Frédéric Barthelet explains how MCP apps display interactive interfaces in conversational hosts and why embedding third-party content raises isolation and content security policyA content security policy gives a browser rules limiting which resources a web document may load and some operations it may perform. AI app hosts can use it as one layer of protection for embedded interfaces. concerns.
He compares source-document and source-URL iframe approaches, then describes nesting an application view inside an iframe on a separate domain and using subdomains to separate app storage. He explains why developers must declare the external domains their apps require.
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