it's not easier for agents to work with. it's easier for organizations to work with.

for agents, they're essentially the same thing - remote endpoints, and instructions on how to call those endpoints. what MCP brings is centralized updating and distribution of the instructions, and a promise that the skill and the REST api won't be out of sync with each other.

the one thing that skill.md+REST doesn't solve is how you get that skill.md to somebody else's computer, and how you ship an update to somebody else's computer once they've got a copy of the skill. if that's a problem you need to solve, you can either start inventing skill.md distribution protocols, or you can just use MCP.