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> I did something a little bit hacky: if the request is for GET /mcp and the Accept header includes text/html and NOT application/json or text/event-stream, I return a HTML page

Is this not the intended use of request headers?

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Technically not really, it's supposed to be alternative versions of the same content.

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.

Maybe it should return a 303 See Other response

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

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