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Agent skill

SEO Schema

by AgriciDaniel in AgriciDaniel/codex-seo

Detect, validate, and generate Schema.org structured data. An agent skill from AgriciDaniel/codex-seo.

MITAuto-check passedMarketing & SEO

Install SEO Schema

skills CLI
$ npx skills add AgriciDaniel/codex-seo --skill seo-schema -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install AgriciDaniel/codex-seo seo-schema --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/AgriciDaniel/codex-seo.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/seo-schema .claude/skills/seo-schema && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
seo-schema
GitHub stars
797
Used in
5 other repos
Token cost
~1.6k tokens
SKILL.md length
565 words
Files
2
Skills in repo
18
Repo updated
First seen
Licence
MIT

At a glance

Detect, validate, and generate Schema.org structured data. An agent skill from AgriciDaniel/codex-seo.

  • Works in 4 steps: Scan page source for JSON-LD → Check for Microdata (itemscope, itemprop) → Check for RDFa (typeof, property) → …
  • User says schema
  • SKILL.md covers Shared Data Cache, Detection, Validation and Schema Type Status (as of Feb…, plus 5 more sections
  • Reaches schema.org

What it does

SEO Schema is an agent skill from AgriciDaniel/codex-seo. Detect, validate, and generate Schema.org structured data. JSON-LD format preferred. Use when user says "schema", "structured data", "rich results", "JSON-LD", or "markup".

Its SKILL.md is about 1.6k tokens, which your agent loads only when the skill is triggered. The skill folder holds 1 other file.

It sits in Marketing & SEO, covering Schema markup. The repository describes itself as: Codex-first SEO skill suite. 26 workflows, 24 TOML agents, DataForSEO/Gemini/Google/Firecrawl integrations, GEO/AEO, CWV, schema, backlinks, local/maps, and deterministic reports. The licence is MIT.

When your agent uses it

  • User says schema
  • Structured data

Example prompts

  • “schema”
  • “structured data”
  • “rich results”
  • “/seo-schema”

Workflow steps

4 steps, taken from the first numbered list in SKILL.md.

  1. Scan page source for JSON-LD
  2. Check for Microdata (itemscope, itemprop)
  3. Check for RDFa (typeof, property)
  4. Always recommend JSON-LD as primary format (Google's stated preference)

What it can do on your machine

Read from SKILL.md and the folder at commit 9a644f6. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are json).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    Hosts in commands or code, which the agent is likely to contact:

    • schema.org

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

SEO Schema loads about 1.6k tokens when it runs. Until then it costs about 46 tokens; SKILL.md has 565 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~46
When it runs · the whole SKILL.md, loaded when a task matches
~1.6k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from AgriciDaniel/codex-seo at commit 9a644f6, republished under its MIT licence (© AgriciDaniel). 565 words, ~1,603 tokens.

Download SKILL.mdSave it as .claude/skills/seo-schema/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
seo-schema
description
Detect, validate, and generate Schema.org structured data. JSON-LD format preferred. Use when user says "schema", "structured data", "rich results", "JSON-LD", or "markup".
user-invokable
true
argument-hint
[url]
license
MIT
metadata.author
AgriciDaniel
metadata.version
1.9.6
metadata.category
seo

Schema Markup Analysis & Generation

Shared Data Cache

Step 0 -- Check shared data cache:

Before gathering, check .seo-cache/ for reusable context from related SEO skills. Reference: ../seo/references/shared-data-cache.md for schemas and dependency map.

Check these cache files when present:

  • .seo-cache/site-meta.json for domain, business type, industry, and crawl context

  • .seo-cache/audit-scores.json for prior full-audit priorities

  • .seo-cache/pages/{url-slug}/page-analysis.json for page-level context when a URL is provided

  • If found: parse and use clearly valid fields (note "Using cached [X] from [date]")

  • If missing, corrupt, or irrelevant: continue with fresh evidence

  • If the user says "refresh" or "re-run": ignore cache reads and overwrite on write

Detection

  1. Scan page source for JSON-LD <script type="application/ld+json">
  2. Check for Microdata (itemscope, itemprop)
  3. Check for RDFa (typeof, property)
  4. Always recommend JSON-LD as primary format (Google's stated preference)

Validation

  • Check required properties per schema type
  • Validate against Google's supported rich result types
  • Test for common errors:
    • Missing @context
    • Invalid @type
    • Wrong data types
    • Placeholder text
    • Relative URLs (should be absolute)
    • Invalid date formats
  • Flag deprecated types (see below)

Schema Type Status (as of Feb 2026)

Read references/schema-types.md for the full list. Key rules:

ACTIVE (recommend freely):

Organization, LocalBusiness, SoftwareApplication, WebApplication, Product (with Certification markup as of April 2025), ProductGroup, Offer, Service, Article, BlogPosting, NewsArticle, Review, AggregateRating, BreadcrumbList, WebSite, WebPage, Person, ProfilePage, ContactPage, VideoObject, ImageObject, Event, JobPosting, Course, DiscussionForumPosting

VIDEO & SPECIALIZED (recommend freely):

BroadcastEvent, Clip, SeekToAction, SoftwareSourceCode

See schema/templates.json for ready-to-use JSON-LD templates for these types.

JSON-LD and JavaScript rendering: Per Google's December 2025 JS SEO guidance, structured data injected via JavaScript may face delayed processing. For time-sensitive markup (especially Product, Offer), include JSON-LD in the initial server-rendered HTML.

RESTRICTED (only for specific sites):
  • FAQ: ONLY for government and healthcare authority sites (restricted Aug 2023)
DEPRECATED (never recommend):
  • HowTo: Rich results removed September 2023
  • SpecialAnnouncement: Deprecated July 31, 2025
  • CourseInfo, EstimatedSalary, LearningVideo: Retired June 2025
  • ClaimReview: Retired from rich results June 2025
  • VehicleListing: Retired from rich results June 2025
  • Practice Problem: Retired from rich results late 2025
  • Dataset: Retired from rich results late 2025
  • Book Actions: Deprecated then reversed, still functional as of Feb 2026 (historical note)
Show full SKILL.md (219 more words)Show less

Generation

When generating schema for a page:

  1. Identify page type from content analysis
  2. Select appropriate schema type(s)
  3. Generate valid JSON-LD with all required + recommended properties
  4. Include only truthful, verifiable data. Use placeholders clearly marked for user to fill
  5. Validate output before presenting

Common Schema Templates

Organization
json
{
  "@context": "https://schema.org",
  "@type": "Organization",
  "name": "[Company Name]",
  "url": "[Website URL]",
  "logo": "[Logo URL]",
  "contactPoint": {
    "@type": "ContactPoint",
    "telephone": "[Phone]",
    "contactType": "customer service"
  },
  "sameAs": [
    "[Facebook URL]",
    "[LinkedIn URL]",
    "[Twitter URL]"
  ]
}
LocalBusiness
json
{
  "@context": "https://schema.org",
  "@type": "LocalBusiness",
  "name": "[Business Name]",
  "address": {
    "@type": "PostalAddress",
    "streetAddress": "[Street]",
    "addressLocality": "[City]",
    "addressRegion": "[State]",
    "postalCode": "[ZIP]",
    "addressCountry": "US"
  },
  "telephone": "[Phone]",
  "openingHours": "Mo-Fr 09:00-17:00",
  "geo": {
    "@type": "GeoCoordinates",
    "latitude": "[Lat]",
    "longitude": "[Long]"
  }
}
Article/BlogPosting
json
{
  "@context": "https://schema.org",
  "@type": "Article",
  "headline": "[Title]",
  "author": {
    "@type": "Person",
    "name": "[Author Name]"
  },
  "datePublished": "[YYYY-MM-DD]",
  "dateModified": "[YYYY-MM-DD]",
  "image": "[Image URL]",
  "publisher": {
    "@type": "Organization",
    "name": "[Publisher]",
    "logo": {
      "@type": "ImageObject",
      "url": "[Logo URL]"
    }
  }
}

Output

  • SCHEMA-REPORT.md: detection and validation results
  • generated-schema.json: ready-to-use JSON-LD snippets
Validation Results
SchemaTypeStatusIssues
......✅/⚠️/❌...
Recommendations
  • Missing schema opportunities
  • Validation fixes needed
  • Generated code for implementation

Error Handling

ScenarioAction
URL unreachableReport connection error with status code. Suggest verifying URL and checking if the page requires authentication.
No schema markup foundReport that no JSON-LD, Microdata, or RDFa was detected. Recommend appropriate schema types based on page content analysis.
Invalid JSON-LD syntaxParse and report specific syntax errors (missing brackets, trailing commas, unquoted keys). Provide corrected JSON-LD output.
Deprecated schema type detectedFlag the deprecated type with its retirement date. Recommend the current replacement type or advise removal if no replacement exists.

Write to shared data cache

After completing all work, write a concise JSON summary to .seo-cache/ when the workflow produced durable findings. Use the schemas and naming rules in ../seo/references/shared-data-cache.md; include at least cache_type, analyzed_at, source URL/domain, key findings, issues, recommendations, and tool limitations. Add .seo-cache/ to .gitignore if it is missing.

© AgriciDaniel, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 1 other file in skills/seo-schema of AgriciDaniel/codex-seo.

  • SKILL.md
  • LICENSE.txt

Open the folder on GitHubat commit 9a644f6

Used in 6 other repositories

We found 17 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 5 other GitHub owners. This page covers the copy in AgriciDaniel/codex-seo, which our catalogue first saw on October 7, 2026.

Compare with similar skills

SEO Schema next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

SEO Schema compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
SEO Schema this skillAgriciDaniel/codex-seo7975 repos~1.6kAutomated safety check: PassMIT
SEO GeoReScienceLab/opc-skills1.8k4 repos~2.1kAutomated safety check: PassApache-2.0
GEO-First SEO Audit Toolzubair-trabzada/geo-seo-claude11k—~2.8kAutomated safety check: NotesMIT
SEO Optimizerailabs-393/ai-labs-claude-skills4541 repos~3.2kAutomated safety check: PassMIT
Portaljs Add Dcatdatopian/portaljs2.4k1 repos~1.8kAutomated safety check: PassMIT
Schema Markupfreekmurze/dotfiles1k15 repos~1.2kAutomated safety check: PassNone

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Categories

Questions about SEO Schema

What does SEO Schema do?

Detect, validate, and generate Schema.org structured data. An agent skill from AgriciDaniel/codex-seo. SEO Schema is an agent skill from AgriciDaniel/codex-seo.org structured data.

When should I use SEO Schema?

SEO Schema fits situations like: user says schema; structured data.

How do I install SEO Schema in Claude Code?

Run `npx skills add AgriciDaniel/codex-seo --skill seo-schema -a claude-code`. Or copy the skill folder (skills/seo-schema in AgriciDaniel/codex-seo) into .claude/skills/seo-schema in your project. Claude Code loads it when a task matches its description.

How do I install SEO Schema in Codex?

Run `npx skills add AgriciDaniel/codex-seo --skill seo-schema -a codex`. Or copy the skill folder (skills/seo-schema in AgriciDaniel/codex-seo) into .agents/skills/seo-schema in your project. Codex loads it when a task matches its description.

Can I use SEO Schema in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add AgriciDaniel/codex-seo --skill seo-schema -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/seo-schema, .gemini/skills/seo-schema, .github/skills/seo-schema and .opencode/skills/seo-schema in your project.

What does SEO Schema need to run?

SKILL.md names no scripts, command-line tools or credentials: SEO Schema is instructions for the agent only.

Does SEO Schema access the network?

SKILL.md names 1 domain. In commands or code: schema.org; the agent is likely to contact it when it follows the instructions. This is read from the text; nothing was executed.

Is SEO Schema safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does SEO Schema use?

SEO Schema is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does SEO Schema use?

About 1.6k tokens (SKILL.md is roughly 6.4k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to SEO Schema?

Skills that share tags, products or a category with SEO Schema: SEO Geo (ReScienceLab/opc-skills, 1.8k stars), GEO-First SEO Audit Tool (zubair-trabzada/geo-seo-claude, 11k stars), SEO Optimizer (ailabs-393/ai-labs-claude-skills, 454 stars) and Portaljs Add Dcat (datopian/portaljs, 2.4k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains SEO Schema?

AgriciDaniel (a GitHub user) maintains it in AgriciDaniel/codex-seo, which has 797 GitHub stars. The repository holds 18 skills in this directory. The repository was last updated on September 11, 2026.

Source: AgriciDaniel/codex-seo on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.