You didn't address my comment about state. If you're driving something like Playwright you need a way to maintain state between tool calls.

(Oddly enough I did solve that with my own CLI tool for running browsers during my "who needs MCP" phase, but it's a bit of a nasty hack that involves leaving files with PIDs lying around: https://github.com/simonw/rodney#directory-scoped-sessions and https://github.com/simonw/rodney/blob/a842432246f39775ccb14f...)