Comment by EMM_386

LLMs also don't know about new MCP tools when they are training but they use them perfectly fine when presented with the information about them.

AI software development models and agents can be "taught" to go look at the official version documentation for languages via the prompt (just as one example) without needing to modify their weights.

One call to getSpecification('Python','3.14') or some similar tool call and they know exactly what they are working with, even if the language version did not exist when the model was trained.