Claude system prompts as a git timeline

Simon Willison converted Anthropic's publicly published Claude system prompts into a git repository with timestamped commits, making it possible to browse how Claude's instructions have changed across model versions using standard developer tools. This turns a flat documentation page into a searchable, diffable history of how Anthropic shapes its AI's behavior over time.

This story matters because it signals a shift in how AI agents are being adopted across the industry. For builders evaluating their AI stack, this is worth watching closely.

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