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).

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Piebald-AI/claude-code-system-prompts

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