Design Md Validator

What it does

When your agent uses it

• The user wants to lint a DESIGN.md
• Check spec compliance
• Find broken token references
• Verify WCAG contrast ratios

Example prompts

• “validate DESIGN.md”
• “lint DESIGN.md”
• “check my design.md”
• “/design-md-validator”

Requirements

• Node.js

Workflow steps

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

1. 1Obtain the DESIGN.md
2. 2Discover the Active Rule Set
3. 3Run Lint
4. 4Interpret Findings
5. 5Provide Actionable Fixes
6. 6Re-validate After Fixes

What it can do on your machine

Read from SKILL.md and the folder at commit f1de632. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Shell commands in SKILL.md call:

  • npx

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

• Network

  No URLs in SKILL.md. Its commands use npx, which can reach the network depending on how they are called.

  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

Design Md Validator loads about 1.7k tokens when it runs, and up to ~3.4k if it reads all its reference files. Until then it costs about 198 tokens; SKILL.md has 532 words of instructions outside code blocks.

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

~198

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

~1.7k

With references · SKILL.md plus every file in references/, read only if the agent opens them

~3.4k

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

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 fabricioctelles/skills at commit f1de632, republished under its Apache-2.0 licence (© fabricioctelles). 532 words, ~1,707 tokens.

name

design-md-validator

description

Validate DESIGN.md files against the official Google specification using the `@google/design.md` CLI linter. Works with local files. Use when the user wants to lint a DESIGN.md, check spec compliance, find broken token references, verify WCAG contrast ratios, diff two versions, export tokens to Tailwind or DTCG format, or audit a design system file for structural correctness. Trigger on mentions of "validate DESIGN.md", "lint DESIGN.md", "check my design.md", "design.md spec compliance", "WCAG contrast check", "broken token references", "design token validation", "export design tokens", "diff design systems", "design.md audit", "@google/design.md", "npx design.md lint", "design system validation", "frontmatter tokens", or any request to verify a DESIGN.md file.

metadata.author

https://ft.ia.br

metadata.version

1.3

metadata.date

2026-09-16

metadata.repository

https://github.com/fabricioctelles/skills

metadata.license

Apache 2.0

metadata.category

product-verification

npx @google/design.md lint DESIGN.md

npx @google/design.md diff DESIGN.md DESIGN-v2.md

# Tailwind v3 config
npx @google/design.md export --format json-tailwind DESIGN.md

# Tailwind v4 CSS theme
npx @google/design.md export --format css-tailwind DESIGN.md

# W3C Design Tokens (DTCG)
npx @google/design.md export --format dtcg DESIGN.md

# CSS custom properties (optional --prefix)
npx @google/design.md export --format css-vars DESIGN.md
npx @google/design.md export --format css-vars --prefix ds DESIGN.md

npx @google/design.md spec
npx @google/design.md spec --rules
npx @google/design.md spec --rules-only --format json

npx @google/design.md lint ./DESIGN.md

cat DESIGN.md | npx @google/design.md lint -

npx @google/design.md spec --rules-only --format json

npx @google/design.md lint --format json DESIGN.md

npx -p @google/design.md designmd lint DESIGN.md

npx skills add google-labs-code/stitch-skills

User: validate my DESIGN.md

Agent:
1. Reads the file
2. Runs: npx @google/design.md spec --rules-only --format json
3. Runs: npx @google/design.md lint --format json DESIGN.md
4. Parses output
5. Reports:
   - summary: { errors: 0, warnings: 2, infos: 1 }
   - WARNING: contrast-ratio — button textColor on backgroundColor is 3.8:1 (needs 4.5:1)
   - WARNING: orphaned-tokens — color "accent-muted" defined but never used
   - INFO: token-summary — 5 colors, 3 typography, 2 rounded, 2 spacing
6. Suggests fixes with code
7. Re-runs lint to confirm

© fabricioctelles, Apache-2.0. 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 2 other files (references) in skills/design-md-validator of fabricioctelles/skills.

• SKILL.md
• references/linting-rules.md
• references/token-schema.md

Open the folder on GitHubat commit f1de632