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 ulises-jeremias/agent-toolkit --skill mermaidgit clone --depth 1 https://github.com/ulises-jeremias/agent-toolkitWrote 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/ulises-jeremias/agent-toolkit/mermaid)<a href="https://agentmods.dev/skills/ulises-jeremias/agent-toolkit/mermaid"><img src="https://agentmods.dev/badge/skills/ulises-jeremias/agent-toolkit/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/ulises-jeremias/agent-toolkit/mermaid"><img src="https://agentmods.dev/badge/skills/ulises-jeremias/agent-toolkit/mermaid.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00061 | $0.00475 |
| Opus 5.5 | $0.00024 | $0.00190 |
| Sonnet 5.5 | $0.00012 | $0.00095 |
| Haiku 4.5 | $0.00006 | $0.00047 |
Grade A, and why
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 1mo 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.
What it actually says
Mermaid — Primary Diagram Renderer (WHAT)
Sources (2026-08-12): mermaid-js/mermaid https://github.com/mermaid-js/mermaid MIT (Mermaid live editor https://mermaid.live); NPM mermaid 10.x MIT + @mermaid-js/mermaid 10.9.7-preview.41 MIT; docs/ARCHITECTURE.md already authors Mermaid natively.
Pack:
architecturecore (architect + ADR + TRD + threat-model + mermaid (+ C4)) — vendor-neutral.cloud-architectureoptional composescloud-design-patterns + aws-well-architected-review + mermaid. Seedocs/architecture/research-385-diagram.mdfor Mermaid vs C4 vs PlantUML/Structurizr/Excalidraw decision per §44.
When to use
- Need flowchart, sequence, class, ER, gantt, gitGraph — text → SVG/PNG.
- Threat-model data-flow / sequence diagrams.
Instructions
- Author Mermaid block in Markdown:
```mermaid+flowchart TD/sequenceDiagram/classDiagrametc. - Render via GitHub native or
mmdc -i diagram.mmd -o diagram.svg(mermaid CLI). - Collaborate with
architect+threat-model(data-flow) andc4-model(C4-inspired via Mermaid).
Anti-patterns
- Do not add Excalidraw/draw.io binary — use Mermaid text.
- Do not require PlantUML infra for basic diagrams.
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.
- 1mo ago First seen · 37 lines · 61 tokens per session scan A bd9c1c623d0c
mermaid is a skill published in the GitHub repository ulises-jeremias/agent-toolkit (19 stars, last pushed yesterday), licensed MIT. It adds 61 tokens to every session and 475 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-09-04.
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