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Can the MCP tell them how to use the CLI? Surely that would mean less time wasted on discovering it each time.

Going to try this with fastmail-cli and see what happens.

Yes, MCP instructions are a blob that is injected at the start of the context. That file is prefixed to the agent specific help[1] for the instructions (that is returned if --help is invoked with CLAUDE=1 or AGENT=1).

[1]: https://github.com/jcdickinson/ferrisfetch/blob/main/cmd/age...

Ah cool, that said: If your tool is primarily for Claude Desktop (or mobile if hosted), that surely needs the MCP to actually do anything right?

I'm not sure about Claude Desktop (it must surely have CLI access?), but I think your line of thinking is correct.

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