cchistory

Extract and compare system prompts and tools from different Claude Code versions.

Prerequisites

• Claude Code must be installed locally
• You must be logged in to Claude Code
• Note: Each version tested will send a single -p "hey" request to Claude, which may incur costs if you're on a pay-per-token plan instead of Claude Max

Installation

npm install -g @mariozechner/cchistory

Usage

cchistory <version> [--latest]

Examples:

# Extract prompts from a single version
cchistory 1.0.0

# Extract prompts from version 1.0.0 to latest
cchistory 1.0.0 --latest

How it works

1. Downloads the specified Claude Code version from npm
2. Patches the version check to prevent auto-updates
3. Runs the patched version with claude-trace to intercept API requests
4. Sends a single test message (-p "hey") to trigger an API call
5. Extracts the system prompt, user message format, and available tools from the intercepted request
6. Saves the results to prompts-{version}.md

Existing prompt files are automatically skipped to avoid redundant downloads and API calls.

Output Format

Each prompts-{version}.md file contains: - User Message: The format of user messages sent to Claude - System Prompt: The system instructions Claude receives - Tools: Available tools with their descriptions and input schemas (excluding MCP tools)