MCP notifications

Tag 17: the server relays the container’s subscription to the notifications of the client’s servers; the client answers with one channel response per notification, an error last, and the channel response finish, each relayed to the container.

The server opens this channel when the container’s proxy sends a notifications ask on /requests. Every channel response is relayed to the container as one message.

• The request. The tag byte 17 and nothing more. Request states its form.
• The response. One channel response per notification, an error last when the client sends one, and the channel response finish. Response states the sequence.
• The conduit. The server relays each channel response to the proxy’s /mcp/notifications/{channel} as one message, in order, and closes that connection when the channel finishes. A client connection that ends leaves the proxy’s connection unclosed.