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 antoinebou12/uml-mcp --skill uml-mcp-diagramsgit clone --depth 1 https://github.com/antoinebou12/uml-mcpWrote 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/antoinebou12/uml-mcp/uml-mcp-diagrams)<a href="https://agentmods.dev/skills/antoinebou12/uml-mcp/uml-mcp-diagrams"><img src="https://agentmods.dev/badge/skills/antoinebou12/uml-mcp/uml-mcp-diagrams/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/antoinebou12/uml-mcp/uml-mcp-diagrams"><img src="https://agentmods.dev/badge/skills/antoinebou12/uml-mcp/uml-mcp-diagrams.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Agent Snooping · line 10 Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
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 | $0.00083 | $0.03284 |
| Opus 5 | $0.00042 | $0.01642 |
| Sonnet 5 | $0.00017 | $0.00657 |
| Haiku 4.5 | $0.00008 | $0.00328 |
Grade A, and why
uml-mcp-diagrams 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 7d 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 — 160 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Maintainers: Keep tool tables and
output_dirwording aligned with the Smithery bundle uml-skill/SKILL.md (diagramming-uml) and the Claude Code plugin skillplugins/uml-mcp/skills/uml-diagrams/SKILL.mdwhen you edit any of them.
uml-mcp diagram workflow
Goal
Turn the user’s intent into valid diagram_type + source code, call generate_uml (or generate_uml_image for chat-visible pictures), and surface the url (and playground when present). Prefer URL-first output (omit output_dir / use null) unless the user explicitly asks to save a file. When the user asks to show the diagram in chat, prefer generate_uml_image with output_format: png.
Positive patterns (do)
- Confirm types first when unsure: read
uml://types/uml://formatsor calllist_diagram_typesbeforegenerate_uml. Catalog includes ~37 Kroki-backed types (includinggoat,umlet). - Match
diagram_typeto the language ofcode(e.g. Mermaid body →mermaid; PlantUML with@startuml→plantumlor the specific Kroki PlantUML subtype if applicable). - Use
validate_umlbefore an expensive retry loop or when the user pastes untrusted LLM output. Preferstrict: truefor Mermaid sequence diagrams. - Mermaid sequence: put each statement on its own line. Do not pack
sequenceDiagram; participant A; A->>B: hion one line — strict validation rejects that; flowcharts may still use end-of-statement;. - Return
url,playground, and a short copy ofcodeevery time. Always format them as markdown links in the chat reply (see reply template). Never omit Playground when the tool returned it. - For inline chat images, call
generate_uml_image(pngdefault). It fetches bytes even on hosted Vercel whenMCP_URL_ONLYis on.generate_umlwithoutput_format: png/jpegalso force-fetches. Tool text includes, URL:, and Playground: for clients that do not attach ImageContent. - When an LLM produces the diagram text first, prefer fenced or raw source that downstream tools accept; strip ``` fences from pasted input when needed, but still prefer clean DSL without prose inside the diagram.
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.
- 7d ago Changed · +44 lines · +14 tokens per session 12e5085387f5
- 12d ago First seen · 116 lines · 69 tokens per session scan A be872759dbb8
uml-mcp-diagrams is a skill published in the GitHub repository antoinebou12/uml-mcp (99 stars, last pushed yesterday), licensed MIT. It adds 83 tokens to every session and 3,284 once invoked, about $0.0004 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 2026-08-30.
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