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nomnoml

nomnoml is a skill for Claude Code, Codex from antoinebou12/uml-mcp. It costs 57 tokens per session (566 once invoked), scanned A, original, MIT.

A writing guide for nomnoml, a short notation for UML-style diagrams that show software structures and relationships.

In plain words
What is it for?
Use it to describe nodes, links, UML roles, and visual settings for class or system diagrams, then pass the source to the uml-mcp validation or image-generation tools.
Why use it?
It gives you the required syntax for nomnoml so an uml-mcp diagram tool can process the source correctly.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

not rated 109repo +1 yesterday A scan 57 tokens original MIT

Good fit Use it to describe nodes, links, UML roles, and visual settings for class or system diagrams, then pass the source to the uml-mcp validation or image-generation tools.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/antoinebou12/uml-mcp/nomnoml
View source ↗ antoinebou12/uml-mcp antoinebou12.github.io
Install

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.

Any agent
npx skills add antoinebou12/uml-mcp --skill nomnoml
Clone the repo
git clone --depth 1 https://github.com/antoinebou12/uml-mcp

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for nomnoml

README.md
[![agentmods](https://agentmods.dev/badge/skills/antoinebou12/uml-mcp/nomnoml/github.svg)](https://agentmods.dev/skills/antoinebou12/uml-mcp/nomnoml)
Your own site
<a href="https://agentmods.dev/skills/antoinebou12/uml-mcp/nomnoml"><img src="https://agentmods.dev/badge/skills/antoinebou12/uml-mcp/nomnoml/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.

agentmods 80×15 button for nomnoml

Your own site · 80×15
<a href="https://agentmods.dev/skills/antoinebou12/uml-mcp/nomnoml"><img src="https://agentmods.dev/badge/skills/antoinebou12/uml-mcp/nomnoml.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 57 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 566 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00057 $0.00566
Opus 5.5 $0.00023 $0.00226
Sonnet 5.5 $0.00011 $0.00113
Haiku 4.5 $0.00006 $0.00057

Measured 14d ago against content hash d2e2c8311877, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

nomnoml 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 14d 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.

.skill/skills/nomnoml/SKILL.md · 57 lines

What it actually says

nomnoml diagram (uml-mcp)

diagram_type: nomnoml
Backend: nomnoml
Output formats: svg

UML-style diagrams from shorthand syntax

Load the workflow skill uml-mcp-diagrams for URL-first replies, progressive discovery, and which MCP tool to call. This file is notation only; it does not add an MCP tool.

Notation tips

  • Directive lines start with # (#direction: down, #fill: #eee8d5, #stroke: #33322E, #lineWidth: 2, #padding: 12, #fontSize: 14).
  • Nodes are [Label]; edges ->, <->, --; classifiers [<actor> User], [<database> DB], [<package> P].
  • One vertical stack (#direction: down) reads better in chat thumbnails.
  • Prefer warm fill + dark stroke (Solarized-ish) so labels stay legible after PNG.

Styling

  • Directives: #fill, #stroke, #lineWidth, #fontSize, #padding.
  • No MCP theme param — set colors in the source.

Starter template

#direction: down
[A] -> [B]
[B] -> [C]

Example

#stroke: #33322E
#fill: #eee8d5
#direction: down
[Client] -> [UML MCP]
[UML MCP] -> [Kroki]
[Kroki] -> [Artifact]

Render with uml-mcp

  1. Set diagram_type to nomnoml exactly.
  2. Call validate_uml when the source is untrusted (prefer strict: true for Mermaid sequence).
  3. Call generate_uml, generate_uml_image (chat PNG), or generate_uml_batch.
  4. Pass theme when this skill's Themes section lists supported values.
  5. Surface the returned url / playground (see the workflow skill).

Confirm formats with uml://formats or list_diagram_types when unsure.

Changes

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.

  1. 14d ago First seen · 57 lines · 57 tokens per session scan A d2e2c8311877

Subscribe to this mod's changes

nomnoml is a skill published in the GitHub repository antoinebou12/uml-mcp (109 stars, last pushed yesterday), licensed MIT. It adds 57 tokens to every session and 566 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 2026-10-24.

mcpuml
Related

nomnoml compared with skills from other repositories

nomnoml next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
nomnomlantoinebou12/uml-mcpSkill109yesterdayMITA57Claude Code, Codex
detailed-designpan94u/forgeSkill405d agononeA27Claude Code
writing-skillstakaakit/superpowers-umlSkill121mo agononeA20Claude Code
brainstormingtakaakit/superpowers-umlSkill121mo agononeA37Claude Code
finishing-a-development-branchtakaakit/superpowers-umlSkill121mo agononeA27Claude Code
systematic-debuggingtakaakit/superpowers-umlSkill121mo agononeA21Claude Code
test-driven-developmenttakaakit/superpowers-umlSkill121mo agononeA17Claude Code