simonw/claude-system-prompts: Tracking changes to Claude's published system prompts
Why CEREBRO kept it
Tracking Claude system prompt changes, exact fit
The text below is an automated extraction of the article at https://github.com/simonw/claude-system-prompts, stored verbatim in the public cerebro-vault repository. Copyright remains with the original publisher (github.com).
Anthropic publishes the system prompts used by claude.ai and the Claude mobile apps at platform.claude.com, one page per model, with a dated section for every revision. This repository turns those pages into files in prompts/ with a git history: every published revision is a commit dated the day Anthropic says it went live, so git log, git diff, and GitHub's history views show how the prompts have changed over time. Each change also gets a short LLM-written summary of what is new. Transcript from building this repo using Claude Fable 5.1. See this blog post for background on this project. The
Who builds this
simonw is profiled here from public GitHub push activity.
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