[reynaldi]

As someone not familiar with MCP, so the tool definition is just the request spec and resource definition is just the response?

Then I have the same question with the article, why do we need this standard? If it's just to let the LLM know to call the tool in JSON format

[snthpy]

Nope. The tool definition is just the request spec. Actually response spec was added but in June only. Who knows what resources are for, not very clear tbh.