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 Zate/cc-plugins --skill mermaidgit clone --depth 1 https://github.com/Zate/cc-pluginsWrote 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/zate/cc-plugins/mermaid)<a href="https://agentmods.dev/skills/zate/cc-plugins/mermaid"><img src="https://agentmods.dev/badge/skills/zate/cc-plugins/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/zate/cc-plugins/mermaid"><img src="https://agentmods.dev/badge/skills/zate/cc-plugins/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 | $0.00062 | $0.01685 |
| Opus 5.5 | $0.00025 | $0.00674 |
| Sonnet 5.5 | $0.00012 | $0.00337 |
| Haiku 4.5 | $0.00006 | $0.00169 |
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.
How it starts
The opening of the file, as written. The whole thing — 220 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Mermaid Diagram Skill
Generate diagrams using Mermaid's Markdown-inspired syntax. Mermaid is the most token-efficient and LLM-reliable diagram format, with native rendering in GitHub, GitLab, Obsidian, Notion, and many documentation platforms.
When to use Mermaid:
- User explicitly asks for Mermaid format
- User wants inline-editable text diagrams in version control
- User wants to convert an existing SVG/diagram to a simpler text format
- Mermaid-specific types like Gantt, Sankey, or git graphs
When another format is better:
- Maximum visual quality and custom design (SVG)
- Informal whiteboard/sketch aesthetic (Excalidraw)
- Threat models, comparisons, Venn diagrams (SVG -- Mermaid lacks these types)
- Complex architecture with nested containers (D2)
Consult the design-system skill for color, composition, and quality rules.
Supported Diagram Types
| Type | Syntax Keyword | Best For |
|---|---|---|
| Flowchart | flowchart TD or flowchart LR |
Process flows, decision trees, pipelines |
| Sequence | sequenceDiagram |
API calls, request lifecycles, protocols |
| Class | classDiagram |
OOP design, domain models |
| State | stateDiagram-v2 |
Object lifecycles, state machines |
| ER Diagram | erDiagram |
Database schemas, data models |
| Gantt | gantt |
Project timelines, schedules |
| Mind Map | mindmap |
Topic hierarchies, brainstorming |
| Timeline | timeline |
Chronological events |
| Sankey | sankey-beta |
Volume/flow distribution |
| Pie | pie |
Simple proportions |
| Git Graph | gitGraph |
Branch/merge visualization |
| C4 Context | C4Context |
System context diagrams |
Syntax Quick Reference
Flowchart
flowchart TD
A[Start] --> B{Decision?}
B -->|Yes| C[Action A]
B -->|No| D[Action B]
C --> E[End]
D --> E
Direction: TD (top-down), LR (left-right), BT (bottom-top), RL (right-left).
Node shapes:
[text]-- rectangle(text)-- rounded rectangle{text}-- diamond (decision)([text])-- stadium/pill[[text]]-- subroutine[(text)]-- cylinder (database)((text))-- circle
What ships with it
4 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.
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 · 220 lines · 62 tokens per session scan A 5b4a304108d7
mermaid is a skill published in the GitHub repository Zate/cc-plugins (10 stars, last pushed 2mo ago), licensed MIT. It adds 62 tokens to every session and 1,685 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 2026-08-31.
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