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There are several cases where this is not possible or desirable:

- you are using AI as an E2E testing tool and it's a requirement to not just test the API but also the workings of the UI

- you are using some third party tool and want to automate its usage

To the first point, why use AI for end-to-end testing at all? The main app I work on has accessible buttons, menus, etc, that can all be found deterministically, why waste the money having AI try to figure it out and possibly lie about the results?

The writing was on the wall with the MCP->CLI jump. The promise to investors is that you're replacing people. People don't make API calls.

You are because that requires you to expose that API for every single piece of software ever