--- name: validate description: | Use when a web project needs W3C HTML/CSS validity check or WCAG 2.1 accessibility audit. Dispatches the validator-analyzer agent with a STRICT scope filter (no meta/OG/JSON-LD/CWV/security-header noise). Triggers: "validate", "validation", "w3c", "html validity", "css validity", "wcag", "accessibility", "a11y audit", "axe", "pa11y", "wave", "validator.w3.org", "nu validator", "accessibilité", "audit a11y", "audit wcag", "normes w3c", "conformité web". For CSP/HSTS/404 → /harden. For meta/sitemap → /seo. For AI engines → /geo. argument-hint: [URL] [--fix] [--local|--full] [--no-external] allowed-tools: - Read - Edit - Write - Bash - Grep - Glob - Agent - WebFetch --- # /validate — web standards audit (W3C + WCAG) This skill orchestrates a narrow-scope standards audit : - **W3C HTML validity** — validator.nu API (FULL) or `html-validate` / `vnu.jar` (LOCAL) or static fallback. - **W3C CSS validity** — jigsaw.w3.org/css-validator API (FULL) or `stylelint` / `css-tree` (LOCAL) or static fallback. - **WCAG 2.1 accessibility** — `pa11y` / `@axe-core/cli` / WAVE API (FULL) or axe against built HTML (LOCAL) or static checklist. Scope boundary : - **In** : HTML syntactic validity (DOCTYPE, required attrs, tag nesting, ID uniqueness, heading hierarchy), CSS syntactic validity (parsing errors, unknown properties, at-rule misuse), WCAG 2.1 A / AA / AAA violations (ARIA, landmarks, contrast, keyboard, SR affordances, alt text). - **Out** : meta tags (title/description/OG), JSON-LD / Schema.org, sitemap.xml, robots.txt, llms.txt, security headers (HSTS/CSP), cookie flags, Core Web Vitals, image compression, hreflang, i18n routing, generic code linting (ESLint, Prettier), TypeScript type errors. If a finding appears in an out-of-scope area (e.g. missing meta description), the agent drops it silently — `/validate` stays focused. ### Relation to other skills - `/onboard` runs an initial a11y audit at project setup (axe or static checklist → `.onboard-audit/a11y.md`). `/validate` is the **on-demand** equivalent, re-runnable anytime against the current codebase, and also covers HTML/CSS validity (which `/onboard` does not). - `/harden` audits security posture (headers, TLS, redirects). `/validate` audits conformance. They share no findings. - `/seo` and `/geo` audit indexability. They may flag the same HTML features (alt attrs, heading structure) but from a ranking perspective. `/validate` flags from a **standards** perspective (WCAG SC number, W3C rule id). Findings may overlap — both reports are still valid. --- ## STEP 0 — Collect context ### Parse arguments - If `$ARGUMENTS` contains `https?://` → `TARGET_URL`. - Extract `DOMAIN` from `TARGET_URL` : `DOMAIN=${TARGET_URL#http*://}; DOMAIN=${DOMAIN%%/*}`. - If `$ARGUMENTS` contains `--fix` → `MODE=fix`. Else `MODE=audit`. - If `--local` → `DEPTH=LOCAL`. If `--full` → `DEPTH=FULL`. - If URL present and no depth flag → default `DEPTH=FULL`. - If no URL and no depth flag → default `DEPTH=LOCAL`. - If `--no-external` → `EXTERNAL=off`. Else `on`. - `EXTERNAL` auto-off in LOCAL mode (no URL to scan remotely). ### Detect HTML / CSS files ```bash HTML_COUNT=$(find . -name "*.html" \ -not -path "*/node_modules/*" \ -not -path "*/dist/*" \ -not -path "*/.next/*" \ -not -path "*/.validate-cache/*" 2>/dev/null | wc -l) CSS_COUNT=$(find . -name "*.css" \ -not -path "*/node_modules/*" \ -not -path "*/dist/*" \ -not -path "*/.next/*" 2>/dev/null | wc -l) ``` If both counts are 0 and no URL provided → abort with : ``` ⚠️ No HTML or CSS files found and no URL provided. /validate needs either local files or a live URL. Re-run with --full . ``` ### Detect framework ```bash FRAMEWORK="static" [ -f astro.config.mjs ] || [ -f astro.config.ts ] && FRAMEWORK="astro" [ -f next.config.js ] || [ -f next.config.mjs ] || [ -f next.config.ts ] && FRAMEWORK="next" [ -f vite.config.js ] || [ -f vite.config.ts ] && FRAMEWORK="vite" [ -f svelte.config.js ] && FRAMEWORK="svelte" [ -f nuxt.config.js ] || [ -f nuxt.config.ts ] && FRAMEWORK="nuxt" [ -f vue.config.js ] && FRAMEWORK="vue" ``` For JS frameworks, HTML validity must target built output. Check for build dir : ```bash BUILD_DIR="" for d in dist _site build out public; do [ -d "$d" ] && BUILD_DIR="$d" && break done ``` If framework is JS-based and `BUILD_DIR` is empty, warn : ``` ⚠️ Framework detected : . No build output found. HTML validity on JSX/TSX source is not meaningful. Options : 1. Run `npm run build` then re-run /validate 2. Use --full to audit production 3. Continue with partial LOCAL audit (CSS + static WCAG only) ``` ### Detect LOCAL tooling ```bash HAS_HTML_VALIDATE=$(npx --no-install html-validate --version >/dev/null 2>&1 && echo yes || echo no) HAS_STYLELINT=$(npx --no-install stylelint --version >/dev/null 2>&1 && echo yes || echo no) HAS_AXE=$(npx --no-install @axe-core/cli --version >/dev/null 2>&1 && echo yes || echo no) HAS_PA11Y=$(npx --no-install pa11y --version >/dev/null 2>&1 && echo yes || echo no) HAS_VNU=$([ -f /usr/share/vnu/vnu.jar ] || [ -f /opt/vnu/vnu.jar ] && echo yes || echo no) ``` Missing tools are NOT blockers — agent falls back to remote APIs (FULL) or static checks. ### Display collected context ``` VALIDATE — context URL : Domain : Depth : LOCAL | FULL Mode : audit | fix External : on | off (auto-off in LOCAL) HTML files : CSS files : Framework : Build dir : Local tools : html-validate=, stylelint=, axe=, pa11y=, vnu= ``` If MODE=fix, warn : ``` ⚠️ Fixes proposés comme diffs. Appliqués seulement après confirmation. ``` --- ## STEP 1 — Dispatch validator-analyzer Spawn a single `validator-analyzer` subagent with explicit scope and collected context : ``` Agent( subagent_type="validator-analyzer", description="validate — W3C HTML + CSS + WCAG audit", prompt=""" Dispatched from /validate. STRICT SCOPE — W3C HTML validity + W3C CSS validity + WCAG 2.1 accessibility ONLY. CONTEXT: TARGET_URL : DOMAIN : DEPTH : MODE : EXTERNAL : HTML_FILES : CSS_FILES : FRAMEWORK : BUILD_DIR : LOCAL_TOOLS : html-validate=, stylelint=, axe=, pa11y=, vnu= Execute your spec at $HOME/.claude/agents/validator-analyzer.md starting at STEP 1 (skip STEP 0 — context is above). OUT OF SCOPE — DROP silently if encountered : - meta tags (title/description/OG/Twitter/canonical) - JSON-LD / Schema.org / microdata - sitemap.xml, robots.txt, llms.txt - AI crawler directives - security headers (HSTS/CSP/X-Frame-Options/cookie flags) - Core Web Vitals, perf budgets - hreflang, i18n routing - image compression, video formats - generic code linting (ESLint, Prettier, TS errors) Mode behavior : - MODE=audit : NO file modifications. Report-only. Propose fixes as diffs in the report (```diff blocks), do NOT apply. - MODE=fix : Report issues, then produce Fix bundle (§5) with concrete diffs for auto-fixable items. STOP and emit "READY TO APPLY — awaiting dispatcher confirmation" at the end of §5. Do NOT apply any Edit/Write — the dispatcher handles STEP 3. Output: write /.claude/audits/VALIDATE.md (run `mkdir -p .claude/audits` first) per the structure in your spec (sections 0-8, score XX/100). """ ) ``` --- ## STEP 2 — Verify output ```bash test -s .claude/audits/VALIDATE.md && wc -l .claude/audits/VALIDATE.md || echo "MISSING .claude/audits/VALIDATE.md" ``` If missing or empty : ``` ⚠️ validator-analyzer did not produce .claude/audits/VALIDATE.md. Options : A) Retry with same scope B) Downgrade to LOCAL and retry (if FULL failed on network) C) Abort ``` Extract the score and critical-alert count from `.claude/audits/VALIDATE.md` for the console summary : ```bash grep -oE '\*\*Score\*\*\s+:\s+[0-9]+ / 100' .claude/audits/VALIDATE.md | head -1 grep -c '^### \[Critique\]' .claude/audits/VALIDATE.md ``` --- ## STEP 3 — Apply fixes (MODE=fix only) Skip this step if `MODE=audit`. If `.claude/audits/VALIDATE.md` ends with `READY TO APPLY — awaiting dispatcher confirmation` : 1. Parse the `## 5. Fix bundle` section. 2. Group by file. For each group, show the combined diff to the user. 3. Ask : ``` VALIDATE — fix bundle ready Files to modify (N) : - src/Layout.astro (3 fixes : lang attr, alt="", heading renumber) - src/styles/main.css (1 fix : invalid property removed) - src/pages/contact.html (2 fixes : unclosed tag, duplicate id) Critical : X | Haute : Y | Moyenne : Z | Basse : W Options : A) Apply all B) Review each diff before applying C) Apply only Critique + Haute D) Abort — keep .claude/audits/VALIDATE.md as audit report ``` 4. On `A` : apply each bundle via `Edit` (targeted `old_string` / `new_string`). Never use `Write` on shared templates (risk of overwriting /seo or /geo content — meta tags, JSON-LD). 5. On `B` : for each diff, show and ask yes/no/skip. 6. On `C` : filter to Critique + Haute, then behave as `A`. 7. On `D` : stop, leave `.claude/audits/VALIDATE.md` untouched. After applying, append a `## 8. Changes applied` section with commit-ready summary lines : ```markdown ## 8. Changes applied Date : Files modified : Fixes applied : ### src/Layout.astro - [Haute][HTML] Added `lang="en"` to `` (WCAG 3.1.1, W3C required attr) - [Haute][WCAG AA] Added `alt=""` to decorative icon at line 42 - [Moyenne][HTML] Renumbered h3 → h2 (heading hierarchy, line 67) ### src/styles/main.css - [Moyenne][CSS] Removed invalid property `bakground` → `background` at line 23 Verification : - Re-run /validate → expected score bump → - Tests to run : a11y regression (pa11y-ci), visual snapshot ``` Never apply fixes without explicit confirmation. Never use `--no-verify` on git hooks. --- ## STEP 4 — Console summary ``` VALIDATE AUDIT COMPLETE URL : Depth : LOCAL | FULL Mode : audit | fix Score : XX / 100 ( → if fix applied) Report : .claude/audits/VALIDATE.md BREAKDOWN : W3C HTML : W3C CSS : WCAG 2.1 : / / violations, TOP 3 ACTIONS (by severity × user impact) : 1. [Critique] — <file:line> 2. [Haute] <title> 3. [Haute] <title> NEXT STEPS : • /validate <url> --fix → apply recommended fixes • /validate <url> --full → re-run with live URL + remote APIs • /validate --no-external → skip third-party APIs (faster, LOCAL-like) • /harden / /seo / /geo → complementary audits (other scopes) Install for better LOCAL coverage : npm i -D html-validate stylelint @axe-core/cli pa11y ``` --- ## Rules - **Scope is non-negotiable.** If you find yourself reporting meta tags, sitemap, CSP, or JSON-LD, you drifted. Drop it. `/harden`, `/seo`, `/geo` own those respectively. - **Single agent dispatch.** Only `validator-analyzer`. No parallel fan-out. - **Never apply fixes without user confirmation**, even in `--fix`. The fix mode prepares the bundle; the dispatcher confirms (A/B/C/D). - **LOCAL vs FULL is about data sources**, not scope. Both cover the same 3 axes. LOCAL may be degraded if local tools missing (agent falls back to static checks — flagged "STATIC MODE" in report). - **Framework awareness.** For SPA/JS frameworks, validate built output (`dist/`, `_site/`, `build/`, `out/`), not JSX/TSX source. Warn if no build dir present. - **Respect CLAUDE.md architecture rules.** Public websites must ship WCAG 2.1 AA per France RGAA 4.1 when in scope. Flag AA violations as Haute, A violations as Critique. - **External validators are authoritative on live URLs.** validator.nu and jigsaw are the W3C backends. If a local tool disagrees with them, trust the W3C backend; flag the divergence as a finding. - **One report file.** `.claude/audits/VALIDATE.md`. On re-run, move previous content to a `## Historique` section, do not overwrite silently. - **Cache dir.** `.validate-cache/` (gitignored) stores raw tool outputs for debugging. Do not commit. - **Conservative auto-fix.** Only structural/syntactic fixes with no ambiguity. Content decisions (alt text, labels, contrast choices) always go to §6 User actions — never auto-applied.