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One thing about MCP that some people forget is that the models are post trained on MCP-based rollouts. I think people imagine that MCP was something people discovered about models but it’s deeper than that — models are explicitly trained to be able to interpret various and unseen kinds of MCP system prompts.

The exact same is true of these Claude Skills. Technically this is “just a system prompt and some tools”, but it’s actually about LLM labs intentionally encoding specific frameworks of action into the models.



A source I trust told me that Anthropic's models haven't yet been deliberately trained to know about skills.




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