Sites
asgeirtj/system_prompts_leaks
A skill your agent uses when creating or updating a website, web app, or browser game, or when a visual layout or interactive tool would help with what the user is doing.
A skill your agent uses when applies to any site with user-generated slugs, CMS-generated URLs, or content in non-English languages.
MITAuto-check passed
Install Special Chars
$ npx skills add thedaviddias/Front-End-Checklist --skill special-chars -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install thedaviddias/Front-End-Checklist special-chars --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/special-chars .claude/skills/special-chars && 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 "special-chars" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/special-chars into .claude/skills/special-chars/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "special-chars", 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/special-charsType 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 special-chars -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install thedaviddias/Front-End-Checklist special-chars --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/special-chars .agents/skills/special-chars && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "special-chars" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/special-chars into .agents/skills/special-chars/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "special-chars", 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 special-chars -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install thedaviddias/Front-End-Checklist special-chars --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/special-chars .cursor/skills/special-chars && 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 "special-chars" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/special-chars into .cursor/skills/special-chars/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "special-chars", 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/special-chars--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 special-chars -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install thedaviddias/Front-End-Checklist special-chars --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/special-chars .gemini/skills/special-chars && 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 "special-chars" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/special-chars into .gemini/skills/special-chars/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "special-chars", 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 special-charsInstalls 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 special-chars -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/special-chars .github/skills/special-chars && 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 "special-chars" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/special-chars into .github/skills/special-chars/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "special-chars", 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 special-chars -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 special-chars --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/special-chars .opencode/skills/special-chars && 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 "special-chars" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/special-chars into .opencode/skills/special-chars/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "special-chars", 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
special-chars- GitHub stars
- 74k
- Token cost
- ~561 tokens
- SKILL.md length
- 236 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 user-generated slugs, CMS-generated URLs, or content in non-English languages.
- Applies to any site with user-generated slugs
- 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
- CMS-generated URLs
What it does
Special Chars is an agent skill from thedaviddias/Front-End-Checklist. Use when applies to any site with user-generated slugs, CMS-generated URLs, or content in non-English languages. Use when auditing URLs for crawl errors or canonicalization issues.
Its SKILL.md is about 560 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`).
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 user-generated slugs
- CMS-generated URLs
- Content in non-English languages
- Auditing URLs for crawl errors
Example prompts
- “/special-chars”
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
Special Chars loads about 561 tokens when it runs, and up to ~1.6k if it reads all its reference files. Until then it costs about 49 tokens; SKILL.md has 236 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). 236 words, ~561 tokens.
Download SKILL.mdSave it as
.claude/skills/special-chars/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- special-chars
- description
- Use when applies to any site with user-generated slugs, CMS-generated URLs, or content in non-English languages. Use when auditing URLs for crawl errors or canonicalization issues.
- metadata.category
- seo
- metadata.priority
- medium
- metadata.difficulty
- beginner
- metadata.estimatedTime
- 10
- metadata.source
- frontendchecklist.io
- metadata.url
- https://frontendchecklist.io/rules/seo/special-chars
URL Special Characters
Special characters in URL paths cause inconsistent crawling, broken links when shared, and canonicalization failures when different systems encode them differently.
Quick Reference
- URL paths should contain only unreserved characters: A-Z, a-z, 0-9,
-,_,.,~ - Spaces must be encoded as
%20(not+, which is query-string syntax) - Characters like
#,?,&,=have reserved meaning in URLs and must be percent-encoded in path segments - Non-ASCII characters (accented letters, CJK) should be percent-encoded in URLs, though modern browsers decode them for display
Check
Scan all crawled URL paths for characters outside [A-Za-z0-9\-_./~]. Flag URLs containing spaces (%20 or literal), special symbols (#, ?, &, =, + in paths), or unencoded non-ASCII characters. Check if different encodings of the same URL return separate 200 responses.
Fix
Update the URL generation logic in your CMS or framework to strip or replace special characters. Replace spaces with hyphens. Percent-encode any reserved characters that must appear in paths. Set up redirects from problematic old URLs to clean new slugs.
Explain
Explain the difference between reserved and unreserved characters in RFC 3986, how browsers and crawlers handle inconsistent percent-encoding, and why special characters in paths create duplicate content risks.
Code Review
Review metadata generation, rendered HTML, structured data, and response headers related to URL Special Characters. 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/special-chars
© 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/special-chars of thedaviddias/Front-End-Checklist.
- SKILL.md
- references/rule.md
Open the folder on GitHubat commit e8d14d0
Compare with similar skills
Special Chars 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 |
|---|---|---|---|---|---|---|
| Special Chars this skillthedaviddias/Front-End-Checklist | 74k | — | ~561 | Automated safety check: Pass | MIT | |
| Sitesasgeirtj/system_prompts_leaks | 69k | — | ~1.6k | Automated safety check: Pass | CC0-1.0 | |
| Experience Cms Brand Applyforcedotcom/sf-skills | 1.1k | — | ~2.1k | Automated safety check: Pass | Apache-2.0 | |
| Site Mdgoogle-labs-code/stitch-skills | 8.5k | — | ~783 | Automated safety check: Pass | Apache-2.0 | |
| Static Sitesbionic-gpt/bionic-gpt | 2.4k | — | ~920 | Automated safety check: Pass | Apache-2.0 | |
| Wp Site Health Auditorsickn33/agentic-awesome-skills | 47k | 1 repos | ~4.8k | Automated safety check: Pass | MIT |
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forcedotcom/sf-skills
Extracts, retrieves, and applies CMS brand guidelines (voice, tone, style, colors, typography) to generated content.
- Official
Site Md
google-labs-code/stitch-skills
Analyze a project description or site requirements and synthesize a project constitution into SITE.md for the Stitch Build Loop
Static Sites
bionic-gpt/bionic-gpt
Create or modify Bionic's generated marketing site, documentation, blog, course pages, and static assets.
Wp Site Health Auditor
sickn33/agentic-awesome-skills
Turns a WordPress Site Health report into a risk-tiered, backup-first fix plan with exact WP-CLI/PHP snippets.
Site Architecture
alirezarezvani/claude-skills
When the user wants to audit, redesign, or plan their website's structure, URL hierarchy, navigation design, or internal linking strategy.
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Adds, checks and fixes FAQPage JSON-LD on pages with visible question-and-answer sections so it matches what readers see and can qualify for rich results.
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Audits article pages for freshness signals, covering the Last-Modified header, Article JSON-LD dateModified and a visible last-updated date, and fixes mismatches.
Geo Meta Tags Audit
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Audits and fixes geo.region, geo.placename and geo.position meta tags on regional pages, noting where they help (Bing) and where they do not (Google).
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Scores and rewrites a Front-End Checklist rule MDX file against a scored quality rubric, replacing generic stub prompts with specific, actionable ones.
Questions about Special Chars
What does Special Chars do?
A skill your agent uses when applies to any site with user-generated slugs, CMS-generated URLs, or content in non-English languages. Special Chars is an agent skill from thedaviddias/Front-End-Checklist. Use when applies to any site with user-generated slugs, CMS-generated URLs, or content in non-English languages.
When should I use Special Chars?
Special Chars fits situations like: applies to any site with user-generated slugs; CMS-generated URLs; content in non-English languages; auditing URLs for crawl errors.
How do I install Special Chars in Claude Code?
Run `npx skills add thedaviddias/Front-End-Checklist --skill special-chars -a claude-code`. Or copy the skill folder (skills/special-chars in thedaviddias/Front-End-Checklist) into .claude/skills/special-chars in your project. Claude Code loads it when a task matches its description.
How do I install Special Chars in Codex?
Run `npx skills add thedaviddias/Front-End-Checklist --skill special-chars -a codex`. Or copy the skill folder (skills/special-chars in thedaviddias/Front-End-Checklist) into .agents/skills/special-chars in your project. Codex loads it when a task matches its description.
Can I use Special Chars 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 special-chars -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/special-chars, .gemini/skills/special-chars, .github/skills/special-chars and .opencode/skills/special-chars in your project.
What does Special Chars need to run?
SKILL.md names no scripts, command-line tools or credentials: Special Chars is instructions for the agent only.
Does Special Chars 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 Special Chars 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 Special Chars use?
Special Chars 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 Special Chars use?
About 561 tokens (SKILL.md is roughly 2.2k 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 1.1k tokens, read only when the agent opens those files.
What are the alternatives to Special Chars?
Skills that share tags, products or a category with Special Chars: Sites (asgeirtj/system_prompts_leaks, 69k stars), Experience Cms Brand Apply (forcedotcom/sf-skills, 1.1k stars), Site Md (google-labs-code/stitch-skills, 8.5k stars) and Static Sites (bionic-gpt/bionic-gpt, 2.4k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Special Chars?
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.