Right we can quibble about the wire protocol but the point remains that the arbitrary REPL becomes suboptimal as a solution when there’s not a deterministic endpoint. So ‘scripting’ is not really what we are looking for; we just want the final data output and scripting is fine when it’s a one off
They’re not the same thing under a different wire protocol!
An MCP tool call that returns the top N spenders puts the result in the agent’s context window.
A CLI tool call on the other hand… The agent can pipe their results into other completely unrelated CLI tools. It can write a loop that calls multiple tools.
These things are not possible with MCP but are trivial with CLIs.
Anthropic proposed a way to programmatically chain MCPs together a while back, I'm not sure if it's been implemented much yet: https://www.anthropic.com/engineering/code-execution-with-mc...
I don't even need to read that to know they're re-inventing PowerShell now.
Edit: I read it. Yep.
We have text interfaces refined by humans for decades and there's an endless sea of training data for them, but they imagine these amateur-hour homegrown solutions will ever outdo an agent with shell access?