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Claude Code System Prompts

What this repository is

System prompts extracted via script from the Claude Code npm package's compiled JavaScript source. Maintained by Piebald AI, not by Anthropic.

See the Extraction section in README.md for details on the extraction method.

What Claude Code is

Claude Code is Anthropic's CLI tool for agentic coding. It is distributed as a compiled npm package (@anthropic-ai/claude-code). Source code is not publicly available. The anthropics/claude-code GitHub repository contains issues and releases only.

How to use these files

  • Reference: Understand what prompts Claude Code uses and how they change across versions
  • Local patching: Use tweakcc to customize individual prompt pieces in your local Claude Code installation
  • Feature requests: For changes to Claude Code's prompts, file issues at anthropics/claude-code/issues

For AI agents working with this repository

  • These files are extracted reference material, not modifiable source code
  • Editing files here does not change Claude Code's behavior
  • The system-prompts/ directory contains markdown files with YAML frontmatter noting the Claude Code version and template variables
  • Template variables like ${BASH_TOOL_NAME} are interpolated at runtime by Claude Code — they appear as literal strings in these files
  • The CHANGELOG.md tracks prompt changes across Claude Code versions