Update MCP Server Template to adhere to 2025-09-29 server.json schema (#6888)

* Update to latest schema

* Fix test files

Author: joelverhagen

src/ProjectTemplates/Microsoft.Extensions.AI.Templates/src/McpServer/McpServer-CSharp/.mcp/server.json

@@ -1,18 +1,18 @@
 {
-  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-07-09/server.schema.json",
+  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-09-29/server.schema.json",
   "description": "<your description here>",
   "name": "io.github.<your GitHub username here>/<your repo name>",
   "version": "0.1.0-beta",
   "packages": [
     {
-      "registry_type": "nuget",
+      "registryType": "nuget",
       "identifier": "<your package ID here>",
       "version": "0.1.0-beta",
       "transport": {
         "type": "stdio"
       },
-      "package_arguments": [],
-      "environment_variables": []
+      "packageArguments": [],
+      "environmentVariables": []
     }
   ],
   "repository": {

test/ProjectTemplates/Microsoft.Extensions.AI.Templates.IntegrationTests/Snapshots/mcpserver.AotTrue.verified/mcpserver/.mcp/server.json

@@ -1,18 +1,18 @@
 {
-  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-07-09/server.schema.json",
+  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-09-29/server.schema.json",
   "description": "<your description here>",
   "name": "io.github.<your GitHub username here>/<your repo name>",
   "version": "0.1.0-beta",
   "packages": [
     {
-      "registry_type": "nuget",
+      "registryType": "nuget",
       "identifier": "<your package ID here>",
       "version": "0.1.0-beta",
       "transport": {
         "type": "stdio"
       },
-      "package_arguments": [],
-      "environment_variables": []
+      "packageArguments": [],
+      "environmentVariables": []
     }
   ],
   "repository": {

test/ProjectTemplates/Microsoft.Extensions.AI.Templates.IntegrationTests/Snapshots/mcpserver.Basic.verified/mcpserver/.mcp/server.json

@@ -1,18 +1,18 @@
 {
-  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-07-09/server.schema.json",
+  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-09-29/server.schema.json",
   "description": "<your description here>",
   "name": "io.github.<your GitHub username here>/<your repo name>",
   "version": "0.1.0-beta",
   "packages": [
     {
-      "registry_type": "nuget",
+      "registryType": "nuget",
       "identifier": "<your package ID here>",
       "version": "0.1.0-beta",
       "transport": {
         "type": "stdio"
       },
-      "package_arguments": [],
-      "environment_variables": []
+      "packageArguments": [],
+      "environmentVariables": []
     }
   ],
   "repository": {

test/ProjectTemplates/Microsoft.Extensions.AI.Templates.IntegrationTests/Snapshots/mcpserver.SelfContainedFalse.verified/mcpserver/.mcp/server.json

@@ -1,18 +1,18 @@
 {
-  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-07-09/server.schema.json",
+  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-09-29/server.schema.json",
   "description": "<your description here>",
   "name": "io.github.<your GitHub username here>/<your repo name>",
   "version": "0.1.0-beta",
   "packages": [
     {
-      "registry_type": "nuget",
+      "registryType": "nuget",
       "identifier": "<your package ID here>",
       "version": "0.1.0-beta",
       "transport": {
         "type": "stdio"
       },
-      "package_arguments": [],
-      "environment_variables": []
+      "packageArguments": [],
+      "environmentVariables": []
     }
   ],
   "repository": {

test/ProjectTemplates/Microsoft.Extensions.AI.Templates.IntegrationTests/Snapshots/mcpserver.net10.verified/mcpserver/.mcp/server.json

@@ -1,18 +1,18 @@
 {
-  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-07-09/server.schema.json",
+  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-09-29/server.schema.json",
   "description": "<your description here>",
   "name": "io.github.<your GitHub username here>/<your repo name>",
   "version": "0.1.0-beta",
   "packages": [
     {
-      "registry_type": "nuget",
+      "registryType": "nuget",
       "identifier": "<your package ID here>",
       "version": "0.1.0-beta",
       "transport": {
         "type": "stdio"
       },
-      "package_arguments": [],
-      "environment_variables": []
+      "packageArguments": [],
+      "environmentVariables": []
     }
   ],
   "repository": {