cchistory: Tracking Claude Code System Prompt and Tool Changes

Exploring how to track and analyze changes in Claude Code's system prompts and tools to understand AI assistant evolution

cchistory: Tracking Claude Code System Prompt and Tool Changes 2025-08-03 I did a hax Table of contents Hacking Claude: claude-trace Haiku this, Haiku that Hacking Claude Again: cchistory Findings from the Diff Mines User Message Changes System Prompt Changes Tools Changes Wrapping Up Today I got nerd sniped by Thomas . He suggested someone (wink wink) should collect the system prompts of various Claude Code versions and maybe show diffs. Naturally, I couldn't stop thinking about that for a while and decided to just implement it. I've been using Claude Code for a couple of months now and have

saved by

• Varun Goyal

related reading

• Best practices for Claude Code - Claude Code Docsanthropic.com
• Claude Code Cheat Sheetcc.storyfox.cz
• A Guide to Claude Code 2.0 and getting better at using coding agents – sankalp's blogsankalp.bearblog.dev
• How I Use Claude Code | Philipp Spiessspiess.dev
• GitHub - x1xhlol/system-prompts-and-models-of-ai-tools: FULL Augment Code, Claude Code, Cluely, CodeBuddy, Comet, Cursor, Devin AI, Junie, Kiro, Leap.new, Lovable, Manus, NotionAI, Orchids.app, Perplexity, Poke, Qoder, Replit, Same.dev, Trae, Traycer AI, VSCode Agent, Warp.dev, Windsurf, Xcode, Z.ai Code, Dia & v0. (And other Open Sourced) System Prompts, Internal Tools & AI Modelsgithub.com
• Claude Code Hit Escape Velocity in January. So I Used Claude Code to /Catch-Up.zerotopete.com
• Using CLAUDE.MD files: Customizing Claude Code for your codebase | Claudeclaude.com
• Using CLAUDE.MD files: Customizing Claude Code for your codebase | Claudeclaude.com
• Agentationagentation.dev
• How Anthropic teams use Claude Code | Claudeanthropic.com
• The Making of Claude Code \ Anthropicanthropic.com
• Prompting best practicesdocs.anthropic.com