# Diagnostics

> Use for structured technical SEO audits, incident response, and validation.

- Skill: `majiayu000/diagnostics` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds add majiayu000/diagnostics`
- Raw SKILL.md: https://api.skillmd.com/api/skills/majiayu000/diagnostics/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Marketing & Growth
- Author: majiayu000 (https://skillmd.com/u/majiayu000)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/majiayu000/diagnostics

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# Technical Diagnostics Toolkit Skill

## When to Use
- Investigating crawl/index anomalies, traffic drops, or Core Web Vitals regressions.
- Running scheduled audits ahead of major launches or migrations.
- Validating fixes before/after engineering deployments.

## Framework
1. **Signal Triangulation** – combine Search Console, log files, crawler output, and analytics deltas.
2. **Replication Scripts** – document steps to reproduce issues (user agents, locales, device types).
3. **Root Cause Hypotheses** – map symptoms to likely causes (render blocking, redirects, robots, schema errors).
4. **Fix Design** – outline remediation options, risk level, dependencies, and testing approach.
5. **Validation & Monitoring** – specify metrics and alerts to confirm resolution.

## Templates
- Diagnostics worksheet (symptom, evidence, hypothesis, owner, next action).
- Crawl + render checklist per environment.
- Validation log capturing metrics pre/post change.

## Tips
- Keep historical baselines to quickly detect regressions.
- Pair with engineering release notes to correlate incidents.
- Automate recurring crawls and lighthouse runs to catch issues early.

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