broken-link-checker

broken-link-checker is a skill for Claude Code from nowork-studio/notfair-plugin. It costs 70 tokens per session (159 once invoked), scanned A, original, MIT.

A website scanner that checks links and reports pages leading to errors such as 404 Not Found or 500 Server Error. It checks both internal links and links to other websites.

In plain words
What is it for?
Use it to crawl a website, find broken links, separate internal from external problems, group errors by status, and identify the source pages that need fixes.
Why use it?
It shows which links are broken and where they were found, so visitors and search engines are less likely to encounter dead ends.

Skill for Claude Code

Written for Claude Code: argument-hint in frontmatter.

Part of the notfair plugin — 48 skills, 1 MCP server shipped together

Good fit Use it to crawl a website, find broken links, separate internal from external problems, group errors by status, and identify the source pages that need fixes.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/nowork-studio/notfair-plugin/broken-link-checker
About the project

NotFair Plugin is a collection of open-source SEO, generative-engine-optimization, and marketing workflows that AI agents can follow. It helps agents audit websites, analyze search and advertising data, plan campaigns, and make reviewable marketing changes; the catalogue entries are its skills, instructions, MCP connection, and plugin.

nowork-studio/notfair-plugin · 4,059 stars · on GitHub · notfair.co

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add nowork-studio/notfair-plugin --skill broken-link-checker
Clone the repo
git clone --depth 1 https://github.com/nowork-studio/notfair-plugin

Made for: Claude Code.

Or install notfair, the plugin that ships this one along with the rest of its 48 skills, 1 MCP server.

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.

agentmods badge for broken-link-checker

README.md
[![agentmods](https://agentmods.dev/badge/skills/nowork-studio/notfair-plugin/broken-link-checker/github.svg)](https://agentmods.dev/skills/nowork-studio/notfair-plugin/broken-link-checker)
Your own site
<a href="https://agentmods.dev/skills/nowork-studio/notfair-plugin/broken-link-checker"><img src="https://agentmods.dev/badge/skills/nowork-studio/notfair-plugin/broken-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.

agentmods 80×15 button for broken-link-checker

Your own site · 80×15
<a href="https://agentmods.dev/skills/nowork-studio/notfair-plugin/broken-link-checker"><img src="https://agentmods.dev/badge/skills/nowork-studio/notfair-plugin/broken-link-checker.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 70 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 159 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. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00070 $0.00159
Opus 5.5 $0.00028 $0.00064
Sonnet 5.5 $0.00014 $0.00032
Haiku 4.5 $0.00007 $0.00016

Measured 15d ago against content hash 81458314e415, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

broken-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 15d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/checker.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.

skills/broken-link-checker/SKILL.md · 14 lines

What it actually says

Canonical NotFair workflow

Read ../../seo/broken-link-checker/WORKFLOW.md completely, then follow it as the active workflow. Resolve every relative reference from that file against ../../seo/broken-link-checker/.

Files

What ships with it

2 files 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.

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.

  1. 15d ago Changed · -45 lines 81458314e415
  2. 1mo ago Changed · -2 tokens per session 7d989df6bf24
  3. 1mo ago First seen · 59 lines · 72 tokens per session scan A 9a76d76e842b

Subscribe to this mod's changes

broken-link-checker is a skill published in the GitHub repository nowork-studio/notfair-plugin (4,059 stars, last pushed 2d ago), licensed MIT. It adds 70 tokens to every session and 159 once invoked, about $0.0003 per session on Opus 5.5. 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.

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