Im confused what you mean here. Ive been workin gin the AI 20 years, not saying your wrong, just trying to understand what your saying...
MCP/skills are just any mechanism the LLM has to interact with the world. NER is the ability to classify one "thing" as another. "Jeff Freeman is a scientist" for example.
While NER is very important in NLP for sure,and yes we can fine-tune encoder-only llms to be better at NER I still am not grasping why your lumping fine-tunning + NER in with MCP, MCP is largely unrelated to NER and fine tuning, am I missing some context or something?