Mdx Sanitizer

What it does

When your agent uses it

• Pre-commit hooks fail on bracket
• Liquid validation
• MDX/JSX build errors reference unexpected tokens

Example prompts

• “/mdx-sanitizer”

Requirements

• Pre-approved tools (allowed-tools): Read, Write, Edit, Bash, Glob, Grep

Workflow steps

3 steps, taken from the step headings in SKILL.md.

1. 1Sync-Time Sanitization (Proactive)
2. 2Pre-Commit Validation (Reactive)
3. 3Build-Time Validation (Final Check)

What it can do on your machine

Read from SKILL.md and the folder at commit 6713fc7. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves these tools, so the agent can use them without asking each time:

  • Read
  • Write
  • Edit
  • Bash
  • Glob
  • Grep

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Shell commands in SKILL.md call:

  • npm

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  Links to these hosts (documentation or services it may open):

  • mdxjs.com
  • github.com

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Mdx Sanitizer loads about 1.2k tokens when it runs. Until then it costs about 100 tokens; SKILL.md has 305 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~100

When it runs · the whole SKILL.md, loaded when a task matches

~1.2k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

• NotePre-approves every shell command (allowed-tools: Bash)SKILL.md

  allowed-tools: Read, Write, Edit, Bash, Glob, Grep

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from curiositech/some_claude_skills at commit 6713fc7, republished under its MIT licence (© curiositech). 305 words, ~1,202 tokens.

name

mdx-sanitizer

description

Sanitize MDX content for Docusaurus builds. Fixes unescaped angle brackets (<, >, &lt;=, &gt;=), Liquid/Nunjucks template syntax ({{ }}), TypeScript generics (Promise&lt;T&gt;), and inline code backtick edge cases. Use when pre-commit hooks fail on bracket or Liquid validation, or when MDX/JSX build errors reference unexpected tokens. NOT for general markdown linting or prose editing.

allowed-tools

Read, Write, Edit, Bash, Glob, Grep

version

1.0.0

triggers

mdx error, angle bracket, jsx parsing, build failure mdx, escape angle brackets, sanitize markdown

metadata.category

DevOps & Automation

metadata.tags

mdx, docusaurus, markdown, build-tools, sanitization

cd website
npm run sanitize:mdx
# or with verbose output
npm run sanitize:mdx -- --verbose

cd website
npm run sanitize:mdx -- --fix
# or shorthand
npm run fix:mdx

import { sanitizeForMdx, validateMdxSafety, isMdxSafe } from './lib/mdx-sanitizer';

// Sanitize content
const result = sanitizeForMdx(content, { useHtmlEntities: true });
if (result.modified) {
  console.log(`Fixed ${result.issues.length} issues`);
  fs.writeFileSync(path, result.content);
}

// Validate without modifying
const issues = validateMdxSafety(content, 'path/to/file.md');

// Quick check
if (!isMdxSafe(content)) {
  // Handle issues
}

© curiositech, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 1 other file in .claude/skills/mdx-sanitizer of curiositech/some_claude_skills.

• SKILL.md
• .claude-plugin/plugin.json

Open the folder on GitHubat commit 6713fc7