Add MCP extension configuration settings to host.json (SchemaStore#5276)

* Add MCP extension configuration settings to host.json

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* Add MCP configuration details to host.v2.json

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: shibayan

src/schemas/json/host.json

@@ -450,6 +450,54 @@
       },
       "additionalProperties": false
     },
+    "mcp-extension": {
+      "type": "object",
+      "description": "Configuration settings for 'mcp' triggers.",
+      "properties": {
+        "instructions": {
+          "description": "Describes to clients how to access the remote MCP server.",
+          "type": "string"
+        },
+        "serverName": {
+          "description": "A friendly name for the remote MCP server.",
+          "type": "string"
+        },
+        "serverVersion": {
+          "description": "Current version of the remote MCP server.",
+          "type": "string"
+        },
+        "encryptClientState": {
+          "description": "Determines if client state is encrypted. Defaults to true. Setting to false may be useful for debugging and test scenarios but isn't recommended for production.",
+          "type": "boolean",
+          "default": true
+        },
+        "messageOptions": {
+          "description": "COptions object for the message endpoint in the SSE transport.",
+          "type": "object",
+          "properties": {
+            "useAbsoluteUriForEndpoint": {
+              "description": "If set to false, the message endpoint is provided as a relative URI during initial connections over the SSE transport. If set to true, the message endpoint is returned as an absolute URI. Using a relative URI isn't recommended unless you have a specific reason to do so.",
+              "type": "boolean",
+              "default": false
+            }
+          },
+          "additionalProperties": false
+        },
+        "system": {
+          "description": "COptions object for the message endpoint in the SSE transport.",
+          "type": "object",
+          "properties": {
+            "webhookAuthorizationLevel": {
+              "description": "Defines the authorization level required for the webhook endpoint. Defaults to \"System\". Allowed values are \"System\" and \"Anonymous\". When you set the value to \"Anonymous\", an access key is no longer required for requests.",
+              "enum": ["System", "Anonymous"],
+              "default": "System"
+            }
+          },
+          "additionalProperties": false
+        }
+      },
+      "additionalProperties": false
+    },
     "version-1": {
       "type": "object",
       "properties": {
@@ -1480,6 +1528,9 @@
                 }
               },
               "additionalProperties": false
+            },
+            "mcp": {
+              "$ref": "#/definitions/mcp-extension"
             }
           },
           "additionalProperties": false

src/test/host/host.v2.json

@@ -91,6 +91,18 @@
       "maxOutstandingRequests": 200,
       "routePrefix": "api"
     },
+    "mcp": {
+      "encryptClientState": true,
+      "instructions": "Some test instructions on how to use the server",
+      "messageOptions": {
+        "useAbsoluteUriForEndpoint": false
+      },
+      "serverName": "TestServer",
+      "serverVersion": "2.0.0",
+      "system": {
+        "webhookAuthorizationLevel": "System"
+      }
+    },
     "queues": {
       "batchSize": 16,
       "maxDequeueCount": 5,