Soft 404 Fix — skill file for AI agents (AISkills402)

Overview

Finds which layer makes a page that does not exist answer 200 OK, the soft 404 that Search Console reports and site checks flag, and gives a fix that keeps every real route working plus the checks to run afterwards. Reads the report line or notice, the hosting name and the config or code that serves unknown paths - a catch-all rewrite to index.html on Netlify, Vercel, Firebase, Render or Cloudflare, an nginx fallback, an app route that sends the page shell, an error page set up as a redirect or given a new status, a Next.js notFound that comes after streaming has begun. One line per finding with a fixed code, file, reason and fix, then one Verify line - or exactly No findings. when unknown paths answer 404. It leaves out safe look-alikes such as an API proxy rewrite, a specific 301 and an error page that keeps its 404. Use when a site check or Search Console reports a soft 404, when a random URL answers 200, or before shipping a single-page app or an error-page config. One-time purchase of the SKILL.md file itself (Agent Skills format), not an API call: $0.01 USDC on Base over x402, yours forever incl. free re-downloads and new versions. No account, no API key. Tested with a strong and a weak model; the card tells you where the weak one fails: https://aiskills402.com/skills/soft-404-fix

Health