Configuration schema for URL-based MCP connections.
Streamable HTTP is used by default. Set transport: "sse" only for a
legacy server that exposes a direct SSE endpoint. The mode discriminator
controls MCP protocol negotiation independently of the transport.
HTTPConnectionSchema: ZodUnion<
readonly [ZodPipe<ZodDiscriminatedUnion<[ZodObject<__type, strict>, ZodObject<__type, strict>], "mode">, ZodTransform<__type