Agent Client Protocol (ACP)

The big question is why it can't be just a LSP server or extension to the LSP protocol to provide all that might be needed by the LLM.

Because there is no ai hype in LSP. AI is literally going through the same phase as early javascript libraries did. An explosion of tools, completely ignoring/bypassing previous accumulated knowledge, solving the wrong problems with the wrong tools.

And this will pile up the bloat stack, similar to js libraries, because new problems will rise from the wrong solutions, requiring even more wrong solutions to be incorporated in the stack.