Don't think its relevant who they are if they give advice that is based on outdated understanding of how agent harnesses are build and how to use MCP in an agent harness in the first place. You can serve agent skills via mcp or via text files accessed via local tools, if your harness makes this look different to the LLM in the end it is just a bad harness. The LLM should just see "ways to discover skills" and then "use the skills". If skills come from a folder or from an MCP is transparent implementation detail. This is more than just theoretical, if abstractions like the way skills are served leak into the context, this will measurably degrade agent performance, depending on model more or les severe!