What is link-checker?

A website auditing tool that checks links between pages, links to other sites, images, and other referenced files. It also looks for insecure content, redirect chains, unreachable pages, and problematic email or social links.

Use it to audit a whole website for broken links, missing assets, mixed HTTP and HTTPS content, inefficient redirects, and pages that no other page links to.

It finds references that no longer work or are difficult for users and search engines to follow. The report groups issues by severity and explains how to fix them.

How mrhinkle/VibeCoding-a-Website configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to mrhinkle/VibeCoding-a-Website. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/mrhinkle/VibeCoding-a-Website/main/.claude/skills/link-checker/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/mrhinkle/VibeCoding-a-Website

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/mrhinkle/vibecoding-a-website/link-checker/github.svg)](https://agentmods.dev/skills/mrhinkle/vibecoding-a-website/link-checker)

Your own site

<a href="https://agentmods.dev/skills/mrhinkle/vibecoding-a-website/link-checker"><img src="https://agentmods.dev/badge/skills/mrhinkle/vibecoding-a-website/link-checker/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/mrhinkle/vibecoding-a-website/link-checker"><img src="https://agentmods.dev/badge/skills/mrhinkle/vibecoding-a-website/link-checker.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 0 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,894 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00000	$0.02894
Opus 5.5	$0.00000	$0.01158
Sonnet 5.5	$0.00000	$0.00579
Haiku 4.5	$0.00000	$0.00289

Measured 2mo ago against content hash 170d7ed988d3, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

link-checker scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/check_links.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.claude/skills/link-checker/SKILL.md · 377 lines

How it starts

The opening of the file, as written. The whole thing — 377 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Link Checker Skill

Skill Summary

The Link Checker crawls your entire website, validates every internal and external link, image, and asset reference, and identifies broken links, mixed content issues, redirect chains, orphaned pages, and email/social media link problems. It generates a comprehensive fix-it report with severity levels and remediation guidance.

Business Value: Broken links damage user experience, reduce SEO rankings (Google penalizes broken links), and suggest an abandoned or poorly maintained site. This skill prevents customer frustration and maintains your technical SEO health.

What This Skill Does

The Link Checker performs comprehensive link auditing:

Internal Link Validation - Checks all links between pages on your domain
External Link Checking - Validates all outbound links to third-party sites
Image/Asset Reference Validation - Ensures all images and resources load correctly
Mixed Content Detection - Flags insecure content on secure pages (HTTP on HTTPS)
Redirect Chain Detection - Identifies inefficient redirect chains (301 → 301 → 200)
Orphan Page Detection - Finds pages not linked from anywhere (unreachable)
Anchor Link Validation - Checks that hashtag links point to existing page sections
Email Link Validation - Verifies mailto: links have proper email addresses
Social Media Link Validation - Checks social media profiles are reachable
Reports and Prioritization - Generates fix-it report organized by severity

Why This Matters (Business Impact)

SEO Rankings: Google crawls links and penalizes broken links

Broken links increase bounce rate (bad signal to search engines)
Mixed content warnings prevent page indexing
Redirect chains waste crawl budget and slow page load
Orphaned pages don't rank because they're not discoverable

User Experience: Broken links frustrate visitors

Users land on 404 pages and leave (high bounce rate)
"Page not found" errors reduce trust
Slow redirects feel like broken links
Inaccessible resources prevent task completion

Read the full file on GitHub · 377 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

scripts/check_links.py 17 KB runs code

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 377 lines · 0 tokens per session scan A 170d7ed988d3

Subscribe to this mod's changes

link-checker is a skill published in the GitHub repository mrhinkle/VibeCoding-a-Website (17 stars, last pushed 6mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 2,894 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Debugging

link-checker next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
link-checkermrhinkle/VibeCoding-a-Website	Skill	17	6mo ago	MIT	A	0	Claude Code
systematic-debuggingopen-metadata/OpenMetadata	Skill	16k	yesterday	Apache-2.0	A	37	Claude Code
log-error-digestzebbern/claude-code-guide	Skill	4.7k	3d ago	MIT	A	71	Claude Code, Codex
cwv-optimizeradobe/skills	Skill	319	yesterday	Apache-2.0	A	112	Claude Code
ci-fixersipyourdrink-ltd/bernstein	Skill	1.2k	yesterday	Apache-2.0	A	15	Claude Code, Codex
incident-response-incident-responsermyndharis/antigravity-skills	Skill	1.9k	23d ago	MIT	A	36	Claude Code
triaging-web-analytics-supportPostHog/posthog	Skill	41k	yesterday	none	A	151	Claude Code, Codex

VibeCoding-a-Website: Skill for Claude Code