add normalize mintype

Author: KazuCocoa

src/tests/mcp-apps.test.ts

@@ -53,6 +53,23 @@ describe('MCP Apps capability detection', () => {
     expect(supportsMcpAppsCapability(supportedCapabilities)).toBe(true);
   });
 
+  test.each([
+    ' text/html;profile=mcp-app ',
+    'text/html; profile=mcp-app',
+    'text/html; profile="mcp-app"',
+    'TEXT/HTML; PROFILE="MCP-APP"',
+  ])('normalizes the advertised MIME type %s', (mimeType) => {
+    const capabilities = {
+      extensions: {
+        [MCP_APPS_EXTENSION_ID]: {
+          mimeTypes: [mimeType],
+        },
+      },
+    };
+
+    expect(supportsMcpAppsCapability(capabilities)).toBe(true);
+  });
+
   test.each([
     undefined,
     {},

src/ui/mcp-apps.ts

@@ -27,7 +27,13 @@ export function supportsMcpAppsCapability(capabilities: unknown): boolean {
     return false;
   }
 
-  return uiCapability.mimeTypes.includes(MCP_APP_MIME_TYPE);
+  return uiCapability.mimeTypes.some((mimeType) => {
+    if (typeof mimeType !== 'string') {
+      return false;
+    }
+
+    return normalizeMimeType(mimeType) === MCP_APP_MIME_TYPE;
+  });
 }
 
 export function clientSupportsMcpApps(
@@ -47,3 +53,7 @@ export function clientSupportsMcpApps(
 function isRecord(value: unknown): value is Record<string, unknown> {
   return typeof value === 'object' && value !== null;
 }
+
+function normalizeMimeType(mimeType: string): string {
+  return mimeType.replace(/[\s"]/g, '').toLowerCase();
+}