Sync eng/common directory with azure-sdk-tools for PR 11493 (#46268)

* Removed broken link from README

* Update README.md

* Update README.md

---------

Co-authored-by: vcolin7 <vicolina@microsoft.com>

Author: azure-sdk

eng/common/mcp/README.md

@@ -24,15 +24,13 @@ The script will install the latest version of the azsdk cli executable from [too
 
 Azure SDK MCP server code is in [azure-sdk-tools/tools/azsdk-cli/Azure.Sdk.Tools.Cli](https://github.com/Azure/azure-sdk-tools/tree/main/tools/azsdk-cli/Azure.Sdk.Tools.Cli).
 
-Azure SDK MCP servers should support [stdio and sse transports](https://modelcontextprotocol.io/docs/concepts/transports#server-sent-events-sse).
+Azure SDK MCP servers [**MUST** support stdio and **SHOULD** support streamable HTTP using latest OAuth 2.1 Best Current Practices (BCPs)](https://modelcontextprotocol.io/docs/concepts/transports).
 
-When running in copilot the default is stdio mode, but SSE is useful to support for external debugging.
+When running in copilot the default is stdio mode.
 
 ### Developing MCP servers in C#
 
 See the [C# MCP SDK](https://github.com/modelcontextprotocol/csharp-sdk)
 
-Add an [SSE transport](https://github.com/modelcontextprotocol/csharp-sdk/tree/main/samples/AspNetCoreSseServer)
-
 TODO: Add the azsdk-cli project to pull in MCP server dependencies from the repo