diff --git a/packages/webui/tests/w15-fixture.mjs b/packages/webui/tests/w15-fixture.mjs
index 84b6b044e..61fdb957f 100644
--- a/packages/webui/tests/w15-fixture.mjs
+++ b/packages/webui/tests/w15-fixture.mjs
@@ -45,7 +45,7 @@ export async function w15Fixture(t, { scenario = {}, slice = 'shell' } = {}) {
       if(/^\\/api\\/chat\\/threads\\/[^/]+\\/sessions$/.test(path)) return data({rows:[{id:ids.session,name:'Default',default:true}]});
       if(/^\\/api\\/chat\\/threads\\/[^/]+\\/messages(?:\\?.*)?$/.test(path)) return data({rows:[],after:null,hasMore:false});
       if(path==='/api/chat/threads' || /^\\/api\\/chat\\/threads\\?(shared=true|project=)/.test(path)) return data({rows:[{id:ids.thread,project:ids.project,name:'Project conversation',instance:'assistant'}]});
-      if(/^\\/api\\/bus\\/(inbox|messages|agents|tasks|queue|trail)(\\?|$)/.test(path)) return data({rows:[],unread:0});
+      if(/^\\/api\\/bus\\/(inbox|messages|agents|instances|tasks|queue|trail)(\\?|$)/.test(path)) return data({rows:[],unread:0});
       __unexpected.push(method+' '+path); return new Response(JSON.stringify({error:'fixture-unexpected-api'}),{status:403,headers:{'content-type':'application/json'}});
     };
   })();` });