Documentation for MCP Apps does not match 2026-07-28 specification

[symdeb]

The specification and documents still refers to "initialize"

It does not describe out how to add the ui extension in the client request for capabilities _meta structure per client call for the 2026-07-28 specification

https://github.com/modelcontextprotocol/ext-apps/blob/main/specification/2026-01-26/apps.mdx

{
"method": "initialize",
"params": {
"protocolVersion": "2024-11-05",
"capabilities": {
"extensions": {
"io.modelcontextprotocol/ui": {
"mimeTypes": ["text/html;profile=mcp-app"]`