Developer Builds Three-File Architecture to Swap LLMs in Claude Code Without Rewrites

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A developer frustrated by repeatedly rewriting lengthy CLAUDE.md configuration files when switching between AI models designed a three-layer system to simplify the process. The architecture splits configuration into three files: SOUL.md for identity and goals, INTERFACE.md for model-specific calibration, and BODY.md for model-agnostic process rules. Only INTERFACE.md needs to be changed when swapping between models such as DeepSeek V4 Pro, Claude Opus, or Gemini. The developer reports using the system across 200-plus sessions and five-plus projects with no identity or process drift across four LLM reconfigurations. The full configuration system has been released as open-source and is also available as a Claude Code skill.

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