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-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-diagrams)<a href="https://agentmods.dev/skills/antoinebou12/uml-mcp/uml-diagrams"><img src="https://agentmods.dev/badge/skills/antoinebou12/uml-mcp/uml-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-diagrams"><img src="https://agentmods.dev/badge/skills/antoinebou12/uml-mcp/uml-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 | $0.00069 | $0.01447 |
| Opus 5 | $0.00034 | $0.00724 |
| Sonnet 5 | $0.00014 | $0.00289 |
| Haiku 4.5 | $0.00007 | $0.00145 |
Grade A, and why
uml-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 — 98 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Maintainers: Canonical long-form copy also lives in
.skill/skills/uml-mcp-diagrams/SKILL.md. Keep tool tables andoutput_dirwording aligned with the Smithery bundle uml-skill.
UML-MCP in Claude Code
Goal
Produce valid diagram_type and DSL code, call generate_uml (or generate_uml_image to show a picture in chat), and give the user the url (and playground when present). Prefer URL-first output: omit output_dir / use null unless the user wants files on disk (local stdio only).
Do
- If
diagram_typeis unclear, uselist_diagram_typesor readuml://types/uml://formatsbefore generate_uml (~37 types, includinggoatandumlet). - Match
diagram_typeto the language ofcode(e.g. Mermaid body →mermaid;@startuml→plantumlor the specific Kroki PlantUML subtype when applicable). - Use
validate_umlbefore heavy retry loops or on pasted diagram source; usestrict: truefor Mermaid sequences. - Mermaid
sequenceDiagram: one statement per line — do not pack with;on a single line. - For inline chat images, call
generate_uml_imagewithpng(fetches bytes even when hostedMCP_URL_ONLYis on).generate_umlwithpng/jpegalso force-fetches; SVG replies include a markdown image URL in the tool text. - Return the
url,playground(as a markdown link when present), and a short copy ofcode. - Do not link local
output/*.pngpaths in chat; use MCP image content or the HTTPS URL.
Do not
- Invent
diagram_typeoroutput_format; confirm fromuml://types/uml://formatsorlist_diagram_types. - Put prose inside
code—only valid diagram DSL. - Set
output_dirunless the user asked for saved files (not applicable to the default HTTP deployment). - Pack Mermaid sequence statements with
;on one physical line. - Omit
playgroundwhen the tool returned it — always surface it as Playground: open editor.
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 · +29 lines · +14 tokens per session 962c3f737411
- 12d ago First seen · 69 lines · 55 tokens per session scan A 7ae0ab4d5c0b
uml-diagrams is a skill published in the GitHub repository antoinebou12/uml-mcp (99 stars, last pushed yesterday), licensed MIT. It adds 69 tokens to every session and 1,447 once invoked, about $0.0003 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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