nothing until it is used.

Q: How are AI skills different from plugins or MCP servers?

A plugin or MCP server gives a model new tools to call — code that runs somewhere and returns a result. An AI skill gives the model knowledge and process instead: how to approach a task, which steps to follow, what good output looks like. Skills are plain Markdown, so they need no server, no API key and no runtime, and they work with any model.

Organization

product-on-purpose

utility-mermaid-diagrams

Teaches PMs to create syntactically valid mermaid diagrams by selecting the right diagram type for their communication need, following syntax validity rules, and validating before shipping. Covers all 15 mermaid diagram types with PM-relevant examples and a dual-lens navigation system.

Overview

Publisher	product-on-purpose
Repository	`pm-skills`
Skill name	`utility-mermaid-diagrams`
Stars	717
Forks	92
Bundled files	7
License	Apache-2.0
Links	Skill source Repository Homepage

Markdown instructions
A SKILL.md file the model loads on demand, so it only costs tokens when a request actually matches.
Works with any LLM
AI skills are plain Markdown, not provider-specific code, so this works with GPT, Claude, Gemini, Grok, or a local model.
7 bundled files
Scripts, templates, and references the model can read while it works. Files are read-only and never executed.
Open source
Published by product-on-purpose on GitHub. Read the source before you install it.

Installation

Install the Utility Mermaid Diagrams AI skill in TypingMind to use it with any LLM, or drop it into another agent that reads SKILL.md.

Install in TypingMind

TypingMind installs a skill straight from its GitHub folder — it reads SKILL.md, bundles the resource files, and stores the result locally.

Open the app and go to Plugins → Skills.
Choose "Install from GitHub".
Paste the skill folder URL below and confirm.
https://github.com/product-on-purpose/pm-skills/tree/main/skills/utility-mermaid-diagrams
Enable the skill in any chat where you want it available.

Store

Installed

Skills

Add skills

Import one or more skills from a public GitHub folder or a local .skill or .zip archive, or SKILL.md file.

From GitHub URLFrom .skill, .zip, or SKILL.md

GitHub repo or folder

https://github.com/product-on-purpose/pm-skills/tree/main/skills/utility-mermaid-diagrams

Points to a single skill folder, or any folder that contains multiple skills. Public repos only.

CancelContinue

Plugins → Skills → Add skill → From GitHub URL, then paste the folder URL and press Continue.

Install in another agent

Any agent that reads the Agent Skills format can use this skill — copy the folder into that agent's skills directory.

Claude Code — .claude/skills

git clone --depth 1 https://github.com/product-on-purpose/pm-skills.git /tmp/pm-skills
mkdir -p .claude/skills
cp -r /tmp/pm-skills/skills/utility-mermaid-diagrams .claude/skills/utility-mermaid-diagrams

Restart Claude Code after copying so it picks up the new skill.

Use it in TypingMind

Enable Utility Mermaid Diagrams in any TypingMind chat and the model takes it from there. Its name and description sit in the system prompt, and the moment a request matches, the model loads the full instructions itself — you never invoke it by hand, and it costs no tokens until it is actually used.

The model loads Utility Mermaid Diagrams on its own as soon as a request matches it.

Works with any AI model

AI skills are plain Markdown instructions rather than provider-specific code, so Utility Mermaid Diagrams is not tied to the model it was written for. Install it once in TypingMind and use it with GPT-5, Claude, Gemini, Grok, DeepSeek, Mistral, Llama, or a local model you run yourself — all on your own API keys.

Loaded only when it is needed
The system prompt carries just the name and description. The instructions are fetched on the first matching request, so an idle skill costs nothing.
Switch models mid-chat
Because the skill is instructions rather than code, changing model does not break it — the next model reads the same SKILL.md.

Skill instructions

This is the SKILL.md content the model loads. Read it before installing — a skill is instructions your model will follow.

Mermaid Diagrams

Create effective, syntactically valid mermaid diagrams for product documents.

When to Use

Creating mermaid diagrams for PRDs, specs, roadmaps, or stakeholder presentations
Choosing which of 15 diagram types fits a specific communication need
Debugging mermaid code that won't render or renders incorrectly
Reviewing diagrams for clarity, accuracy, and accessibility

When NOT to Use

Exporting diagrams to image files (PNG/SVG) - that's a rendering tool concern
Using non-mermaid diagramming tools (Figma, Lucidchart, draw.io)
Creating purely decorative visuals with no informational purpose
Producing a full customer-journey artifact (stages, touchpoints, emotional curve, pain points) rather than a standalone diagram - use discover-journey-map, which composes this skill for its timeline or flowchart section

The Cardinal Rule

Don't diagram what a list can say.

Diagrams earn their place when they reveal relationships, branching, or flow that prose flattens. Before creating any diagram, ask:

Does this show branching, relationships, or flow that a list or table would flatten?

Yes → proceed with a diagram
No → use a numbered list, bullet list, or table instead

A 5-step linear process is a list. A 5-step process with two decision points and a retry loop is a diagram.

Diagram Selection Guide

I need to show...	Use	Also consider
A decision or approval process	Flowchart	State
Multi-service or multi-party interactions	Sequence	Flowchart
Feature lifecycle or status transitions	State	Flowchart
Work stages or pipeline status	Kanban	State
Release or sprint timeline with dependencies	Gantt	Timeline
Version history or chronological milestones	Timeline	Gantt
2D prioritization (effort/impact, risk/value)	Quadrant	-
Allocation breakdown or composition	Pie	Treemap
Problem decomposition or brainstorming	Mindmap	-
Domain models or data relationships	ER	Class
API or object contracts	Class	ER
System topology or infrastructure	Architecture	Flowchart
Flow quantities or budget allocation	Sankey	Pie
Hierarchical proportional data	Treemap	Pie
Trends or time-series metrics	XY-Chart	-

For worked examples organized by PM task, see references/pm-use-cases.md. For full syntax and options per type, see references/diagram-catalog.md.

Syntax Validity Principles

Six rules that prevent most rendering failures:

Quote labels - Any label containing spaces, parentheses, brackets, colons, commas, or reserved words must be quoted with double quotes
Escape special characters - Characters with mermaid or markdown meaning (>, <, - at line start, #) need escaping or quoting
Declare before referencing - Define a node before using it in an edge; referencing an undeclared node causes silent failures in some types
Respect limits - Each diagram type has a maximum node/participant count beyond which readability collapses (see references/diagram-catalog.md for per-type limits)
Comment your intent - Use %% comments to document non-obvious choices (why this layout direction, why this grouping)
Test before shipping - Paste into a mermaid renderer (mermaid.live, VS Code preview, or your target environment) and verify it renders correctly

For the complete syntax reference, see references/syntax-guide.md.

Instructions

Identify what you're communicating - What relationship, flow, hierarchy, or proportion needs to be visible? Who is the audience?
Apply the cardinal rule - Confirm a diagram adds value over a list or table
Select a diagram type - Use the selection guide above, browse references/pm-use-cases.md by task, or browse references/diagram-catalog.md by type
Plan the diagram - Fill out the planning worksheet in references/TEMPLATE.md: purpose, audience, node inventory, type rationale
Write the mermaid code - Follow references/syntax-guide.md rules; start with the minimal syntax example from references/diagram-catalog.md and expand
Validate - Run through the quality checklist below
Embed - Place the validated mermaid code block in your document

Output Contract

Planning artifact: A completed diagram planning worksheet (references/TEMPLATE.md)
Final output: A syntactically valid mermaid code block embedded in the target document
Quality gate: All items in the quality checklist pass

Quality Checklist

References

File	Purpose
`references/TEMPLATE.md`	Diagram planning worksheet - fill out before writing mermaid code
`references/EXAMPLE.md`	Worked example: PM creating 4 diagrams for a product launch
`references/diagram-catalog.md`	All 15 diagram types: syntax, PM examples, limits, pitfalls
`references/pm-use-cases.md`	PM task → diagram type mapping with mini worked examples
`references/syntax-guide.md`	Complete syntax validity rules, escaping, styling, and validation checklist

Bundled files

The model reads these on demand while the skill is loaded. They are exposed as readable files and are never executed.

Frequently asked questions

What does the Utility Mermaid Diagrams AI skill do?

Why use Utility Mermaid Diagrams on TypingMind?

Because you install it once and use it with any model. Utility Mermaid Diagrams is plain Markdown rather than provider-specific code, so the same skill runs on GPT-5, Claude, Gemini, Grok, or a local model — and you can switch model mid-chat without it breaking. TypingMind runs on your own API keys, so you pay providers directly instead of a per-seat subscription, and your skills and chats stay in your own storage.

How do I install Utility Mermaid Diagrams in TypingMind?

Open Plugins → Skills → Install from GitHub in TypingMind and paste https://github.com/product-on-purpose/pm-skills/tree/main/skills/utility-mermaid-diagrams. TypingMind reads its SKILL.md and bundles its files and installs it as a skill you can enable per chat.

Which AI models can use Utility Mermaid Diagrams?

Any model you connect in TypingMind. AI skills are plain Markdown instructions rather than provider-specific code, so GPT, Claude, Gemini, Grok, and local models can all load this skill when a request matches it.

How many AI models can I use with Utility Mermaid Diagrams?

As many as you like. As long as a model supports skills, you can use Utility Mermaid Diagrams with it — GPT, Claude, Gemini, Grok, DeepSeek, Mistral, Llama and more — all on TypingMind with your own API keys.

Is the Utility Mermaid Diagrams AI skill free?

Yes. It is published on GitHub by product-on-purpose under the Apache-2.0 license. You only pay your own AI provider for the tokens you use.

What are AI skills?

An AI skill is a reusable instruction bundle that teaches an AI model how to do one specific task. It follows the open Agent Skills format: a SKILL.md file with a name and description, plus any scripts, templates or reference files the model may need. The model reads the instructions only when your request matches the skill, so an installed skill costs nothing until it is used.

How are AI skills different from plugins or MCP servers?

A plugin or MCP server gives a model new tools to call — code that runs somewhere and returns a result. An AI skill gives the model knowledge and process instead: how to approach a task, which steps to follow, what good output looks like. Skills are plain Markdown, so they need no server, no API key and no runtime, and they work with any model.

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Overview

Installation

Install in TypingMind

Install in another agent

Use it in TypingMind

Works with any AI model

Skill instructions

Mermaid Diagrams

When to Use

When NOT to Use

The Cardinal Rule

Diagram Selection Guide

Syntax Validity Principles

Instructions

Output Contract

Quality Checklist

References

Bundled files

Frequently asked questions

Related AI Skills

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