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vegalite

vegalite is a skill for Claude Code, Codex from antoinebou12/uml-mcp. It costs 54 tokens per session (475 once invoked), scanned A, original, MIT.

A Vega-Lite diagram-writing guide for Vega-Lite, a shorter JSON language for describing data visualisations. It produces chart definitions from data fields, marks, and visual encodings.

In plain words
What is it for?
Use it to make charts such as bars or points by mapping data fields to positions and other visual properties. The result can be rendered as PNG, SVG, or PDF.
Why use it?
It helps create consistent chart specifications without manually coding every drawing detail. It also gives the validation and rendering workflow used by uml-mcp.

Skill for Claude CodeCodex

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

not rated 109repo +1 yesterday A scan 54 tokens original MIT

Good fit Use it to make charts such as bars or points by mapping data fields to positions and other visual properties. The result can be rendered as PNG, SVG, or PDF.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/antoinebou12/uml-mcp/vegalite
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 vegalite
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 vegalite

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

Your own site · 80×15
<a href="https://agentmods.dev/skills/antoinebou12/uml-mcp/vegalite"><img src="https://agentmods.dev/badge/skills/antoinebou12/uml-mcp/vegalite.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 54 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 475 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 $0.00054 $0.00475
Opus 5.5 $0.00022 $0.00190
Sonnet 5.5 $0.00011 $0.00095
Haiku 4.5 $0.00005 $0.00047

Measured 14d ago against content hash d8d1ed38b6ee, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

vegalite 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/vegalite/SKILL.md · 43 lines

What it actually says

vegalite diagram (uml-mcp)

diagram_type: vegalite
Backend: vegalite
Output formats: png, svg, pdf

Vega-Lite visualization grammar

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.

Styling

  • Use config + mark.color / encoding colors; set explicit width/height.
  • No MCP theme param.

Starter template

{"$schema":"https://vega.github.io/schema/vega-lite/v5.json","data":{"values":[{"a":1},{"a":2}]},"mark":"bar","encoding":{"x":{"field":"a","type":"quantitative"}}}

Example

{"$schema":"https://vega.github.io/schema/vega-lite/v5.json","data":{"values":[{"a":1,"b":2},{"a":2,"b":4}]},"mark":"point","encoding":{"x":{"field":"a","type":"quantitative"},"y":{"field":"b","type":"quantitative"}}}

Render with uml-mcp

  1. Set diagram_type to vegalite 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 · 43 lines · 54 tokens per session scan A d8d1ed38b6ee

Subscribe to this mod's changes

vegalite is a skill published in the GitHub repository antoinebou12/uml-mcp (109 stars, last pushed yesterday), licensed MIT. It adds 54 tokens to every session and 475 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.

Analytics and metricsmcpuml
Related

vegalite compared with skills from other repositories

vegalite next to 6 skills from other repositories
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vegaliteantoinebou12/uml-mcpSkill109yesterdayMITA54Claude Code, Codex
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writing-skillstakaakit/superpowers-umlSkill121mo agononeA20Claude Code
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finishing-a-development-branchtakaakit/superpowers-umlSkill121mo agononeA27Claude Code
systematic-debuggingtakaakit/superpowers-umlSkill121mo agononeA21Claude Code
test-driven-developmenttakaakit/superpowers-umlSkill121mo agononeA17Claude Code