I think so, but if you wanted to be pedantic you could make the argument that the same resource is not being served with the different Accept header. A welcome page is not the same thing as the JSON returned from the MCP spec.

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pull_my_finger 4 hours ago | parent [-]

Maybe it should return a 303 See Other response

	▲	weird-eye-issue 2 hours ago \| parent [-]
		A redirect actually does make sense but then there will be some percentage of users that end up copying the redirect URL and try to use that as the MCP URL