additionalInterfaces

A list of additional supported interfaces (transport and URL combinations). This allows agents to expose multiple transports, potentially at different URLs.

Best practices:

• SHOULD include all supported transports for completeness

• SHOULD include an entry matching the main 'url' and 'preferredTransport'

• MAY reuse URLs if multiple transports are available at the same endpoint

• MUST accurately declare the transport available at each URL

Clients can select any interface from this list based on their transport capabilities and preferences. This enables transport negotiation and fallback scenarios.