Agent skill

Check Urls

by rajbos in rajbos/ai-engineering-fluency

Find all hardcoded URLs in TypeScript source files and verify they resolve (return HTTP 2xx/3xx).

MITAuto-check passedDevelopment

Install Check Urls

skills CLI

$ npx skills add rajbos/ai-engineering-fluency --skill check-urls -a claude-code

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

GitHub CLI

$ gh skill install rajbos/ai-engineering-fluency check-urls --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/rajbos/ai-engineering-fluency.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/check-urls .claude/skills/check-urls && 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/

Paste into Claude Code

Install the "check-urls" agent skill from https://github.com/rajbos/ai-engineering-fluency/tree/main/.claude/skills/check-urls into .claude/skills/check-urls/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "check-urls", 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

$skill-installer install https://github.com/rajbos/ai-engineering-fluency/tree/main/.claude/skills/check-urls

Type 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.

skills CLI

$ npx skills add rajbos/ai-engineering-fluency --skill check-urls -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install rajbos/ai-engineering-fluency check-urls --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/rajbos/ai-engineering-fluency.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/check-urls .agents/skills/check-urls && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "check-urls" agent skill from https://github.com/rajbos/ai-engineering-fluency/tree/main/.claude/skills/check-urls into .agents/skills/check-urls/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "check-urls", 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.

skills CLI

$ npx skills add rajbos/ai-engineering-fluency --skill check-urls -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install rajbos/ai-engineering-fluency check-urls --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/rajbos/ai-engineering-fluency.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/check-urls .cursor/skills/check-urls && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "check-urls" agent skill from https://github.com/rajbos/ai-engineering-fluency/tree/main/.claude/skills/check-urls into .cursor/skills/check-urls/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "check-urls", 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

$ gemini skills install https://github.com/rajbos/ai-engineering-fluency.git --path .claude/skills/check-urls

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add rajbos/ai-engineering-fluency --skill check-urls -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install rajbos/ai-engineering-fluency check-urls --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/rajbos/ai-engineering-fluency.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/check-urls .gemini/skills/check-urls && rm -rf skills-src

Use ~/.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/

Paste into Gemini CLI

Install the "check-urls" agent skill from https://github.com/rajbos/ai-engineering-fluency/tree/main/.claude/skills/check-urls into .gemini/skills/check-urls/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "check-urls", 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.

GitHub CLI

$ gh skill install rajbos/ai-engineering-fluency check-urls

Installs 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).

skills CLI

$ npx skills add rajbos/ai-engineering-fluency --skill check-urls -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/rajbos/ai-engineering-fluency.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/check-urls .github/skills/check-urls && rm -rf skills-src

Use ~/.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/

Paste into GitHub Copilot

Install the "check-urls" agent skill from https://github.com/rajbos/ai-engineering-fluency/tree/main/.claude/skills/check-urls into .github/skills/check-urls/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "check-urls", 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.

skills CLI

$ npx skills add rajbos/ai-engineering-fluency --skill check-urls -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install rajbos/ai-engineering-fluency check-urls --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/rajbos/ai-engineering-fluency.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/check-urls .opencode/skills/check-urls && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "check-urls" agent skill from https://github.com/rajbos/ai-engineering-fluency/tree/main/.claude/skills/check-urls into .opencode/skills/check-urls/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "check-urls", 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: check-urls
GitHub stars: 117
Token cost: ~662 tokens
SKILL.md length: 345 words
Files: 1
Skills in repo: 21
Repo updated: Oct 10, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Find all hardcoded URLs in TypeScript source files and verify they resolve (return HTTP 2xx/3xx).

Works in 6 steps: Recursively scan every *.ts file under… → Extract all unique https?://... URLs… → Send an HTTP HEAD request to each URL… → …
You want to validate that links in tips
SKILL.md covers When to Use This Skill, Running the Check, Interpreting Output and After Finding Broken URLs, plus 1 more section
Calls node and npm; reaches tech.hub.ms

What it does

Check Urls is an agent skill from rajbos/ai-engineering-fluency. Find all hardcoded URLs in TypeScript source files and verify they resolve (return HTTP 2xx/3xx). Use when you want to validate that links in tips, hints, and documentation strings are still live.

Its SKILL.md is about 660 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Development. It works with TypeScript and Visual Studio Code. The repository describes itself as: Extension that shows information about the estimated token usage and more of AI in editors/CLI's. The licence is MIT.

When your agent uses it

You want to validate that links in tips
Documentation strings are still live

Example prompts

“/check-urls”

Requirements

Node.js

Workflow steps

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

Recursively scan every *.ts file under src/
Extract all unique https?://... URLs (strips trailing punctuation, skips template literals)
Send an HTTP HEAD request to each URL (with a 10-second timeout)
If HEAD returns any 4xx status, automatically retry with GET — some servers (e.g. intent URLs, social sharing endpoints) return 404/405…
Print a summary showing ✅ OK, ⚠️ REDIRECT, or ❌ BROKEN for every URL
Exit with code 1 if any URL returns a 4xx or 5xx status on both HEAD and GET, or times out

What it can do on your machine

Read from SKILL.md and the folder at commit 7b4f317. 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
Shell commands in SKILL.md call:
- node
- npm
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:
- tech.hub.ms
Also links to:
- code.visualstudio.com
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

Check Urls loads about 662 tokens when it runs. Until then it costs about 52 tokens; SKILL.md has 345 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~52
When it runs · the whole SKILL.md, loaded when a task matches: ~662

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 rajbos/ai-engineering-fluency at commit 7b4f317, republished under its MIT licence (© rajbos). 345 words, ~662 tokens.

Download SKILL.mdSave it as .claude/skills/check-urls/SKILL.md (or your agent's skills folder).

name: check-urls
description: Find all hardcoded URLs in TypeScript source files and verify they resolve (return HTTP 2xx/3xx). Use when you want to validate that links in tips, hints, and documentation strings are still live.

Check URLs Skill

This skill scans all TypeScript source files for hardcoded http:// and https:// URLs and performs HTTP HEAD requests to verify each one resolves without a 4xx/5xx error.

When to Use This Skill

Use this skill when you need to:

Validate links added to fluency hints or tips in maturityScoring.ts
Check that VS Code docs URLs, tech.hub.ms video links, or any other hardcoded URLs are still live
Audit the codebase after bulk URL changes to catch 404s before a release
Routinely health-check external references as part of a maintenance pass

Running the Check

bash

node .github/skills/check-urls/check-urls.js

The script will:

Recursively scan every *.ts file under src/
Extract all unique https?://... URLs (strips trailing punctuation, skips template literals)
Send an HTTP HEAD request to each URL (with a 10-second timeout)
If HEAD returns any 4xx status, automatically retry with GET — some servers (e.g. intent URLs, social sharing endpoints) return 404/405 for HEAD but correctly respond to GET
Print a summary showing ✅ OK, ⚠️ REDIRECT, or ❌ BROKEN for every URL
Exit with code 1 if any URL returns a 4xx or 5xx status on both HEAD and GET, or times out

Interpreting Output

Symbol	Meaning
✅ OK	2xx response — URL is live
⚠️ REDIRECT	3xx response — URL redirects; consider updating to the final destination
❌ BROKEN	4xx/5xx or connection failure — URL must be fixed

After Finding Broken URLs

404 on tech.hub.ms: The slug may have changed or the page was removed. Check https://tech.hub.ms to find the replacement and update src/maturityScoring.ts.
404 on code.visualstudio.com: The VS Code docs may have been reorganised. Search VS Code docs for the relevant topic and update the link.
Timeout: May be a transient network issue. Re-run the script to confirm before changing anything.
After fixing, re-run node .github/skills/check-urls/check-urls.js to confirm all URLs resolve.
Run npm --prefix vscode-extension run validate to confirm type-checking, linting, and the build still pass.

Files in This Directory

SKILL.md — This file; instructions for the skill
check-urls.js — Node.js script that performs the URL scan and resolution check
README.md — Short overview of the skill

Files

Just SKILL.md in .claude/skills/check-urls of rajbos/ai-engineering-fluency.

Open the folder on GitHubat commit 7b4f317

Compare with similar skills

Check Urls 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.

Check Urls compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Check Urls this skillrajbos/ai-engineering-fluency	117	—	~662	Automated safety check: Pass	MIT	today
Trust CI Release GatesjohannesPettersson80/trust-platform	222	—	~3.6k	Automated safety check: Pass	Apache-2.0	today
Prepare Rslint npm Releaseweb-infra-dev/rslint	461	—	~1.5k	Automated safety check: Pass	MIT	today
Typescripttahabasri/snippets	170	—	~968	Automated safety check: Pass	MIT	3 mo ago
Debug CIweb-infra-dev/rslint	461	—	~2.8k	Automated safety check: Pass	MIT	today
Typescript Styletjx666/vscode-mcp	105	—	~961	Automated safety check: Pass	Custom licence	2 mo ago

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Works with

Questions about Check Urls

What does Check Urls do?

Find all hardcoded URLs in TypeScript source files and verify they resolve (return HTTP 2xx/3xx). Check Urls is an agent skill from rajbos/ai-engineering-fluency. Find all hardcoded URLs in TypeScript source files and verify they resolve (return HTTP 2xx/3xx).

When should I use Check Urls?

Check Urls fits situations like: you want to validate that links in tips; documentation strings are still live.

How do I install Check Urls in Claude Code?

Run `npx skills add rajbos/ai-engineering-fluency --skill check-urls -a claude-code`. Or copy the skill folder (.claude/skills/check-urls in rajbos/ai-engineering-fluency) into .claude/skills/check-urls in your project. Claude Code loads it when a task matches its description.

How do I install Check Urls in Codex?

Run `npx skills add rajbos/ai-engineering-fluency --skill check-urls -a codex`. Or copy the skill folder (.claude/skills/check-urls in rajbos/ai-engineering-fluency) into .agents/skills/check-urls in your project. Codex loads it when a task matches its description.

Can I use Check Urls 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 rajbos/ai-engineering-fluency --skill check-urls -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/check-urls, .gemini/skills/check-urls, .github/skills/check-urls and .opencode/skills/check-urls in your project.

What does Check Urls need to run?

Going by SKILL.md and its folder, Check Urls needs the command-line tools its instructions call (node and npm). Our summary lists: Node.js.

Does Check Urls access the network?

SKILL.md names 2 domains. In commands or code: tech.hub.ms; the agent is likely to contact it when it follows the instructions. As links in the text: code.visualstudio.com. This is read from the text; nothing was executed.

Is Check Urls 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 Check Urls use?

Check Urls 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 Check Urls use?

About 662 tokens (SKILL.md is roughly 2.6k 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 Check Urls?

Skills that share tags, products or a category with Check Urls: Trust CI Release Gates (johannesPettersson80/trust-platform, 222 stars), Prepare Rslint npm Release (web-infra-dev/rslint, 461 stars), Typescript (tahabasri/snippets, 170 stars) and Debug CI (web-infra-dev/rslint, 461 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Check Urls?

rajbos (a GitHub user) maintains it in rajbos/ai-engineering-fluency, which has 117 GitHub stars. The repository holds 21 skills in this directory. The repository was last updated on October 10, 2026.

Source: rajbos/ai-engineering-fluency on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Check Urls

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Check URLs Skill

When to Use This Skill

Running the Check

Interpreting Output

After Finding Broken URLs

Files in This Directory

Files

Compare with similar skills

Similar skills

More from rajbos/ai-engineering-fluency

Related

Questions about Check Urls