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Re:Diff of Claude Code system prompt over time by lukegil626 on Wednesday December 03, 2025 @11:16AM (#46136238)
I grabbed the basic system message sent by Claude Code for (basically) all versions since 0.2.9. It's in a Github PR-style viewer.

Scripts to grab it yourself here: https://github.com/lukegil/claude-code-prompts

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