Expand description
The event name a legacy-transport frame carries, or the unnamed default.
The two names the 2024-11-05 HTTP+SSE transport defines, kept as
constants so no call site spells them as a literal. The specification
names them in prose — “the server MUST send an endpoint event” and
“server messages are sent as SSE message events” — and a literal at a
call site is how one of them ends up spelled Endpoint and silently
matches nothing.
Cited: https://modelcontextprotocol.io/specification/2024-11-05/basic/transports