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 curiositech/some_claude_skills --skill mermaid-graph-writergit clone --depth 1 https://github.com/curiositech/some_claude_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/curiositech/some_claude_skills/mermaid-graph-writer)<a href="https://agentmods.dev/skills/curiositech/some_claude_skills/mermaid-graph-writer"><img src="https://agentmods.dev/badge/skills/curiositech/some_claude_skills/mermaid-graph-writer/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/curiositech/some_claude_skills/mermaid-graph-writer"><img src="https://agentmods.dev/badge/skills/curiositech/some_claude_skills/mermaid-graph-writer.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 | $0.00111 | $0.02427 |
| Opus 5 | $0.00056 | $0.01213 |
| Sonnet 5 | $0.00022 | $0.00485 |
| Haiku 4.5 | $0.00011 | $0.00243 |
Grade A, and why
mermaid-graph-writer 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 8d 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 — 297 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Mermaid Graph Writer
Writes precise, well-structured Mermaid diagrams. Selects the optimal diagram type for the content, uses correct syntax, and produces diagrams that are readable by both humans (rendered) and agents (text DSL).
When to Use
✅ Use for:
- Creating any Mermaid diagram from a description or data
- Choosing the right diagram type for a visualization need
- Refactoring prose decision trees into Mermaid flowcharts
- Modeling system architectures, protocols, state machines, data models
- Encoding temporal knowledge as timeline diagrams
❌ NOT for:
- Rendering/exporting Mermaid to PNG/SVG/PDF (use
mermaid-graph-renderer) - ASCII art or Unicode box-drawing (use
diagramming-expert) - GUI-based design tools (Figma, etc.)
Diagram Type Selection
flowchart TD
A{What are you modeling?} -->|Branching logic| B[flowchart]
A -->|Request/response over time| C[sequenceDiagram]
A -->|States and transitions| D[stateDiagram-v2]
A -->|Entities and relationships| E[erDiagram]
A -->|Chronological evolution| F[timeline]
A -->|Concept hierarchy| G[mindmap]
A -->|Time-sequenced tasks| H[gantt]
A -->|Proportions| I[pie]
A -->|2-axis comparison| J[quadrantChart]
A -->|Branch/merge history| K[gitGraph]
A -->|Type hierarchy / OO| L[classDiagram]
A -->|User experience steps| M[journey]
A -->|Quantity flows| N[sankey-beta]
A -->|Numeric data| O[xychart-beta]
A -->|System components| P[block-beta]
A -->|Infrastructure| Q[architecture-beta]
A -->|Task board| R[kanban]
A -->|Requirements traceability| S[requirementDiagram]
A -->|System context / containers| T[C4Context]
A -->|Protocol packets / headers| U[packet-beta]
A -->|Multi-axis comparison| V[radar]
A -->|Hierarchical proportions| W[treemap]
A -->|Code-style sequences| X[zenuml]
Quick Reference
| Content | Type | Direction |
|---|---|---|
| Decision tree / process | flowchart TD |
Top-down for decisions, LR for processes |
| API protocol / agent comms | sequenceDiagram |
Always vertical (implicit) |
| Lifecycle / status machine | stateDiagram-v2 |
Automatic layout |
| Database / data model | erDiagram |
Automatic layout |
| "What changed when" | timeline |
Horizontal chronological |
| Taxonomy / brainstorm | mindmap |
Radial from root |
| Project schedule | gantt |
Horizontal timeline |
| Category proportions | pie |
Circular |
| Effort vs. impact | quadrantChart |
2D scatter |
| Git branching strategy | gitGraph |
Horizontal |
| Class/interface hierarchy | classDiagram |
Automatic |
| User flow with satisfaction | journey |
Horizontal sections |
| Flow quantities between categories | sankey-beta |
Left-to-right flow |
| Bar/line charts | xychart-beta |
Standard axes |
| System block layout | block-beta |
Grid-based |
| Cloud/infra topology | architecture-beta |
Grouped services |
| Task status columns | kanban |
Column-based |
| Requirements traceability | requirementDiagram |
Automatic layout |
| System context / containers | C4Context / C4Container |
Layered (5 sub-types) |
| Protocol packets / headers | packet-beta |
Horizontal bit layout |
| Multi-axis scoring | radar |
Radial axes |
| Hierarchical proportions | treemap |
Nested rectangles |
| Code-style sequences | zenuml |
Vertical (plugin) |
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.
- 8d ago First seen · 297 lines · 111 tokens per session scan A 7228e3d8172b
mermaid-graph-writer is a skill published in the GitHub repository curiositech/some_claude_skills (221 stars, last pushed 5d ago), licensed MIT. It adds 111 tokens to every session and 2,427 once invoked, about $0.0006 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 2026-09-03.
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