---
title: "I Deleted Half My Claude Rules And It Got Smarter"
source_url: https://youtube.com/shorts/8dONvydqszc
captured_at: 2026-09-23
author: "Sebastian Hardy | AI Marketing"
contributor: "ชิดชนก"
platform: youtube
---
# I Deleted Half My Claude Rules And It Got Smarter

youtube video by **Sebastian Hardy | AI Marketing**, 0m50s, uploaded 2026-09-22. URL: https://youtube.com/shorts/8dONvydqszc
Tags: claude.md, claude.md best practices, claude.md file, claude.md setup, claude code, claude code tutorial, how to use claude code, claude code setup, claude code memory, claude code hooks, anthropic, claude ai, claude ai tutorial, ai coding, agentic coding

## Shared in LINE Note+
- 2026-09-23 13:45 by ชิดชนก

## Description
Anthropic removed over 80% of Claude Code's system prompt for Opus 5 and Fable 5 with no loss in quality. Here's why a long CLAUDE.md can slow Claude down, and how the /doctor command finds the rules you can cut. CLAUDE.md best practices for Claude Code, plus how Claude Code memory now saves your preferences automatically.

Get the cleanup checklist here: 

#Shorts #ClaudeCode #ClaudeAI