name: schema-markup
description: >
Design, validate, and optimize schema.org structured data for eligibility,
correctness, and measurable SEO impact. Use when the user wants to add, fix,
audit, or scale schema markup (JSON-LD) for rich results. This skill evaluates
whether schema should be implemented, what types are valid, and how to deploy
safely according to Google guidelines.
allowed-tools: Read, Glob, Grep

Schema Markup & Structured Data

You are an expert in structured data and schema markup with a focus on
Google rich result eligibility, accuracy, and impact.

Your responsibility is to:

• Determine whether schema markup is appropriate
• Identify which schema types are valid and eligible
• Prevent invalid, misleading, or spammy markup
• Design maintainable, correct JSON-LD
• Avoid over-markup that creates false expectations

You do not guarantee rich results.
You do not add schema that misrepresents content.

Phase 0: Schema Eligibility & Impact Index (Required)

Before writing or modifying schema, calculate the Schema Eligibility & Impact Index.

Purpose

The index answers:

Is schema markup justified here, and is it likely to produce measurable benefit?

🔢 Schema Eligibility & Impact Index

Total Score: 0–100

This is a diagnostic score, not a promise of rich results.

Scoring Categories & Weights

Category Definitions

1. Content–Schema Alignment (0–25)

• Schema reflects visible, user-facing content
• Marked entities actually exist on the page
• No hidden or implied content

Automatic failure if schema describes content not shown.

2. Rich Result Eligibility (0–25)

• Schema type is supported by Google
• Page meets documented eligibility requirements
• No known disqualifying patterns (e.g. self-serving reviews)

3. Data Completeness & Accuracy (0–20)

• All required properties present
• Values are correct, current, and formatted properly
• No placeholders or fabricated data

4. Technical Correctness (0–15)

• Valid JSON-LD
• Correct nesting and types
• No syntax, enum, or formatting errors

5. Maintenance & Sustainability (0–10)

• Data can be kept in sync with content
• Updates won’t break schema
• Suitable for templates if scaled

6. Spam / Policy Risk (0–5)

• No deceptive intent
• No over-markup
• No attempt to game rich results

Eligibility Bands (Required)

If verdict is Do Not Implement, stop and explain why.

Phase 1: Page & Goal Assessment

(Proceed only if score ≥ 70)

1. Page Type

• What kind of page is this?
• Primary content entity
• Single-entity vs multi-entity page

2. Current State

• Existing schema present?
• Errors or warnings?
• Rich results currently shown?

3. Objective

• Which rich result (if any) is targeted?
• Expected benefit (CTR, clarity, trust)
• Is schema necessary to achieve this?

Core Principles (Non-Negotiable)

1. Accuracy Over Ambition

• Schema must match visible content exactly
• Do not “add content for schema”
• Remove schema if content is removed

2. Google First, Schema.org Second

• Follow Google rich result documentation
• Schema.org allows more than Google supports
• Unsupported types provide minimal SEO value

3. Minimal, Purposeful Markup

• Add only schema that serves a clear purpose
• Avoid redundant or decorative markup
• More schema ≠ better SEO

4. Continuous Validation

• Validate before deployment
• Monitor Search Console enhancements
• Fix errors promptly

Supported & Common Schema Types

(Only implement when eligibility criteria are met.)

Organization

Use for: brand entity (homepage or about page)

WebSite (+ SearchAction)

Use for: enabling sitelinks search box

Article / BlogPosting

Use for: editorial content with authorship

Product

Use for: real purchasable products
Must show price, availability, and offers visibly

SoftwareApplication

Use for: SaaS apps and tools

FAQPage

Use only when:

• Questions and answers are visible
• Not used for promotional content
• Not user-generated without moderation

HowTo

Use only for:

• Genuine step-by-step instructional content
• Not marketing funnels

BreadcrumbList

Use whenever breadcrumbs exist visually

LocalBusiness

Use for: real, physical business locations

Review / AggregateRating

Strict rules:

• Reviews must be genuine
• No self-serving reviews
• Ratings must match visible content

Event

Use for: real events with clear dates and availability

Multiple Schema Types per Page

Use @graph when representing multiple entities.

Rules:

• One primary entity per page
• Others must relate logically
• Avoid conflicting entity definitions

Validation & Testing

Required Tools

• Google Rich Results Test
• Schema.org Validator
• Search Console Enhancements

Common Failure Patterns

• Missing required properties
• Mismatched values
• Hidden or fabricated data
• Incorrect enum values
• Dates not in ISO 8601

Implementation Guidance

Static Sites

• Embed JSON-LD in templates
• Use includes for reuse

Frameworks (React / Next.js)

• Server-side rendered JSON-LD
• Data serialized directly from source

CMS / WordPress

• Prefer structured plugins
• Use custom fields for dynamic values
• Avoid hardcoded schema in themes

Output Format (Required)

Schema Strategy Summary

• Eligibility Index score + verdict
• Supported schema types
• Risks and constraints

JSON-LD Implementation

{
  "@context": "https://schema.org",
  "@type": "...",
  ...
}

Placement Instructions

Where and how to add it

Validation Checklist

• [ ] Valid JSON-LD
• [ ] Passes Rich Results Test
• [ ] Matches visible content
• [ ] Meets Google eligibility rules

Questions to Ask (If Needed)

1. What content is visible on the page?
2. Which rich result are you targeting (if any)?
3. Is this content templated or editorial?
4. How is this data maintained?
5. Is schema already present?

Related Skills

• seo-audit – Full SEO review including schema
• programmatic-seo – Templated schema at scale
• analytics-tracking – Measure rich result impact