feat: ToolCallStatus partial_success/fallback_success visual states

- Add CornerDownRight, AlertCircle icons for fallback/partial states
- New isPartial/isFallback props on ToolCallRow with hint banners
- Read execution_log from thread.values in main.tsx, pass to ToolCallStatus
- Match by tc.name === entry.tool to determine partial/fallback per row

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

langgraph/src/components/ToolCallStatus.tsx

@@ -1,4 +1,4 @@
-import { Loader2, CheckCircle2, ChevronRight, ChevronDown, XCircle, ChevronsUpDown } from "lucide-react";
+import { Loader2, CheckCircle2, ChevronRight, ChevronDown, XCircle, ChevronsUpDown, AlertCircle, CornerDownRight } from "lucide-react";
 import { useState, useCallback } from "react";
 import { LoadExternalComponent } from "@langchain/langgraph-sdk/react-ui";
 
@@ -57,12 +57,15 @@ interface ToolCallStatusProps {
   uiItems?: UIMsgLocal[];
   stream?: Parameters<typeof LoadExternalComponent>[0]["stream"];
   components?: Parameters<typeof LoadExternalComponent>[0]["components"];
+  executionLog?: Array<{ tool: string; status: string; inputSummary?: string }>;
 }
 
 interface ToolCallRowProps {
   tc: ToolCall;
   isDone: boolean;
   isFailed: boolean;
+  isPartial?: boolean;
+  isFallback?: boolean;
   uiItem?: UIMsgLocal;
   stream?: ToolCallStatusProps["stream"];
   components?: ToolCallStatusProps["components"];
@@ -74,6 +77,8 @@ function ToolCallRow({
   tc,
   isDone,
   isFailed,
+  isPartial,
+  isFallback,
   uiItem,
   stream,
   components,
@@ -88,7 +93,33 @@ function ToolCallRow({
     }
   }, [globalExpanded]);
   const label = tc.name ? (TOOL_NAME_MAP[tc.name] ?? tc.name) : "工具调用";
-  const canExpand = isDone && (!!uiItem || isFailed);
+  const canExpand = isDone && (!!uiItem || isFailed || isPartial || isFallback);
+
+  // Determine icon and color by priority: isFailed > isFallback > isPartial > isDone > loading
+  function renderIcon() {
+    if (isFailed) return <XCircle className="size-3.5 text-red-500 shrink-0" />;
+    if (isFallback) return <CornerDownRight className="size-3.5 text-orange-500 shrink-0" />;
+    if (isPartial) return <AlertCircle className="size-3.5 text-yellow-500 shrink-0" />;
+    if (isDone) return <CheckCircle2 className="size-3.5 text-green-500 shrink-0" />;
+    return <Loader2 className="size-3.5 text-muted-foreground animate-spin shrink-0" />;
+  }
+
+  function renderLabel() {
+    if (isFailed) return `${label} · 失败`;
+    if (isFallback) {
+      if (canExpand) return `${label} · 已切换到备用 · ${expanded ? "收起" : "查看结果"}`;
+      return `${label} · 已切换到备用`;
+    }
+    if (isPartial) {
+      if (canExpand) return `${label} · 结果不完整 · ${expanded ? "收起" : "查看结果"}`;
+      return `${label} · 结果不完整`;
+    }
+    if (isDone) {
+      if (canExpand) return `${label} · ${expanded ? "收起" : "查看结果"}`;
+      return `${label} · 已完成`;
+    }
+    return tc.name ? (TOOL_LOADING_MAP[tc.name] ?? `正在${label}...`) : "思考中...";
+  }
 
   return (
     <div>
@@ -107,14 +138,8 @@ function ToolCallRow({
         ) : (
           <span className="size-3.5 shrink-0" />
         )}
-        {isFailed ? (
-          <XCircle className="size-3.5 text-red-500 shrink-0" />
-        ) : isDone ? (
-          <CheckCircle2 className="size-3.5 text-green-500 shrink-0" />
-        ) : (
-          <Loader2 className="size-3.5 animate-spin shrink-0" />
-        )}
-        <span>{isFailed ? `${label} · 失败` : isDone ? (canExpand ? `${label} · ${expanded ? "收起" : "查看结果"}` : `${label} · 已完成`) : (tc.name ? (TOOL_LOADING_MAP[tc.name] ?? `正在${label}...`) : "思考中...")}</span>
+        {renderIcon()}
+        <span>{renderLabel()}</span>
       </button>
       {expanded && isFailed && (
         <div className="mt-2 ml-7 rounded-md border border-red-200 bg-red-50 dark:bg-red-950/20 dark:border-red-900 px-3 py-2 animate-in fade-in duration-300">
@@ -123,6 +148,16 @@ function ToolCallRow({
           </p>
         </div>
       )}
+      {expanded && isPartial && !isFailed && (
+        <div className="mt-2 ml-7 bg-yellow-50 border border-yellow-200 rounded p-2 text-xs text-yellow-700 animate-in fade-in duration-300">
+          查询完成，但未找到完整匹配结果
+        </div>
+      )}
+      {expanded && isFallback && !isFailed && (
+        <div className="mt-2 ml-7 bg-orange-50 border border-orange-200 rounded p-2 text-xs text-orange-700 animate-in fade-in duration-300">
+          主工具执行失败，已自动切换至备选方案
+        </div>
+      )}
       {expanded && !isFailed && uiItem && stream && components && (
         <div className="mt-2 ml-7">
           <div className="animate-in fade-in duration-300">
@@ -134,7 +169,13 @@ function ToolCallRow({
           </div>
         </div>
       )}
-      {expanded && !isFailed && !uiItem && (
+      {expanded && !isFailed && !uiItem && (isPartial || isFallback) && (
+        <div className="mt-2 ml-7 space-y-2 animate-pulse">
+          <div className="h-3 bg-muted rounded w-3/4" />
+          <div className="h-3 bg-muted rounded w-1/2" />
+        </div>
+      )}
+      {expanded && !isFailed && !uiItem && !isPartial && !isFallback && (
         <div className="mt-2 ml-7 space-y-2 animate-pulse">
           <div className="h-3 bg-muted rounded w-3/4" />
           <div className="h-3 bg-muted rounded w-1/2" />
@@ -154,6 +195,7 @@ export default function ToolCallStatus({
   uiItems = [],
   stream,
   components,
+  executionLog = [],
 }: ToolCallStatusProps) {
   if (!toolCalls.length) return null;
 
@@ -210,12 +252,19 @@ export default function ToolCallStatus({
           uiItem = candidates[matchIdx];
         }
 
+        // Look up execution_log status by tool name
+        const logEntry = tc.name ? executionLog.find((e) => e.tool === tc.name) : undefined;
+        const isPartial = logEntry?.status === "partial_success";
+        const isFallbackStatus = logEntry?.status === "fallback_success";
+
         return (
           <ToolCallRow
             key={tc.id ?? i}
             tc={tc}
             isDone={!!isDone}
             isFailed={isFailed}
+            isPartial={isPartial}
+            isFallback={isFallbackStatus}
             uiItem={uiItem}
             stream={stream}
             components={components}

langgraph/src/main.tsx

@@ -426,6 +426,9 @@ function App() {
       .filter(Boolean),
   );
 
+  // ── Read execution_log for partial/fallback status ────────────────────────
+  const executionLog = ((thread.values as any)?.execution_log ?? []) as Array<{ tool: string; status: string; inputSummary?: string }>;
+
   // ── Find last AI message index ──────────────────────────────────────────
   const lastAiIdx = thread.messages.reduce((last, m, i) => (m.type === "ai" ? i : last), -1);
 
@@ -624,6 +627,7 @@ function App() {
                       uiItems={uiItems}
                       stream={thread}
                       components={ComponentMap as any}
+                      executionLog={executionLog}
                     />
                   )}