livecodes: Skill for Claude Code

.agents/skills/livecodes/language-support/SKILL.md

language-support is a skill for Claude Code, Codex from live-codes/livecodes. It costs 59 tokens per session (1,606 once invoked), scanned A, original, MIT.

Language configuration support for LiveCodes, an online code playground, covering more than 90 markup, styling, scripting, compiler, and WebAssembly-based languages.

In plain words
What is it for?
Use it to configure HTML, Markdown, CSS, Sass, TypeScript, React, and WebAssembly versions of languages such as Python, Ruby, or Go.
Why use it?
It makes it easier to configure the right language or processor for each editor instead of setting up language support manually.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: installed under .agents/ (shared by several agents).

This is live-codes/livecodes's own configuration. It tells Claude Code and Codex how to work on livecodes itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything livecodes configures →

About the project

live-codes/livecodes is a browser-based code playground for writing and running code in more than 90 languages, frameworks, and processors. It is used to experiment with code, import modules, embed interactive editors in websites, and host playgrounds on a static file server without a backend. The catalogue add-ons support working with LiveCodes.

live-codes/livecodes · 1,525 stars · on GitHub · livecodes.io

Reuse

Borrowing it

Nothing to install: this file belongs to live-codes/livecodes. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/live-codes/livecodes/develop/.agents/skills/livecodes/language-support/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/live-codes/livecodes

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 language-support

README.md
[![agentmods](https://agentmods.dev/badge/skills/live-codes/livecodes/language-support/github.svg)](https://agentmods.dev/skills/live-codes/livecodes/language-support)
Your own site
<a href="https://agentmods.dev/skills/live-codes/livecodes/language-support"><img src="https://agentmods.dev/badge/skills/live-codes/livecodes/language-support/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 language-support

Your own site · 80×15
<a href="https://agentmods.dev/skills/live-codes/livecodes/language-support"><img src="https://agentmods.dev/badge/skills/live-codes/livecodes/language-support.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 59 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,606 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. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
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 $0.00059 $0.01606
Opus 5.5 $0.00024 $0.00642
Sonnet 5.5 $0.00012 $0.00321
Haiku 4.5 $0.00006 $0.00161

Measured 1mo ago against content hash 49cad86f0b8a, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

language-support 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 1mo 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.

.agents/skills/livecodes/language-support/SKILL.md · 211 lines

How it starts

The opening of the file, as written. The whole thing — 211 lines — stays where its author put it; the contents beside it link to each section on GitHub.

LiveCodes — Work with Languages

LiveCodes supports 90+ languages across three editors: markup (HTML/templating), style (CSS/preprocessors), and script (JS/compiled languages).

Setup

import { createPlayground } from 'livecodes';

// Basic language setup
createPlayground('#container', {
  config: {
    markup: { language: 'markdown', content: '# Hello' },
    style: { language: 'scss', content: '$color: blue; body { color: $color; }' },
    script: { language: 'typescript', content: 'const x: number = 1;' },
  },
});

// WASM language (Python)
createPlayground('#container', {
  config: {
    script: { language: 'python-wasm', content: 'print("Hello from Python")' },
  },
});

// Framework template
createPlayground('#container', { template: 'react' });

Core Patterns

Set language for each editor

// Markup languages
markup: { language: 'html', content: '...' }        // HTML
markup: { language: 'markdown', content: '...' }    // Markdown
markup: { language: 'mdx', content: '...' }         // MDX
markup: { language: 'pug', content: '...' }         // Pug
markup: { language: 'handlebars', content: '...' }   // Handlebars

// Style languages
style: { language: 'css', content: '...' }          // CSS
style: { language: 'scss', content: '...' }         // SCSS/Sass
style: { language: 'less', content: '...' }        // Less
style: { language: 'stylus', content: '...' }       // Stylus

// Script languages
script: { language: 'javascript', content: '...' } // JavaScript
script: { language: 'typescript', content: '...' }  // TypeScript
script: { language: 'jsx', content: '...' }         // JSX
script: { language: 'tsx', content: '...' }         // TSX

Use CSS processors

const config = {
  style: { language: 'css', content: '...' },
  processors: [
    'tailwindcss', // Tailwind CSS
    'autoprefixer', // Add vendor prefixes
    'postcssPresetEnv', // Use future CSS
    'cssmodules', // CSS Modules
    'cssnano', // Minify
  ],
};

// Processors run in order listed
// Tailwind should come before PostCSS tools

Read the full file on GitHub · 211 lines

Files

What ships with it

1 file 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.

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. 1mo ago Changed · +1 lines · -3 tokens per session 49cad86f0b8a
  2. 2mo ago First seen · 210 lines · 62 tokens per session scan A ae2ae4a06941

Subscribe to this mod's changes

language-support is a skill published in the GitHub repository live-codes/livecodes (1,525 stars, last pushed 13d ago), licensed MIT. It adds 59 tokens to every session and 1,606 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 2026-08-30.

Related

language-support compared with skills from other repositories

language-support next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
language-supportlive-codes/livecodesSkill1.5k13d agoMITA59Claude Code, Codex
psl-ast-layersprisma/ormSkill48kyesterdayApache-2.0A78Claude Code, Codex
ast-visitor-patternprisma/ormSkill48kyesterdayApache-2.0A65Claude Code, Codex
no-bare-castsprisma/ormSkill48kyesterdayApache-2.0A52Claude Code, Codex
bumping-biomeprisma/ormSkill48kyesterdayApache-2.0A96Claude Code, Codex
migrate-oxfmtoxc-project/oxcSkill23ktodayMITA48Claude Code, Codex
ax-cpp-aiax-llm/axSkill3.0k3d agoApache-2.0A47Claude Code, Codex