Fix preview style can not get token in the hosted version

src/tools/create-token-tool/CreateTokenTool.ts

@@ -20,10 +20,6 @@ export class CreateTokenTool extends MapboxApiBasedTool<
     input: CreateTokenInput,
     accessToken?: string
   ): Promise<{ type: 'text'; text: string }> {
-    if (!accessToken) {
-      throw new Error('MAPBOX_ACCESS_TOKEN is not set');
-    }
-
     const username = MapboxApiBasedTool.getUserNameFromToken(accessToken);
 
     this.log(

src/tools/preview-style-tool/PreviewStyleTool.ts

@@ -17,9 +17,10 @@ export class PreviewStyleTool extends MapboxApiBasedTool<
   }
 
   protected async execute(
-    input: PreviewStyleInput
+    input: PreviewStyleInput,
+    accessToken?: string
   ): Promise<{ type: 'text'; text: string }> {
-    const username = MapboxApiBasedTool.getUserNameFromToken();
+    const username = MapboxApiBasedTool.getUserNameFromToken(accessToken);
 
     // Get list of tokens to find a public token
     const listTokensTool = new ListTokensTool();