Google SEO APIs
AgriciDaniel/claude-seo
Pulls real Google data for SEO work: Search Console, PageSpeed Insights, CrUX field data, the Indexing API and GA4 organic traffic, through /seo google commands.
A skill your agent uses when applies to any site with a dynamically generated or manually maintained XML sitemap.
Install Sitemap 4xx
$ npx skills add thedaviddias/Front-End-Checklist --skill sitemap-4xx -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install thedaviddias/Front-End-Checklist sitemap-4xx --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/sitemap-4xx .claude/skills/sitemap-4xx && rm -rf skills-srcUse ~/.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/
Install the "sitemap-4xx" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/sitemap-4xx into .claude/skills/sitemap-4xx/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sitemap-4xx", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/sitemap-4xxType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add thedaviddias/Front-End-Checklist --skill sitemap-4xx -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install thedaviddias/Front-End-Checklist sitemap-4xx --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/sitemap-4xx .agents/skills/sitemap-4xx && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "sitemap-4xx" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/sitemap-4xx into .agents/skills/sitemap-4xx/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sitemap-4xx", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add thedaviddias/Front-End-Checklist --skill sitemap-4xx -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install thedaviddias/Front-End-Checklist sitemap-4xx --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/sitemap-4xx .cursor/skills/sitemap-4xx && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "sitemap-4xx" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/sitemap-4xx into .cursor/skills/sitemap-4xx/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sitemap-4xx", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/thedaviddias/Front-End-Checklist.git --path skills/sitemap-4xx--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add thedaviddias/Front-End-Checklist --skill sitemap-4xx -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install thedaviddias/Front-End-Checklist sitemap-4xx --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/sitemap-4xx .gemini/skills/sitemap-4xx && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "sitemap-4xx" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/sitemap-4xx into .gemini/skills/sitemap-4xx/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sitemap-4xx", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install thedaviddias/Front-End-Checklist sitemap-4xxInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add thedaviddias/Front-End-Checklist --skill sitemap-4xx -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/sitemap-4xx .github/skills/sitemap-4xx && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "sitemap-4xx" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/sitemap-4xx into .github/skills/sitemap-4xx/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sitemap-4xx", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add thedaviddias/Front-End-Checklist --skill sitemap-4xx -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install thedaviddias/Front-End-Checklist sitemap-4xx --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/sitemap-4xx .opencode/skills/sitemap-4xx && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "sitemap-4xx" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/sitemap-4xx into .opencode/skills/sitemap-4xx/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sitemap-4xx", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
sitemap-4xx- GitHub stars
- 74k
- Token cost
- ~519 tokens
- SKILL.md length
- 252 words
- Files
- 2 (incl. references)
- Skills in repo
- 390
- Repo updated
- First seen
- Licence
- MIT
At a glance
A skill your agent uses when applies to any site with a dynamically generated or manually maintained XML sitemap.
- Applies to any site with a dynamically generated
- SKILL.md covers Quick Reference, Check, Fix and Explain, plus 1 more section
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Manually maintained XML sitemap
What it does
Sitemap 4xx is an agent skill from thedaviddias/Front-End-Checklist. Use when applies to any site with a dynamically generated or manually maintained XML sitemap. Use when investigating crawl errors or after a site migration that removed pages.
Its SKILL.md is about 520 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/rule.md`).
It sits in Marketing & SEO, covering Technical SEO. It works with Google Search Console. The repository describes itself as: 🗂 The essential checklist for modern web development, for humans and AI agents. The licence is MIT.
When your agent uses it
- Applies to any site with a dynamically generated
- Manually maintained XML sitemap
- Investigating crawl errors
- After a site migration that removed pages
Example prompts
- “/sitemap-4xx”
What it can do on your machine
Read from SKILL.md and the folder at commit e8d14d0. 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.
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
frontendchecklist.io
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
Sitemap 4xx loads about 519 tokens when it runs, and up to ~1.4k if it reads all its reference files. Until then it costs about 47 tokens; SKILL.md has 252 words of instructions outside code blocks.
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 thedaviddias/Front-End-Checklist at commit e8d14d0, republished under its MIT licence (© thedaviddias). 252 words, ~519 tokens.
Download SKILL.mdSave it as
.claude/skills/sitemap-4xx/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- sitemap-4xx
- description
- Use when applies to any site with a dynamically generated or manually maintained XML sitemap. Use when investigating crawl errors or after a site migration that removed pages.
- metadata.category
- seo
- metadata.priority
- high
- metadata.difficulty
- intermediate
- metadata.estimatedTime
- 10
- metadata.source
- frontendchecklist.io
- metadata.url
- https://frontendchecklist.io/rules/seo/sitemap-4xx
4XX Pages in Sitemap
Including 4XX URLs in a sitemap signals poor site maintenance to Google, wastes crawl budget on non-existent pages, and generates errors in Search Console that can mask real indexing issues.
Quick Reference
- Sitemaps should only contain URLs that return HTTP 200 and are indexable
- 4XX URLs in a sitemap waste crawl budget and cause Search Console errors
- Remove 404 pages from the sitemap or set up proper 301 redirects before adding them
- Monitor the sitemap regularly — deleted content must be removed from sitemaps promptly
Check
Fetch all URLs listed in the sitemap and record their HTTP status codes. Flag any URL returning 4XX (404 Not Found, 410 Gone, 403 Forbidden). Cross-reference against Google Search Console → Coverage for corroborating data.
Fix
For each 4XX URL: if the content moved, set up a 301 redirect to the new URL and add the new URL to the sitemap. If the content is permanently gone, return 410 Gone and remove the URL from the sitemap. Regenerate and resubmit the sitemap.
Explain
Explain why sitemaps must only contain live, indexable URLs, how 4XX URLs in sitemaps affect crawl budget allocation, and the difference between 404 and 410 status codes for deindexing.
Code Review
Review metadata generation, rendered HTML, structured data, and response headers related to 4XX Pages in Sitemap. Flag exact routes or templates where search-facing output violates the rule, and describe how to verify the final page output.
For full implementation details, code examples, and framework-specific guidance,
see references/rule.md.
Rule page: https://frontendchecklist.io/rules/seo/sitemap-4xx
© thedaviddias, 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 (references) in skills/sitemap-4xx of thedaviddias/Front-End-Checklist.
- SKILL.md
- references/rule.md
Open the folder on GitHubat commit e8d14d0
Compare with similar skills
Sitemap 4xx 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Sitemap 4xx this skillthedaviddias/Front-End-Checklist | 74k | — | ~519 | Automated safety check: Pass | MIT | |
| Google SEO APIsAgriciDaniel/claude-seo | 19k | 1 repos | ~4.2k | Automated safety check: Pass | MIT | |
| SEO Coachakseolabs-seo/seo-coach | 146 | — | ~2.8k | Automated safety check: Pass | None | |
| SEO Setupalisamadiii/Portfolio | 180 | — | ~1.7k | Automated safety check: Pass | None | |
| Google Search SEO Guidelittleben/awesomeAgentskills | 189 | 2 repos | ~4.2k | Automated safety check: Pass | MIT | |
| SEO Googleseranking/seo-skills | 161 | — | ~4.8k | Automated safety check: Pass | MIT |
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Related
Works with
Categories
Questions about Sitemap 4xx
What does Sitemap 4xx do?
A skill your agent uses when applies to any site with a dynamically generated or manually maintained XML sitemap. Sitemap 4xx is an agent skill from thedaviddias/Front-End-Checklist. Use when applies to any site with a dynamically generated or manually maintained XML sitemap.
When should I use Sitemap 4xx?
Sitemap 4xx fits situations like: applies to any site with a dynamically generated; manually maintained XML sitemap; investigating crawl errors; after a site migration that removed pages.
How do I install Sitemap 4xx in Claude Code?
Run `npx skills add thedaviddias/Front-End-Checklist --skill sitemap-4xx -a claude-code`. Or copy the skill folder (skills/sitemap-4xx in thedaviddias/Front-End-Checklist) into .claude/skills/sitemap-4xx in your project. Claude Code loads it when a task matches its description.
How do I install Sitemap 4xx in Codex?
Run `npx skills add thedaviddias/Front-End-Checklist --skill sitemap-4xx -a codex`. Or copy the skill folder (skills/sitemap-4xx in thedaviddias/Front-End-Checklist) into .agents/skills/sitemap-4xx in your project. Codex loads it when a task matches its description.
Can I use Sitemap 4xx 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 thedaviddias/Front-End-Checklist --skill sitemap-4xx -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/sitemap-4xx, .gemini/skills/sitemap-4xx, .github/skills/sitemap-4xx and .opencode/skills/sitemap-4xx in your project.
What does Sitemap 4xx need to run?
SKILL.md names no scripts, command-line tools or credentials: Sitemap 4xx is instructions for the agent only.
Does Sitemap 4xx access the network?
SKILL.md names 1 domain. As links in the text: frontendchecklist.io. This is read from the text; nothing was executed.
Is Sitemap 4xx 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 Sitemap 4xx use?
Sitemap 4xx is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Sitemap 4xx use?
About 519 tokens (SKILL.md is roughly 2.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 915 tokens, read only when the agent opens those files.
What are the alternatives to Sitemap 4xx?
Skills that share tags, products or a category with Sitemap 4xx: Google SEO APIs (AgriciDaniel/claude-seo, 19k stars), SEO Coach (akseolabs-seo/seo-coach, 146 stars), SEO Setup (alisamadiii/Portfolio, 180 stars) and Google Search SEO Guide (littleben/awesomeAgentskills, 189 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Sitemap 4xx?
thedaviddias (a GitHub user) maintains it in thedaviddias/Front-End-Checklist, which has 74,421 GitHub stars. The repository holds 390 skills in this directory. The repository was last updated on October 6, 2026.
Source: thedaviddias/Front-End-Checklist on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.