---
title: "lychee Async Broken Link Checker for Websites and Documentation"
description: "lychee is a fast, async, stream-based link checker written in Rust that finds broken URLs and mail addresses inside Markdown, HTML, reStructuredText, websites and more. It supports HTTP/HTTPS, file links, and mail address validation with configurable concurrency and output formats."
verification: "security_reviewed"
source: "https://github.com/lycheeverse/lychee"
category:
  - "Content Writing & SEO"
framework:
  - "Custom Agents"
tool_ecosystem:
  github_repo: "lycheeverse/lychee"
  github_stars: 3463
---

# lychee Async Broken Link Checker for Websites and Documentation

lychee is a fast, async, stream-based link checker written in Rust that finds broken URLs and mail addresses inside Markdown, HTML, reStructuredText, websites and more. It supports HTTP/HTTPS, file links, and mail address validation with configurable concurrency and output formats.

## Installation

Choose whichever fits your setup:

1. Copy this skill folder into your local skills directory.
2. Clone the repo and symlink or copy the skill into your agent workspace.
3. Add the repo as a git submodule if you manage shared skills centrally.
4. Install it through your internal provisioning or packaging workflow.
5. Download the folder directly from GitHub and place it in your skills collection.

## Source

- [Agent Skill Exchange](https://agentskillexchange.com/skills/lychee-async-broken-link-checker/)