Team CLI. I generally think we should build tools that are usable by humans and agents alike. An anti-pattern is having to use an agent to do something because you didn't build a human-accessible one. Another anti-pattern are MCP (Model Context Protocol) interfaces that are not managing any context.

That said, MCP could be an effective way to sandbox what an agent can do with a tool. Also, it seems plausible to me that a tool that actually provided information to a model via the MCP protocol could be more useful than a CLI tool which operates in the "silence means success" mode of most unix CLI tools.

Basically, make a design choice for _reasons_ and not just because you like that TLA of the option you picked.