How to Answer
"This is why architecture matters:
- (1)MCP servers don't change — they're model-agnostic. All tool integrations survive.
- (2)Prompts need tuning — each model family responds differently to system prompts. Budget 1-2 weeks for prompt engineering.
- (3)Evaluation is the safety net — run the golden set on Gemini, compare scores vs Claude. Only migrate when quality parity is confirmed.
- (4)Agent loop is the same — tool_use/tool_result follows the same pattern across providers with minor field name changes. The lesson: decouple your intelligence layer from your integration layer. The model is a replaceable component."