ClaudeMap

Claude Code System Prompts (Piebald)

Version-by-version teardown of Claude Code's system prompts and 27 built-in tool descriptions, updated with every release.

Prompt Librariessystem-promptclaude-codeanalysisprompt-engineering
Visit projectPiebald-AI/claude-code-system-prompts

Piebald's tracker dissects the actual system prompts shipped with each Claude Code release: the main loop prompt, all 27 built-in tool descriptions, and the subagent prompts. Each version gets a diff, so you can watch how Anthropic tunes instructions release over release — a first-class reference for prompt engineers and for anyone whose skills or hooks must survive prompt changes. Updated within minutes of every npm release (tracking v2.1.263 as of early September 2026).

What it does

  • 515 extracted system-prompt strings from Claude Code — expanded from 350 in June 2026, their most complete coverage yet
  • Updated within minutes of each Claude Code release, with a changelog and GitHub releases per version
  • Explains why there's no single 'system prompt': conditional sections, tool descriptions, per-agent prompts
  • Companion tool tweakcc can patch your local Claude Code install with modified prompts

When to use it

The reference for understanding what Claude Code actually tells its model — tool descriptions, agent prompts, utility prompts. Star it to get a release notification per Claude Code version.

Getting started

Browse or clone the repo; star it to get notified on each new release. To patch a local install, see the linked tweakcc project.

Things to know

Extracted material — reflects the version it was taken from; check the changelog for which Claude Code version the snapshot matches.

Repository

Piebald-AI/claude-code-system-prompts

Charted

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