C

each ai need context management per conversation this is something that would be very clunky to replicate on top of http or ftp (as in requiring side channel information due session and conversation management)

Everyone looks at api and sure mcp seem redundant there but look at agent driving a browser the get dom method depends on all the action performed from when the window opened and it needs to be per agent per conversation

Can you do that as rest sure sneak a session and conversation in a parameter or cookie but then the protocol is not really just http is it it's all this clunky coupling that comes with a side of unknowns like when is a conversation finished did the client terminate or were just between messages and as you go and solve these for the hundredth time you'd start itching for standardization