fix: avoid completed cron tail pending state

webui/src/hooks/useNanobotStream.ts

@@ -8,6 +8,7 @@ import {
   normalizeToolProgressEvents,
   toolTraceLinesFromEvents,
 } from "@/lib/tool-traces";
+import { hasPendingAgentActivity } from "@/lib/activity-timeline";
 import type { StreamError } from "@/lib/nanobot-client";
 import type {
   InboundEvent,
@@ -450,12 +451,8 @@ export function useNanobotStream(
 } {
   const { client } = useClient();
   const [messages, setMessages] = useState<UIMessage[]>(initialMessages);
-  /** If the last loaded message is a trace row (e.g. "Using 2 tools"),
-   * the model was still processing when the page loaded — keep the
-   * loading spinner alive so the user sees the model is active. */
-  const initialStreaming = initialMessages.length > 0
-    ? initialMessages[initialMessages.length - 1].kind === "trace"
-    : false;
+  /** If history ends in unfinished agent activity, keep the loading spinner alive. */
+  const initialStreaming = hasPendingAgentActivity(initialMessages);
   const [isStreaming, setIsStreaming] = useState(initialStreaming || hasPendingToolCalls);
   /** Unix epoch seconds when the current user turn started; cleared on ``idle``. */
   const [runStartedAt, setRunStartedAt] = useState<number | null>(null);
@@ -694,9 +691,7 @@ export function useNanobotStream(
   useEffect(() => {
     setMessages(initialMessages);
     setIsStreaming(
-      (initialMessages.length > 0
-        ? initialMessages[initialMessages.length - 1].kind === "trace"
-        : false) || hasPendingToolCalls,
+      hasPendingAgentActivity(initialMessages) || hasPendingToolCalls,
     );
     setStreamError(null);
     setRunStartedAt(chatId ? client.getRunStartedAt(chatId) : null);

webui/src/hooks/useSessions.ts

@@ -8,6 +8,7 @@ import {
   fetchWebuiThread,
   listSessions,
 } from "@/lib/api";
+import { hasPendingAgentActivity } from "@/lib/activity-timeline";
 import { deriveTitle } from "@/lib/format";
 import type {
   ChatSummary,
@@ -29,6 +30,16 @@ function persistedMessagesToUi(messages: UIMessage[]): UIMessage[] {
   }));
 }
 
+function hasPendingToolCallsFromThread(
+  body: Awaited<ReturnType<typeof fetchWebuiThread>>,
+  messages: UIMessage[],
+): boolean {
+  if (typeof body?.has_pending_tool_calls === "boolean") {
+    return body.has_pending_tool_calls;
+  }
+  return hasPendingAgentActivity(messages);
+}
+
 /** Sidebar state: fetches the full session list and exposes create / delete actions. */
 export function useSessions(): {
   sessions: ChatSummary[];
@@ -257,8 +268,7 @@ export function useSessionHistory(key: string | null): {
           return;
         }
         const ui = persistedMessagesToUi(body.messages);
-        const last = ui[ui.length - 1];
-        const hasPending = last?.kind === "trace";
+        const hasPending = hasPendingToolCallsFromThread(body, ui);
         const forkBoundary = typeof body.fork_boundary_message_count === "number"
           ? Math.max(0, Math.min(body.fork_boundary_message_count, ui.length))
           : null;
@@ -342,13 +352,12 @@ export function useSessionHistory(key: string | null): {
           ? null
           : prev.forkBoundaryMessageCount + older.length;
         const nextMessages = [...older, ...prev.messages];
-        const last = nextMessages[nextMessages.length - 1];
         return {
           ...prev,
           messages: nextMessages,
           loadingOlder: false,
           error: null,
-          hasPendingToolCalls: last?.kind === "trace",
+          hasPendingToolCalls: hasPendingAgentActivity(nextMessages),
           forkBoundaryMessageCount: olderBoundary ?? shiftedBoundary,
           beforeCursor: body.page?.before_cursor ?? null,
           hasMoreBefore: body.page?.has_more_before === true,