---
title: ToolRouter — Use Case
description: Step-by-step guide for a real-world ToolRouter use case with agent-specific instructions.
url: https://toolrouter.com/tools/site-crawler/use-cases/find-404-errors
---
# Find 404 Errors Across Your Site

Every 404 error on your site is a dead end -- for users who hit a wall, for search engine crawlers who waste budget, and for link equity that evaporates instead of flowing to your content. Worse, you often do not know these errors exist because they only appear when following specific link paths.

ToolRouter's crawl_site skill follows every internal link on your site and records the HTTP status code of each destination. Pages returning 404 are flagged along with every source page that links to them. This gives you a complete map of broken links, not just individual pages.

Regular 404 audits are critical after content deletions, URL restructures, CMS migrations, and any deployment that changes routing. The longer 404 errors persist, the more damage they do to user experience and search rankings.

**Tool:** [Site Crawler](https://toolrouter.com/tools/site-crawler)
**Skills:** crawl_site

## Agent Guides

- [How to Find 404 Errors with Claude](https://toolrouter.com/tools/site-crawler/use-cases/find-404-errors/claude): Guide for Claude
- [How to Find 404 Errors with ChatGPT](https://toolrouter.com/tools/site-crawler/use-cases/find-404-errors/chatgpt): Guide for ChatGPT
- [How to Find 404 Errors with Copilot](https://toolrouter.com/tools/site-crawler/use-cases/find-404-errors/copilot): Guide for Copilot
- [How to Find 404 Errors with OpenClaw](https://toolrouter.com/tools/site-crawler/use-cases/find-404-errors/openclaw): Guide for OpenClaw
