seo-rendering: Security & Code Review for AI Agents | OpenAgentSkill

Overview

Audit a page's rendering strategy and JavaScript dependency — diff raw HTML against the rendered DOM to measure how much primary content, links, headings, and JSON-LD exist only after JS executes, classify CSR-only / SSR / SSG / ISR, and emit framework-specific guidance. Module M4. Feeds both the Search SEO and AI Visibility scores.

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seo-rendering (M4)

Content that only exists after hydration is invisible to any consumer that does not run JavaScript. Google renders JS (documented); most third-party AI crawlers are reported not to (directional — see Honesty), so a CSR-only shell is primarily an AI-visibility and crawl-efficiency problem. JS dependency also delays first paint; see references/cwv-thresholds.md for how this feeds LCP/INP.

Inputs

Work from the PageSnapshot named in your dispatch envelope: read parsed from <run_dir>/pages/<slug>.json and parsed_rendered, plus the render{needed,signals,used,confidence,hint,delta} block — the script already computed the raw-vs-rendered delta; raw_html_path/rendered_html_path name the files on disk; Grep pages/<slug>.html for verbatim evidence; site artifacts live in <run_dir>/site/{robots.json,sitemaps.json,discovery.json}. Deterministic findings already emitted by audit.mjs are listed in <run_dir>/findings.deterministic.json — do not re-emit those ids; add model-judged findings only. If invoked directly with a URL/path and no snapshot exists, first run node "${CLAUDE_PLUGIN_ROOT}/scripts/snapshot.mjs" <target> --out "${CLAUDE_PLUGIN_DATA}/runs" and use the printed snapshot path.

Audits

Working from the PageSnapshot (parsed_rendered when render.used is not none, else parsed) and the script-computed render.delta:

Content delta: diff raw_html_path vs rendered_html_path — measure the share of primary text, internal links, headings (h1–h3), and <script type="application/ld+json"> blocks that appear only after JavaScript runs.
Classify the strategy: CSR-only (empty/near-empty raw shell, content injected client-side) / SSR / SSG (prerendered static) / ISR (prerendered + revalidated). Use raw-HTML completeness and framework signals (__NEXT_DATA__, hydration markers, data-reactroot, build manifests).
Hydration-blocked text: primary content present in raw HTML but hidden/empty until hydration, or rendered only into a client-only island.
Lazy-loaded main content: above-the-fold or primary content that requires scroll/intersection/interaction to load — invisible to a non-interacting crawler.
AI gate: if the h1, primary body, or JSON-LD exist only in rendered_html_path, flag the page as not reliably consumable by non-JS AI crawlers.

Fixes (fixable: advisory)

Rendering strategy is a framework/architecture decision with high breakage risk, so M4 is ADVISORY only — it diagnoses and prioritizes, it never auto-edits build/server code.

Emit framework-specific guidance: e.g. move CSR-only routes to SSG/ISR or SSR (Next.js App Router server components / generateStaticParams + revalidate; Nuxt/Astro/SvelteKit equivalents).
Recommend prerendering or partial prerendering for primary content; reserve client-only islands for genuinely interactive widgets.
Where the right strategy depends on data freshness or constraints the snapshot can't reveal, leave a clearly-marked TODO for the user — never fabricate a revalidate interval or assert a strategy choice. Every finding carries fixable: advisory.

Verification

render_diff: compute the content-delta ratio of raw_html_path vs rendered_html_path (primary text / links / headings / JSON-LD present in rendered but absent in raw). A high delta on primary content confirms the JS dependency.
Rendering an accurate rendered_html_path requires a headless-browser data tier. When that tier is unavailable, status is needs_api — never a false pass.

Findings

Emit findings per schema/finding.schema.json. Severity policy: 5 is reserved for catastrophic, eligibility-killing facts at site/template scope; 4 major · 3 moderate · 2 minor · 1 cosmetic · 0 informational — and only an established severity-5 fail in an active category can cap a score (references/scoring-model.md). Examples:

M4.render.csr_only_primary_content — the H1 and body text exist only in rendered_html_path; the raw HTML is an empty shell (fail, severity 5, axis both, fixable: advisory, confidence established). This is the module's only capping finding, and only at template/site scope.
M4.render.jsonld_js_injected — JSON-LD blocks appear only after hydration, so a non-JS consumer sees no structured data (warn, severity 3, axis ai, fixable: advisory, confidence established).
M4.render.lazy_main_content — primary content loads only on scroll or interaction (warn, severity 3, axis both, fixable: advisory, confidence directional).
M4.render.needs_renderer — the page shows CSR signals and no renderer was available, so the delta could not be measured (needs_api, severity 3, axis both). Each finding: evidence.observed quotes the raw-vs-rendered delta on the page; verification.reproduce is a runnable render_diff assertion; expected_impact is banded + confidence-tagged (no naked %).

Honesty

Googlebot renders JavaScript — documented by Google (second-wave, queued rendering), so a well-built CSR app can still be indexed and rank. That part is established; treat CSR-only as a risk to AI consumers and to crawl efficiency, not as an automatic Google failure.
"Most AI crawlers do not execute JavaScript" is directional, not documented. Vendors publish user-agent tokens, not rendering capabilities. Word it as "we could not confirm that these crawlers execute JS, and their published behaviour suggests they do not" — never as a vendor statement.
Don't claim "SSR ranks higher than CSR" as a ranking factor. What is real is content availability to non-JS consumers and faster first paint, not a rendering-mode boost. Keep CSR where the page is interactive by nature and the primary content is still server-delivered.
A render delta measured without a real headless browser is not a measurement — if the renderer tier was unavailable, say needs_api rather than inferring the delta from framework markers alone.

View source ↗

File metadata

name: seo-rendering
description: Audit a page's rendering strategy and JavaScript dependency — diff raw HTML against the rendered DOM to measure how much primary content, links, headings, and JSON-LD exist only after JS executes, classify CSR-only / SSR / SSG / ISR, and emit framework-specific guidance. Module M4. Feeds both the Search SEO and AI Visibility scores.
allowed-tools: Read, Grep, Glob, WebFetch, Bash

View original text

---
name: seo-rendering
description: Audit a page's rendering strategy and JavaScript dependency — diff raw HTML against the rendered DOM to measure how much primary content, links, headings, and JSON-LD exist only after JS executes, classify CSR-only / SSR / SSG / ISR, and emit framework-specific guidance. Module M4. Feeds both the Search SEO and AI Visibility scores.
allowed-tools: Read, Grep, Glob, WebFetch, Bash
---

# seo-rendering (M4)

Content that only exists after hydration is invisible to any consumer that does not run JavaScript. Google renders JS (documented); most third-party AI crawlers are **reported** not to (directional — see Honesty), so a CSR-only shell is primarily an AI-visibility and crawl-efficiency problem. JS dependency also delays first paint; see `references/cwv-thresholds.md` for how this feeds LCP/INP.

## Inputs
Work from the PageSnapshot named in your dispatch envelope: read `parsed` from `<run_dir>/pages/<slug>.json` and `parsed_rendered`, plus the `render{needed,signals,used,confidence,hint,delta}` block — the script already computed the raw-vs-rendered delta; `raw_html_path`/`rendered_html_path` name the files on disk; Grep `pages/<slug>.html` for verbatim evidence; site artifacts live in `<run_dir>/site/{robots.json,sitemaps.json,discovery.json}`. Deterministic findings already emitted by `audit.mjs` are listed in `<run_dir>/findings.deterministic.json` — do not re-emit those ids; add model-judged findings only. If invoked directly with a URL/path and no snapshot exists, first run `node "${CLAUDE_PLUGIN_ROOT}/scripts/snapshot.mjs" <target> --out "${CLAUDE_PLUGIN_DATA}/runs"` and use the printed snapshot path.

## Audits
Working from the PageSnapshot (`parsed_rendered` when `render.used` is not `none`, else `parsed`) and the script-computed `render.delta`:
1. **Content delta**: diff `raw_html_path` vs `rendered_html_path` — measure the share of primary text, internal links, headings (h1–h3), and `<script type="application/ld+json">` blocks that appear **only** after JavaScript runs.
2. **Classify the strategy**: CSR-only (empty/near-empty raw shell, content injected client-side) / SSR / SSG (prerendered static) / ISR (prerendered + revalidated). Use raw-HTML completeness and framework signals (`__NEXT_DATA__`, hydration markers, `data-reactroot`, build manifests).
3. **Hydration-blocked text**: primary content present in raw HTML but hidden/empty until hydration, or rendered only into a client-only island.
4. **Lazy-loaded main content**: above-the-fold or primary content that requires scroll/intersection/interaction to load — invisible to a non-interacting crawler.
5. **AI gate**: if the h1, primary body, or JSON-LD exist only in `rendered_html_path`, flag the page as not reliably consumable by non-JS AI crawlers.

## Fixes (fixable: advisory)
Rendering strategy is a framework/architecture decision with high breakage risk, so M4 is **ADVISORY only** — it diagnoses and prioritizes, it never auto-edits build/server code.
- Emit framework-specific guidance: e.g. move CSR-only routes to SSG/ISR or SSR (Next.js App Router server components / `generateStaticParams` + `revalidate`; Nuxt/Astro/SvelteKit equivalents).
- Recommend prerendering or partial prerendering for primary content; reserve client-only islands for genuinely interactive widgets.
- Where the right strategy depends on data freshness or constraints the snapshot can't reveal, leave a clearly-marked TODO for the user — **never** fabricate a `revalidate` interval or assert a strategy choice. Every finding carries `fixable: advisory`.

## Verification
- `render_diff`: compute the content-delta ratio of `raw_html_path` vs `rendered_html_path` (primary text / links / headings / JSON-LD present in rendered but absent in raw). A high delta on primary content confirms the JS dependency.
- Rendering an accurate `rendered_html_path` requires a headless-browser data tier. When that tier is unavailable, status is `needs_api` — never a false `pass`.

## Findings
Emit findings per `schema/finding.schema.json`. **Severity policy**: 5 is reserved for catastrophic, eligibility-killing facts at site/template scope; 4 major · 3 moderate · 2 minor · 1 cosmetic · 0 informational — and only an `established` severity-5 `fail` in an active category can cap a score (`references/scoring-model.md`). Examples:
- `M4.render.csr_only_primary_content` — the H1 and body text exist only in `rendered_html_path`; the raw HTML is an empty shell (`fail`, severity 5, axis `both`, `fixable: advisory`, confidence `established`). This is the module's only capping finding, and only at template/site scope.
- `M4.render.jsonld_js_injected` — JSON-LD blocks appear only after hydration, so a non-JS consumer sees no structured data (`warn`, severity **3**, axis `ai`, `fixable: advisory`, confidence `established`).
- `M4.render.lazy_main_content` — primary content loads only on scroll or interaction (`warn`, severity **3**, axis `both`, `fixable: advisory`, confidence `directional`).
- `M4.render.needs_renderer` — the page shows CSR signals and no renderer was available, so the delta could not be measured (`needs_api`, severity 3, axis `both`).
Each finding: `evidence.observed` quotes the raw-vs-rendered delta on the page; `verification.reproduce` is a runnable `render_diff` assertion; `expected_impact` is banded + confidence-tagged (no naked %).

## Honesty
- **Googlebot renders JavaScript** — documented by Google (second-wave, queued rendering), so a well-built CSR app can still be indexed and rank. That part is `established`; treat CSR-only as a risk to *AI consumers* and to crawl efficiency, not as an automatic Google failure.
- **"Most AI crawlers do not execute JavaScript" is `directional`, not documented.** Vendors publish user-agent tokens, not rendering capabilities. Word it as "we could not confirm that these crawlers execute JS, and their published behaviour suggests they do not" — never as a vendor statement.
- Don't claim "SSR ranks higher than CSR" as a ranking factor. What is real is content **availability** to non-JS consumers and faster first paint, not a rendering-mode boost. Keep CSR where the page is interactive by nature and the primary content is still server-delivered.
- A render delta measured without a real headless browser is not a measurement — if the renderer tier was unavailable, say `needs_api` rather than inferring the delta from framework markers alone.

Review the source

Skill source recorded

Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.

Review before install: Avoid automatic install

License: MIT

Dependency or permission surface needs review
Permission surface may require sandboxing
AI review approval is missing
Quality score needs review
Permission surface needs review: secrets or environment access, shell or command execution
GitHub adoption: 59 GitHub stars
Stars/forks activity: 59 stars, 5 forks; issue activity unavailable in current metadata
Dependency/runtime risk: command execution surface, credential or environment access
Permission surface: secrets or environment access, shell or command execution
Review status: AI review approval is missing

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Source & usage notes

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Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.

Source repository: Hainrixz/claude-seo-ai
License: MIT
Version: Unknown
Last GitHub push: Sep 7, 2026
Registry updated: Sep 12, 2026
Instruction path: skills/seo-rendering/SKILL.md @ cabd6079dc1a

Version reported in registry metadata; check source releases before relying on it.

Quality

59/100

Promising

Trust

61/100

Agent access

This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.

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More details

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    }
  },
  "endpoints": {
    "web": "https://www.openagentskill.com/skills/hainrixz-seo-rendering",
    "api": "https://www.openagentskill.com/api/agent/skills/hainrixz-seo-rendering",
    "audit": "https://www.openagentskill.com/skills/hainrixz-seo-rendering/audit",
    "eval": "https://www.openagentskill.com/api/agent/evals?slug=hainrixz-seo-rendering&task=Use%20seo-rendering%20in%20an%20agent%20workflow&max_risk=medium",
    "resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20seo-rendering%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
    "receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20seo-rendering%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
    "install": "https://www.openagentskill.com/api/skills/hainrixz-seo-rendering/install",
    "manifest": "https://www.openagentskill.com/api/registry/manifest/hainrixz-seo-rendering"
  }
}

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Creator: Hainrixz
Source: Hainrixz/claude-seo-ai
Indexed by: OpenAgentSkill community index

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[![Listed on OpenAgentSkill](https://www.openagentskill.com/api/badge/hainrixz-seo-rendering?metric=listed&label=Listed)](https://www.openagentskill.com/skills/hainrixz-seo-rendering?ref=github&utm_source=github&utm_medium=referral&utm_campaign=creator_badge)
[![OpenAgentSkill Trust](https://www.openagentskill.com/api/badge/hainrixz-seo-rendering?metric=trust&label=Trust)](https://www.openagentskill.com/skills/hainrixz-seo-rendering?ref=github&utm_source=github&utm_medium=referral&utm_campaign=creator_badge)
[![OpenAgentSkill Audit](https://www.openagentskill.com/api/badge/hainrixz-seo-rendering?metric=audit&label=Audit)](https://www.openagentskill.com/skills/hainrixz-seo-rendering/audit)
[![Agent Proven](https://www.openagentskill.com/api/badge/hainrixz-seo-rendering?metric=proven&label=Agent%20Proven)](https://www.openagentskill.com/skills/hainrixz-seo-rendering?ref=github&utm_source=github&utm_medium=referral&utm_campaign=creator_badge)

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