Add ui/notifications/request-teardown notification for view-initiated termination (#215)

* Add ui/close-resource request for UI to initiate termination

* Add missing METHOD export

* Fix typo in remaining ui/request-close

* Align spec terminology to teardown/termination instead of close/clearnup

* Implement final comments

* Removing view behavior on initiation of request termination

src/generated/schema.json

@@ -4074,6 +4074,23 @@
       "required": ["mode"],
       "additionalProperties": {}
     },
+    "McpUiRequestTeardownNotification": {
+      "$schema": "https://json-schema.org/draft/2020-12/schema",
+      "type": "object",
+      "properties": {
+        "method": {
+          "type": "string",
+          "const": "ui/notifications/request-teardown"
+        },
+        "params": {
+          "type": "object",
+          "properties": {},
+          "additionalProperties": false
+        }
+      },
+      "required": ["method"],
+      "additionalProperties": false
+    },
     "McpUiResourceCsp": {
       "$schema": "https://json-schema.org/draft/2020-12/schema",
       "type": "object",

src/generated/schema.test.ts

@@ -91,6 +91,10 @@ export type McpUiSupportedContentBlockModalitiesSchemaInferredType = z.infer<
   typeof generated.McpUiSupportedContentBlockModalitiesSchema
 >;
 
+export type McpUiRequestTeardownNotificationSchemaInferredType = z.infer<
+  typeof generated.McpUiRequestTeardownNotificationSchema
+>;
+
 export type McpUiHostCapabilitiesSchemaInferredType = z.infer<
   typeof generated.McpUiHostCapabilitiesSchema
 >;
@@ -255,6 +259,12 @@ expectType<spec.McpUiSupportedContentBlockModalities>(
 expectType<McpUiSupportedContentBlockModalitiesSchemaInferredType>(
   {} as spec.McpUiSupportedContentBlockModalities,
 );
+expectType<spec.McpUiRequestTeardownNotification>(
+  {} as McpUiRequestTeardownNotificationSchemaInferredType,
+);
+expectType<McpUiRequestTeardownNotificationSchemaInferredType>(
+  {} as spec.McpUiRequestTeardownNotification,
+);
 expectType<spec.McpUiHostCapabilities>(
   {} as McpUiHostCapabilitiesSchemaInferredType,
 );

src/generated/schema.ts

@@ -478,6 +478,19 @@ export const McpUiSupportedContentBlockModalitiesSchema = z.object({
     .describe("Host supports structured content."),
 });
 
+/**
+ * @description Notification for app-initiated teardown request (View -> Host).
+ * Views send this to request that the host tear them down. The host decides
+ * whether to proceed - if approved, the host will send
+ * `ui/resource-teardown` to allow the view to perform cleanup before being
+ * unmounted.
+ * @see {@link app.App.requestTeardown} for the app method that sends this
+ */
+export const McpUiRequestTeardownNotificationSchema = z.object({
+  method: z.literal("ui/notifications/request-teardown"),
+  params: z.object({}).optional(),
+});
+
 /**
  * @description Capabilities supported by the host application.
  * @see {@link McpUiInitializeResult `McpUiInitializeResult`} for the initialization result that includes these capabilities