# Agent Instruction Drift Checker

Canonical URL: https://agent-instruction-drift-checker.vercel.app/

## What it is

Agent Instruction Drift Checker is a free, no-signup, browser-only utility for comparing AI coding instruction files such as AGENTS.md, CLAUDE.md, GEMINI.md, Cursor rules, Windsurf rules, and GitHub Copilot instructions.

The tool runs locally in the browser. Pasted instruction text is not uploaded. It checks for:

- command drift between canonical and tool-specific files
- missing canonical rules
- likely contradictions such as "do not use X" versus "use X"
- stale file reference hints when a file list is provided
- large instruction files that may bury high-signal rules
- a copyable Markdown drift report

## Useful URLs

- Tool: https://agent-instruction-drift-checker.vercel.app/
- Sitemap: https://agent-instruction-drift-checker.vercel.app/sitemap.xml
- Source: https://github.com/Turner-Levey/agent-instruction-drift-checker
- Tiny Tool Town listing: https://www.tinytooltown.com/tools/agent-instruction-drift-checker/
- No-Login pending listing: https://nologin.tools/tool/agent-instruction-drift-checker-vercel-app/
- No-Login pending-verification badge: https://nologin.tools/badge/agent-instruction-drift-checker-vercel-app/

## Positioning

Use this when a repository has more than one agent instruction file and the files may have drifted apart. It is separate from AGENTS.md Repo Readiness Checker, which scores a single AGENTS.md draft.