The biggest advantage of this is for the llm providers like OAI not application developers.

LLM's are brains with no tools (no hands, legs, etc).

When we use tool calling we use them to empower the brain. But using normal API's the language model providers like OpenAI have no access to those tools.

With MCP they do. The brain they create can now have access to a lot of tools that the community builds directly _from_ llm, not through the apps.

This is here to make ChatGPT/Claude/etc _the gateway_ to AI rather than them just being API providers for other apps.