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.
npx skills add veelenga/preview-skills --skill preview-mermaidgit clone --depth 1 https://github.com/veelenga/preview-skillsWrote 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.
[](https://agentmods.dev/skills/veelenga/preview-skills/preview-mermaid)<a href="https://agentmods.dev/skills/veelenga/preview-skills/preview-mermaid"><img src="https://agentmods.dev/badge/skills/veelenga/preview-skills/preview-mermaid/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.
<a href="https://agentmods.dev/skills/veelenga/preview-skills/preview-mermaid"><img src="https://agentmods.dev/badge/skills/veelenga/preview-skills/preview-mermaid.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00025 | $0.01204 |
| Opus 5 | $0.00013 | $0.00602 |
| Sonnet 5 | $0.00005 | $0.00241 |
| Haiku 4.5 | $0.00003 | $0.00120 |
Grade A, and why
preview-mermaid 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.
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.
How it starts
The opening of the file, as written. The whole thing — 230 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Preview Mermaid Skill
Interactive Mermaid diagram viewer that renders flowcharts, sequence diagrams, class diagrams, ER diagrams, state diagrams, Gantt charts, pie charts, and more.
Agent Usage
When the user asks to preview a Mermaid diagram, DO NOT build HTML manually. Use the Bash tool to execute this skill's run.sh script:
# Preview a file
./run.sh diagram.mmd
# Pipe content
echo "graph TD
A-->B" | ./run.sh
The script handles all HTML generation and automatically opens the result in the browser. Do NOT open the file manually to avoid duplicate tabs.
Usage
# Preview a Mermaid diagram file
/preview-mermaid diagram.mmd
# Pipe Mermaid content (preferred for temporary content)
cat flowchart.mermaid | /preview-mermaid
echo "graph TD\n A-->B" | /preview-mermaid
# With custom background color
/preview-mermaid sequence.mmd --background "#ffffff"
Best Practice: For temporary or generated content, prefer piping over creating temporary files. This avoids cluttering your filesystem and the content is automatically cleaned up.
Options
The script works with sensible defaults but supports these flags for flexibility:
-o, --output PATH- Custom output path--no-browser- Skip browser, output file path only
Features
- All diagram types supported:
- Flowcharts
- Sequence diagrams
- Class diagrams
- State diagrams
- ER diagrams (Entity-Relationship)
- Gantt charts
- Pie charts
- Git graphs
- User journey diagrams
- Requirement diagrams
- Interactive diagrams with clickable nodes
- Pan and zoom for large diagrams
- Export to SVG functionality
- Light/dark theme support
- Auto-layout for optimal diagram rendering
- Responsive design adapts to screen size
When to Use This Skill
Use this skill when the user wants to:
- Visualize flowcharts and process diagrams
- Create sequence diagrams for system interactions
- Document software architecture with class diagrams
- Design database schemas with ER diagrams
- Plan projects with Gantt charts
- Share visual documentation
What ships with it
11 files 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.
- config.sh 1.1 KB runs code
- lib/browser-utils.sh 9.5 KB runs code
- lib/content-utils.sh 6.7 KB runs code
- lib/html-generator.sh 14 KB runs code
- run.sh 7.5 KB runs code
- templates/scripts/common-ui.js 5.1 KB runs code
- templates/scripts/mermaid-renderer.js 3.7 KB runs code
- templates/scripts/utils.js 1.8 KB runs code
- templates/styles/common.css 1.6 KB
- templates/styles/diagram.css 959 B
- templates/styles/layout.css 14 KB
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 · 230 lines · 25 tokens per session scan A 6482f79870c8
preview-mermaid is a skill published in the GitHub repository veelenga/preview-skills (8 stars, last pushed 1mo ago), licensed MIT. It adds 25 tokens to every session and 1,204 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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