MCP server: Deployment experience server connection prompt

[lilyjma]

Ask summary

When customers run the Azure Functions: Deploy to Function app or Azure Functions: Deploy to Azure commands, detect whether the app is an MCP server, and if yes, add prompt after the "Select how to authenticate to MCP server" one (see issue):

Connect to remote server in current VSCode workspace post deployment

• Yes
• No

If selected Yes

When deployment completes, create (if needed) and open the mcp.json file with server registration information.

• If Built-in MCP authentication or Anonymous was chosen as the authentication approach, the configuration should be:

         "servers": {
                "remote-mcp-server": {
                    "url": "<depends on MCP server flavor>",
                    "type": "http"
                }
            }

• If Access key was chosen, the configuration should be:

  "servers": {
      "remote-mcp-server": {
          "type": "http",
          "url": "<depends on MCP server flavor>",
          "headers": {
              "x-functions-key": "${input:functions-key}"
          }
      }
  },
  "inputs": [
      {
          "type": "promptString",
          "id": "functions-key",
          "description": "Functions App Key",
          "password": true
      }
  ]

• DON'T run the server directly, but populate the url.
  • Self-hosted MCP server url: retrieve the app's root url and append /mcp
  • MCP extension server url: retrieve the app's root url and append /runtime/webhooks/mcp

If selected No

Do nothing.

Other requirements

• Show this prompt only if the server is not already registered in the mcp.json
• Don't show prompt again if customer has already answered prompt

E2E flow summary

1. Customers run the Azure Functions: Deploy to Function app or Azure Functions: Deploy to Azure
2. Select function app or Create new function app (existing prompt today)

If selects function app
3. Select how to authenticate to MCP server (new ask - see issue)
4. --> This ask: Connect to remote server in VSCode workspace
5. Pop up to confirm deployment (exists today)

If selects Create new function app
3. Enter app name (existing prompt)
4. Select location for new resources (existing prompt)
5. Select run time stack (existing prompt)
6. Select resource authentication type (existing prompt)
7. Select how to authenticate to MCP server (new ask - see issue)
8. --> This ask: Connect to remote server in VSCode workspace