diff --git a/src/components/ToolCard.vue b/src/components/ToolCard.vue
index ce03184..312120a 100644
--- a/src/components/ToolCard.vue
+++ b/src/components/ToolCard.vue
@@ -136,6 +136,7 @@ function shouldKeepOpen(tc: AiToolCallInfo): boolean {
 }
 
 function formatToolName(name: string): string {
+  if (!name) return ''
   return name.replace(/_/g, ' ').replace(/\b\w/g, c => c.toUpperCase())
 }
 
@@ -200,6 +201,7 @@ function parseResult(result: unknown): ToolResult | null {
 }
 
 function toolCategory(name: string): string {
+  if (!name) return 'default'
   if (name === 'read_file') return 'file-read'
   if (name === 'write_file') return 'file-write'
   if (name === 'list_directory') return 'dir'
@@ -223,14 +225,23 @@ function shortPath(p: string): string {
   return parts.length <= 2 ? p : '.../' + parts.slice(-2).join('/')
 }
 
-/** 格式化字节数 */
-function formatBytes(bytes: number | undefined): string {
-  if (!bytes) return '0 B'
+/** 格式化字节数(兜底:undefined/null/负/NaN/Infinity 统一降级为 '0 B',防渲染异常) */
+function formatBytes(bytes: number | undefined | null): string {
+  if (typeof bytes !== 'number' || !Number.isFinite(bytes) || bytes <= 0) return '0 B'
   if (bytes < 1024) return bytes + ' B'
   if (bytes < 1048576) return (bytes / 1024).toFixed(1) + ' KB'
   return (bytes / 1048576).toFixed(1) + ' MB'
 }
 
+/** 从工具 args(unknown)中安全取字符串字段;非对象/字段非 string 时返回空串 */
+function argString(args: unknown, key: string): string {
+  if (args && typeof args === 'object' && !Array.isArray(args)) {
+    const v = (args as Record<string, unknown>)[key]
+    return typeof v === 'string' ? v : ''
+  }
+  return ''
+}
+
 /** 通用工具结果格式化(非文件类工具) */
 function formatToolResult(tc: AiToolCallInfo): string {
   const r = parseResult(tc.result)
@@ -238,8 +249,11 @@ function formatToolResult(tc: AiToolCallInfo): string {
     // 非 JSON(纯文本:审批占位/错误/拒绝)→ 原样显示,审批占位时补拟执行参数避免空白
     const raw = typeof tc.result === 'string' ? tc.result : ''
     if (raw && tc.args && typeof tc.args === 'object') {
-      const a = tc.args as any
-      const detail = a.title || a.name || a.path || ''
+      const a = tc.args as Record<string, unknown>
+      const detail = typeof a.title === 'string' ? a.title
+        : typeof a.name === 'string' ? a.name
+        : typeof a.path === 'string' ? a.path
+        : ''
       if (detail) return `${raw}（${detail}）`
     }
     return raw
@@ -325,8 +339,7 @@ function displayArgValue(arg: { key: string; val: unknown }): string {
  * 解析项目名(复用 projectNameById,无则走 fallback),create_* 用固定文案。
  */
 function toolDisplayName(tc: AiToolCallInfo): string {
-  const args = tc.args as any
-  const p = args?.path as string | undefined
+  const p = argString(tc.args, 'path')
   switch (tc.name) {
     case 'read_file': return p ? `${t('aiTool.readPrefix')} ${shortPath(p)}` : t('aiTool.readFallback')
     case 'list_directory': return p ? `${t('aiTool.dirPrefix')} ${shortPath(p)}` : t('aiTool.dirFallback')
@@ -336,7 +349,7 @@ function toolDisplayName(tc: AiToolCallInfo): string {
     case 'purge_project':
     case 'update_project': {
       const idKey = PROJECT_ID_TOOL_ARG[tc.name]
-      const id = idKey ? (args?.[idKey] as string | undefined) : ''
+      const id = idKey ? argString(tc.args, idKey) : ''
       const name = id ? projectNameById.value[id] : ''
       const prefixKey = `${tc.name.replace('_project', '')}Prefix` as 'deletePrefix' | 'restorePrefix' | 'purgePrefix' | 'updatePrefix'
       const fallbackKey = `${tc.name.replace('_project', '')}Fallback` as 'deleteFallback' | 'restoreFallback' | 'purgeFallback' | 'updateFallback'
diff --git a/src/composables/ai/useAiConversations.ts b/src/composables/ai/useAiConversations.ts
index a727bea..538362c 100644
--- a/src/composables/ai/useAiConversations.ts
+++ b/src/composables/ai/useAiConversations.ts
@@ -74,15 +74,27 @@ export async function switchConversation(id: string) {
         content: m.content || '',
         model: m.model,
         timestamp: Date.now(),
-        toolCalls: m.tool_calls?.map((tc: any) => ({
-          id: tc.id,
-          name: tc.function?.name || '',
-          args: typeof tc.function?.arguments === 'string'
-            ? JSON.parse(tc.function.arguments || '{}')
-            : tc.function?.arguments || {},
-          status: 'completed' as const,
-          result: toolResultMap.get(tc.id),
-        })),
+        toolCalls: m.tool_calls?.map((tc: any): AiToolCallInfo => {
+          // 逐条容错:单条坏 arguments 仅降级为空对象,不影响整条对话回填
+          let args: unknown = {}
+          const rawArgs = tc.function?.arguments
+          if (typeof rawArgs === 'string') {
+            try {
+              args = rawArgs ? JSON.parse(rawArgs) : {}
+            } catch {
+              args = {}
+            }
+          } else if (rawArgs && typeof rawArgs === 'object') {
+            args = rawArgs
+          }
+          return {
+            id: tc.id,
+            name: tc.function?.name || '',
+            args,
+            status: 'completed' as const,
+            result: toolResultMap.get(tc.id),
+          }
+        }),
       }))
   } catch {
     state.messages = []
diff --git a/src/composables/ai/useAiEvents.ts b/src/composables/ai/useAiEvents.ts
index 91d298c..753eec4 100644
--- a/src/composables/ai/useAiEvents.ts
+++ b/src/composables/ai/useAiEvents.ts
@@ -127,6 +127,10 @@ export function handleEvent(event: AiChatEvent) {
       break
     }
 
+    case 'AiHeartbeat':
+      // 心跳事件:仅维持看门狗(已在上方 reset),无需额外处理;显式 case 防 switch 穿透
+      break
+
     case 'AiToolCallStarted': {
       const info: AiToolCallInfo = {
         id: event.id,
diff --git a/src/composables/ai/useAiSend.ts b/src/composables/ai/useAiSend.ts
index 6d3507f..55a6b7e 100644
--- a/src/composables/ai/useAiSend.ts
+++ b/src/composables/ai/useAiSend.ts
@@ -13,7 +13,7 @@ import { aiApi } from '../../api'
 import { useAppSettingsStore } from '../../stores/appSettings'
 import { state } from '../../stores/ai'
 import { resetStreamWatchdog, clearStreamWatchdog } from './useAiStream'
-import { startListener } from './useAiEvents'
+import { startListener, findToolCall } from './useAiEvents'
 import { nextMsgId } from './aiShared'
 
 const appSettings = useAppSettingsStore()
@@ -81,9 +81,8 @@ async function sendMessage(text: string, skill?: string) {
 /** 工具审批:乐观置 running,IPC 失败时改 completed+错误文案(不回滚避免卡按钮) */
 async function approveToolCall(toolCallId: string, approved: boolean) {
   // 乐观置运行中,禁用审批按钮防重复点击(后端事件回来后转 completed/rejected)
-  const tc = state.messages
-    .flatMap(m => m.toolCalls || [])
-    .find(t => t.id === toolCallId)
+  // 复用 findToolCall(反向扫描)避免重复实现查找逻辑
+  const tc = findToolCall(toolCallId)
   if (tc) tc.status = 'running'
   // 重启看门狗覆盖审批执行→续生成窗口(useAiEvents.ts:162 AiApprovalRequired 已 clear,
   // 审批态无心跳兜底;approve 后后端要跑工具+续生成,期间任何后端异常不回则按钮永久 running。
diff --git a/src/stores/project.ts b/src/stores/project.ts
index 065b8b6..f6f0342 100644
--- a/src/stores/project.ts
+++ b/src/stores/project.ts
@@ -248,16 +248,25 @@ function createStore() {
 
   /**
    * 发送审批响应。
-   * - 单选(select_type=single 或缺省):传 decision 单值,decisions 留空;
-   * - 多选(select_type=multiple):传 decisions 数组。
-   * F-260615-01: 新增 decisions/select_type 透传,与后端 IPC 签名对齐。
+   *
+   * 统一以 decisions 数组表达选择,按 pendingApproval.select_type 判定单/多选:
+   * - 单选(select_type='single' 或缺省):取 decisions[0] 作为后端 decision 单值;
+   * - 多选(select_type='multiple'):decisions 透传全量。
+   *
+   * 后端 IPC 需同时收 decision(单值,向后兼容)与 decisions(数组),此处按 select_type
+   * 自动分派,消除调用方"该传 decision 还是 decisions"的歧义。
+   * F-260615-01: decisions/select_type 透传,与后端 IPC 签名对齐。
    */
   async function approveHumanApproval(
-    decision: string,
+    decisions: string[],
     comment?: string,
-    decisions?: string[],
   ) {
     if (!state.pendingApproval) return
+    const selectType = state.pendingApproval.select_type ?? 'single'
+    // 单选取首项(后端 decision 为单值);多选 decision 取首项作占位(后端按 decisions 走)
+    const decision = selectType === 'multiple'
+      ? (decisions[0] ?? '')
+      : (decisions[0] ?? '')
 
     try {
       // 调用 IPC 命令发送审批响应
@@ -269,8 +278,8 @@ function createStore() {
         decision,
         comment,
         options: state.pendingApproval.options ?? [],
-        decisions: decisions ?? [],
-        select_type: state.pendingApproval.select_type ?? 'single', // B-260615-34:Tauri 2 IPC 不转 camelCase,须 snake_case 对齐后端 workflow.rs:211(同 invoke 其余字段 execution_id/node_id/decisions 均已 snake_case)
+        decisions,
+        select_type: selectType, // B-260615-34:Tauri 2 IPC 不转 camelCase,须 snake_case 对齐后端 workflow.rs:211
       })
 
       // 清除待审批状态
diff --git a/src/views/ProjectDetail.vue b/src/views/ProjectDetail.vue
index 1288cbb..96b7d6a 100644
--- a/src/views/ProjectDetail.vue
+++ b/src/views/ProjectDetail.vue
@@ -407,7 +407,7 @@ async function handleImportDir() {
 
 // ── 审批处理 ──
 async function handleApproval(decision: string) {
-  await store.approveHumanApproval(decision)
+  await store.approveHumanApproval([decision])
   showApprovalDialog.value = false
 }
 
@@ -417,8 +417,8 @@ const multiDecisions = ref<string[]>([])
 
 async function handleApprovalMulti() {
   if (multiDecisions.value.length === 0) return
-  // decision 传首项(向后兼容),decisions 透传全量
-  await store.approveHumanApproval(multiDecisions.value[0], undefined, [...multiDecisions.value])
+  // 统一传 decisions 数组,store 按 select_type 分派单/多选
+  await store.approveHumanApproval([...multiDecisions.value])
   multiDecisions.value = []
   showApprovalDialog.value = false
 }