seo-core-web-vitals: Security & Code Review for AI Agents | OpenAgentSkill

Overview

Audit Core Web Vitals & page performance — measure LCP, INP, and CLS against p75 field thresholds, diagnose render-blocking resources, unoptimized images, and layout-shift sources, and produce prioritized, advisory-only remediation guidance. Module M15. Feeds the Search SEO score (heavily) and the AI Visibility score (minimally).

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seo-core-web-vitals (M15)

Core Web Vitals are a confirmed Google ranking signal and a proxy for page quality. Thresholds, field-vs-lab honesty rules, and LCP decomposition: references/cwv-thresholds.md (follow it exactly).

Inputs

Work from the PageSnapshot named in your dispatch envelope: read parsed from <run_dir>/pages/<slug>.json (scripts[], stylesheets[], images[]) plus timing.ttfb_ms, body.bytes, and render — field data still needs the PSI tier; 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):

Field CWV at p75 — LCP ≤ 2.5 s, INP ≤ 200 ms (INP replaced FID), CLS ≤ 0.1, all at the 75th percentile of real-user data. All three must pass for a "good" rating. Use the proactive-warning thresholds (LCP > 2.0 s, INP > 160 ms, CLS > 0.08) to warn before failing.
Render-blocking resources — synchronous <script> in <head> (no defer/async/type=module), blocking <link rel="stylesheet">, and @import chains that delay first render (LCP/INP risk).
Unoptimized images — missing width/height (or aspect-ratio), no loading="lazy" below the fold, no responsive srcset/sizes, legacy formats where AVIF/WebP would serve, and a non-preloaded LCP image.
Layout-shift sources — images/iframes/ads/embeds without reserved dimensions, web-font swap without font-display/size-adjust, and content injected above existing content (CLS risk).
LCP decomposition — attribute LCP to TTFB vs resource load delay vs load duration vs render delay (see references/cwv-thresholds.md) so each finding targets the dominant subpart.

Fixes (fixable: advisory)

Advisory only. Performance fixes touch build config, server, CDN, and runtime JavaScript — high breakage risk — so the tool diagnoses and prioritizes but never auto-edits performance code. For each failing metric, name the specific resource/element causing it and rank fixes by expected leverage (e.g. preload the LCP image, defer non-critical JS, reserve image dimensions). Give framework-specific direction where the stack is known. Never fabricate measured values — if field data is absent, ask the user to supply a PSI/CrUX key or leave a clearly-marked TODO placeholder rather than guessing a metric.

Verification

Field (Tier 1): node "${CLAUDE_PLUGIN_ROOT}/scripts/psi-client.mjs" --url <final_url> [--strategy mobile|desktop] [--timeout 60000] calls the PageSpeed Insights API (loadingExperience, method psi_api). It takes a URL only — there is no --snapshot mode, because field data is measured on the live origin, not on a saved DOM. The key comes from the environment (CLAUDE_PLUGIN_OPTION_PSI_API_KEY, else PSI_API_KEY); there is deliberately no --key flag. Without a key the script returns status: "needs_api" at exit 0 — branch on status, never on the exit code. When PSI sets origin_fallback, the numbers are origin-level and the finding must say so. CrUX History (crux_api) is not implemented by the bundled client (references/cwv-thresholds.md): never claim a p75 trend from this tool.
Tier 0 (no key): emit status: needs_api for every field-CWV finding, plus clearly-labeled lab heuristics (render-blocking count, missing image dimensions, bundle weight). Label lab signals "lab data — not what Google ranks on"; never present a heuristic as a measured field value.
When the required data 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). Field CWV never reaches 5: it is a tie-breaker, not an eligibility gate. Examples:

M15.lcp.exceeds_p75 — field LCP > 2.5 s at p75 (status fail, severity 4, fixable: advisory, axis search, confidence established). evidence.observed quotes the measured p75 value and the LCP element; verification.reproduce runs the psi-client command.
M15.cls.unsized_image — image with no width/height shifting layout (status warn, severity 4, fixable: advisory, axis search, confidence directional). evidence.observed quotes the <img> tag.
M15.field.needs_api — no PSI/CrUX key, field CWV unverifiable (status needs_api, severity 4, fixable: advisory, axis search, confidence established). Each finding: evidence.observed quotes the page/measurement; verification.reproduce is the runnable command; expected_impact is banded + confidence-tagged (no naked %).

Honesty

Lab ≠ field. A single local Lighthouse run is diagnostic only; Google ranks on field (CrUX) p75. Never let a lab number drive the Search score or masquerade as a field result.
CWV is a real but modest tie-breaker signal — it does not override relevance/content quality. Don't promise ranking jumps from a green score; report it as banded expected_impact, not a predicted percentage gain.
A "100" lab performance score is not a pass if field p75 fails; only field data settles a CWV finding.

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File metadata

name: seo-core-web-vitals
description: Audit Core Web Vitals & page performance — measure LCP, INP, and CLS against p75 field thresholds, diagnose render-blocking resources, unoptimized images, and layout-shift sources, and produce prioritized, advisory-only remediation guidance. Module M15. Feeds the Search SEO score (heavily) and the AI Visibility score (minimally).
allowed-tools: Read, Grep, Glob, WebFetch, Bash

View original text

---
name: seo-core-web-vitals
description: Audit Core Web Vitals & page performance — measure LCP, INP, and CLS against p75 field thresholds, diagnose render-blocking resources, unoptimized images, and layout-shift sources, and produce prioritized, advisory-only remediation guidance. Module M15. Feeds the Search SEO score (heavily) and the AI Visibility score (minimally).
allowed-tools: Read, Grep, Glob, WebFetch, Bash
---

# seo-core-web-vitals (M15)

Core Web Vitals are a confirmed Google ranking signal and a proxy for page quality. Thresholds, field-vs-lab honesty rules, and LCP decomposition: `references/cwv-thresholds.md` (follow it exactly).

## Inputs
Work from the PageSnapshot named in your dispatch envelope: read `parsed` from `<run_dir>/pages/<slug>.json` (`scripts[]`, `stylesheets[]`, `images[]`) plus `timing.ttfb_ms`, `body.bytes`, and `render` — field data still needs the PSI tier; 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`):
1. **Field CWV at p75** — LCP ≤ 2.5 s, INP ≤ 200 ms (INP replaced FID), CLS ≤ 0.1, all at the 75th percentile of real-user data. All three must pass for a "good" rating. Use the proactive-warning thresholds (LCP > 2.0 s, INP > 160 ms, CLS > 0.08) to `warn` before failing.
2. **Render-blocking resources** — synchronous `<script>` in `<head>` (no `defer`/`async`/`type=module`), blocking `<link rel="stylesheet">`, and `@import` chains that delay first render (LCP/INP risk).
3. **Unoptimized images** — missing `width`/`height` (or `aspect-ratio`), no `loading="lazy"` below the fold, no responsive `srcset`/`sizes`, legacy formats where AVIF/WebP would serve, and a non-preloaded LCP image.
4. **Layout-shift sources** — images/iframes/ads/embeds without reserved dimensions, web-font swap without `font-display`/size-adjust, and content injected above existing content (CLS risk).
5. **LCP decomposition** — attribute LCP to TTFB vs resource load delay vs load duration vs render delay (see `references/cwv-thresholds.md`) so each finding targets the dominant subpart.

## Fixes (fixable: advisory)
**Advisory only.** Performance fixes touch build config, server, CDN, and runtime JavaScript — high breakage risk — so the tool **diagnoses and prioritizes** but never auto-edits performance code. For each failing metric, name the specific resource/element causing it and rank fixes by expected leverage (e.g. preload the LCP image, defer non-critical JS, reserve image dimensions). Give framework-specific direction where the stack is known. **Never fabricate measured values** — if field data is absent, ask the user to supply a PSI/CrUX key or leave a clearly-marked TODO placeholder rather than guessing a metric.

## Verification
- Field (Tier 1): `node "${CLAUDE_PLUGIN_ROOT}/scripts/psi-client.mjs" --url <final_url> [--strategy mobile|desktop] [--timeout 60000]` calls the PageSpeed Insights API (`loadingExperience`, method `psi_api`). It takes a **URL only** — there is no `--snapshot` mode, because field data is measured on the live origin, not on a saved DOM. The key comes from the environment (`CLAUDE_PLUGIN_OPTION_PSI_API_KEY`, else `PSI_API_KEY`); there is deliberately no `--key` flag. Without a key the script returns `status: "needs_api"` at exit 0 — branch on `status`, never on the exit code. When PSI sets `origin_fallback`, the numbers are origin-level and the finding must say so. **CrUX History (`crux_api`) is not implemented** by the bundled client (`references/cwv-thresholds.md`): never claim a p75 trend from this tool.
- Tier 0 (no key): emit `status: needs_api` for every field-CWV finding, plus clearly-labeled **lab heuristics** (render-blocking count, missing image dimensions, bundle weight). Label lab signals "lab data — not what Google ranks on"; never present a heuristic as a measured field value.
- When the required data 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`). Field CWV never reaches 5: it is a tie-breaker, not an eligibility gate. Examples:
- `M15.lcp.exceeds_p75` — field LCP > 2.5 s at p75 (status `fail`, severity 4, `fixable: advisory`, axis `search`, confidence `established`). `evidence.observed` quotes the measured p75 value and the LCP element; `verification.reproduce` runs the psi-client command.
- `M15.cls.unsized_image` — image with no `width`/`height` shifting layout (status `warn`, severity 4, `fixable: advisory`, axis `search`, confidence `directional`). `evidence.observed` quotes the `<img>` tag.
- `M15.field.needs_api` — no PSI/CrUX key, field CWV unverifiable (status `needs_api`, severity 4, `fixable: advisory`, axis `search`, confidence `established`).
Each finding: `evidence.observed` quotes the page/measurement; `verification.reproduce` is the runnable command; `expected_impact` is banded + confidence-tagged (no naked %).

## Honesty
- **Lab ≠ field.** A single local Lighthouse run is diagnostic only; Google ranks on field (CrUX) p75. Never let a lab number drive the Search score or masquerade as a field result.
- CWV is a real but **modest tie-breaker** signal — it does not override relevance/content quality. Don't promise ranking jumps from a green score; report it as banded `expected_impact`, not a predicted percentage gain.
- A "100" lab performance score is not a pass if field p75 fails; only field data settles a CWV finding.

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

Permission surface may require sandboxing
Potential broker, wallet, exchange, or real-money execution surface; sandbox and explicit approval are required
AI review approval is missing
This skill may touch real-money trading, broker, wallet, or exchange operations; use only in a sandbox with explicit approval.
Quality score needs review
Permission surface needs review: shell or command execution, network or browser access
GitHub adoption: 59 GitHub stars
Stars/forks activity: 59 stars, 5 forks; issue activity unavailable in current metadata
Permission surface: shell or command execution, network or browser access
Review status: AI review approval is missing

Open full audit

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2Ask your agent for a plan. Approve setup and any costs before running a small isolated test.

Source & usage notes

IndexedStatic Checked

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-core-web-vitals/SKILL.md @ cabd6079dc1a

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

Quality

59/100

Promising

Trust

64/100

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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    ],
    "expected_agent_output": {
      "selected_skill": "hainrixz-seo-core-web-vitals (seo-core-web-vitals)",
      "install_command": "npx skills add Hainrixz/claude-seo-ai --skill seo-core-web-vitals",
      "risk_summary": "Risky; Blocked for auto-install; Review before production",
      "verification_result": "Report the smallest successful task, files touched, warnings, and any missing setup."
    }
  },
  "outcome_feedback": {
    "endpoint": "https://www.openagentskill.com/api/agent/outcome",
    "method": "POST",
    "requires_resolve_event_id": true,
    "event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
    "expected_outcomes": [
      "success",
      "failed",
      "not_relevant",
      "blocked_by_risk",
      "setup_required"
    ],
    "payload_template": {
      "event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
      "skill_slug": "hainrixz-seo-core-web-vitals",
      "task": "Use seo-core-web-vitals in an agent workflow",
      "agent": "codex",
      "outcome": "success",
      "install_used": true,
      "risk_blocked": false,
      "setup_required": false,
      "task_success": true,
      "output_quality": 4,
      "error_type": null,
      "human_review_required": false,
      "workspace": "sandbox",
      "time_to_useful_ms": 120000,
      "notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
    }
  },
  "endpoints": {
    "web": "https://www.openagentskill.com/skills/hainrixz-seo-core-web-vitals",
    "api": "https://www.openagentskill.com/api/agent/skills/hainrixz-seo-core-web-vitals",
    "audit": "https://www.openagentskill.com/skills/hainrixz-seo-core-web-vitals/audit",
    "eval": "https://www.openagentskill.com/api/agent/evals?slug=hainrixz-seo-core-web-vitals&task=Use%20seo-core-web-vitals%20in%20an%20agent%20workflow&max_risk=medium",
    "resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20seo-core-web-vitals%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
    "receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20seo-core-web-vitals%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
    "install": "https://www.openagentskill.com/api/skills/hainrixz-seo-core-web-vitals/install",
    "manifest": "https://www.openagentskill.com/api/registry/manifest/hainrixz-seo-core-web-vitals"
  }
}

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

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