Validate every user-provided URL through a positive-allowlist validator before it reaches AVPlayer, URLSession, or a WKWebView. Validate at both the manager and service boundaries (the duplication is intentional defense-in-depth). Known limitation: homograph / IDN look-alike hosts are not detected.
enum SecureURLValidator {
/// Returns true only when the URL satisfies every required property.
/// Known limitation: homograph / IDN look-alike hosts are not detected.
nonisolated static func validate(_ urlString: String) -> Bool {
guard !urlString.isEmpty else { return false }
guard urlString.utf8.count <= 2048 else { return false }
…Url Validation Security is a community-contributed Claude Code skill in the security-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/url-validation-security/ and loads when your prompt matches the skill's trigger.
When to invoke it: Use when validating a user-provided or externally-sourced URL before it reaches `AVPlayer`, `URLSession`, or a `WKWebView` — building a positive- allowlist URL validator, or reviewing existing networking/media code for missing URL validation.
The Url Validation Security Claude Code skill is built for security engineers, penetration testers, DevSecOps practitioners, and development teams hardening codebases and infrastructure. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 213,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).
mkdir -p ~/.claude/skills/url-validation-security curl -L https://claudskills.com/skills/url-validation-security/SKILL.md \ -o ~/.claude/skills/url-validation-security/SKILL.md
Or just download SKILL.md directly and drop it into ~/.claude/skills/url-validation-security/. Claude Code auto-discovers it on next session.
Skills live at ~/.claude/skills/url-validation-security/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\url-validation-security\SKILL.md on Windows. See the full install guide for step-by-step instructions.
Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →
The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.
For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.
SKILL.md from the source repository to ~/.claude/skills/url-validation-security/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Url Validation Security is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at /learn/what-is-a-claude-skill/.If you reference this skill in a blog post, paper, or documentation, you can cite it as:
@misc{url-validation-security-2026,
author = {patrickserrano},
title = {Url Validation Security [Claude Code skill]},
year = {2026},
publisher = {ClaudSkills},
url = {https://claudskills.com/skills/url-validation-security/}
}Grade A · scanned 2026-11-01 — free static scan against the OWASP Agentic Skills Top 10.
No risk patterns were found in any of the ten OWASP-aligned categories. How grading works ›
Browse all Security skills in the ClaudSkills registry, or explore these other picks from the same category:
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SKILL.md files, not affiliated with, endorsed by, or sponsored by Anthropic.