fix closing tab, remove 0/0 from credential modal

core/frontend/src/components/CredentialsModal.tsx

@@ -248,7 +248,9 @@ export default function CredentialsModal({
               {allRequiredMet ? (
                 <>
                   <Shield className="w-3.5 h-3.5" />
-                  All required credentials connected ({connectedCount}/{rows.length} total)
+                  {rows.length === 0
+                    ? "No required credentials!"
+                    : `All required credentials connected (${connectedCount}/${rows.length} total)`}
                 </>
               ) : (
                 <>

core/frontend/src/components/TopBar.tsx

@@ -2,6 +2,7 @@ import { useState, useCallback } from "react";
 import { useNavigate } from "react-router-dom";
 import { Crown, X } from "lucide-react";
 import { loadPersistedTabs, savePersistedTabs, TAB_STORAGE_KEY, type PersistedTabState } from "@/lib/tab-persistence";
+import { sessionsApi } from "@/api/sessions";
 
 export interface TopBarTab {
   agentType: string;
@@ -50,6 +51,14 @@ export default function TopBar({ tabs: tabsProp, onTabClick, onCloseTab, canClos
       onCloseTab(agentType);
       return;
     }
+    // Kill the backend session (queen/judge/worker) even outside workspace
+    sessionsApi.list()
+      .then(({ sessions }) => {
+        const match = sessions.find(s => s.agent_path === agentType);
+        if (match) return sessionsApi.stop(match.session_id);
+      })
+      .catch(() => {});  // fire-and-forget
+
     // Fallback: update localStorage directly (non-workspace pages)
     setPersisted(prev => {
       if (!prev) return null;

core/frontend/src/pages/workspace.tsx

@@ -358,6 +358,13 @@ export default function Workspace() {
   });
 
   const [activeWorker, setActiveWorker] = useState(initialAgent);
+
+  // Clear URL params after mount — they're consumed during initialization
+  // and leaving them causes confusion (stale ?agent= after tab switches, etc.)
+  useEffect(() => {
+    navigate("/workspace", { replace: true });
+  }, []);
+
   const [credentialsOpen, setCredentialsOpen] = useState(false);
   const [selectedNode, setSelectedNode] = useState<GraphNode | null>(null);
   const [newTabOpen, setNewTabOpen] = useState(false);
@@ -473,10 +480,6 @@ export default function Workspace() {
               ...s, messages: [...s.messages, userMsg],
             })),
           }));
-          // Clean prompt from URL to prevent re-send on refresh
-          const params = new URLSearchParams(searchParams);
-          params.delete("prompt");
-          navigate(`/workspace?${params.toString()}`, { replace: true });
         }
 
         updateAgentState(agentType, {
@@ -623,7 +626,7 @@ export default function Workspace() {
     } finally {
       loadingRef.current.delete(agentType);
     }
-  }, [updateAgentState, initialPrompt, searchParams, navigate]);
+  }, [updateAgentState, initialPrompt]);
 
   // Auto-load agents when new tabs appear in sessionsByAgent
   useEffect(() => {
@@ -1279,7 +1282,6 @@ export default function Workspace() {
     // Pause worker execution if running (saves checkpoint), then kill the
     // entire backend session so the queen and judge don't keep running.
     const state = agentStates[agentType];
-    console.log('[closeAgentTab]', agentType, 'sessionId:', state?.sessionId, 'state:', state);
     if (state?.sessionId) {
       const pausePromise = (state.currentExecutionId && state.workerRunState === "running")
         ? executionApi.pause(state.sessionId, state.currentExecutionId)