# 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.

- Skill: `agentskillexchange/lychee-async-broken-link-checker-for-websites-and-documentat` (Agent Skill)
- Install (CLI): `npx skillmds@latest add agentskillexchange/lychee-async-broken-link-checker-for-websites-and-documentat`
- Raw SKILL.md: https://api.skillmd.com/api/skills/agentskillexchange/lychee-async-broken-link-checker-for-websites-and-documentat/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Web & Frontend
- Author: agentskillexchange (https://skillmd.com/u/agentskillexchange)
- Updated: 2026-09-08
- Page: https://skillmd.com/skills/agentskillexchange/lychee-async-broken-link-checker-for-websites-and-documentat

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# 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

Use the upstream install or setup path that matches your environment:
- brew install lychee
- docker pull lycheeverse/lychee
- conda install lychee -c conda-forge
- cargo install lychee

Requirements and caveats from upstream:
- [![Docker Pulls](https://img.shields.io/docker/pulls/lycheeverse/lychee?color=%23099cec&logo=Docker)](https://hub.docker.com/r/lycheeverse/lychee)
- ### Docker
- | Language | Rust | Ruby | Go | JS | TypeScript | Python | JS | PHP |

Basic usage or getting-started notes:
- <!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
- [Commandline usage](#commandline-usage)
- [Library usage](#library-usage)

- Source: https://github.com/lycheeverse/lychee
- Extracted from upstream docs: https://raw.githubusercontent.com/lycheeverse/lychee/HEAD/README.md

## Source

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