diff --git a/app/apps/[id]/page.tsx b/app/apps/[id]/page.tsx
index 028179a..da4e3ef 100644
--- a/app/apps/[id]/page.tsx
+++ b/app/apps/[id]/page.tsx
@@ -37,6 +37,8 @@ import {
 import { Checkbox } from "@/components/ui/checkbox";
 import {
   ArrowLeft,
+  Braces,
+  Copy,
   Loader2,
   Plus,
   Send,
@@ -47,7 +49,8 @@ import {
   TrendingUp,
 } from "lucide-react";
 import { useRouter } from "next/navigation";
-import { useAppTools, useAppToolsStatistics } from "@/hooks/useAppTools";
+import { useAppTools, useAppToolsStatistics, type AppTool } from "@/hooks/useAppTools";
+import { Textarea } from "@/components/ui/textarea";
 import { useInvalidateAppSkillDiagnostics } from "@/hooks/useAppSkillDiagnostics";
 import AppSkillsSection from "../components/AppSkillsSection";
 import AppSkillDiagnostics from "../components/AppSkillDiagnostics";
@@ -124,6 +127,7 @@ export default function AppDetailPage({ params }: { params: Promise<{ id: string
   const [bindDialogOpen, setBindDialogOpen] = useState(false);
   const [unbindDialogOpen, setUnbindDialogOpen] = useState(false);
   const [selectedAppToolId, setSelectedAppToolId] = useState<number | null>(null);
+  const [editingTool, setEditingTool] = useState<AppTool | null>(null);
   const [rejectDialogOpen, setRejectDialogOpen] = useState(false);
   const [reviewActionPending, setReviewActionPending] = useState(false);
   const [reviewLogOpen, setReviewLogOpen] = useState(false);
@@ -132,6 +136,7 @@ export default function AppDetailPage({ params }: { params: Promise<{ id: string
     tools: appTools,
     loading: appToolsLoading,
     unbindTool,
+    updateAppTool,
     refresh: refreshAppTools,
   } = useAppTools(appId);
   const { statistics } = useAppToolsStatistics(appId);
@@ -512,7 +517,14 @@ export default function AppDetailPage({ params }: { params: Promise<{ id: string
                     <TableBody>
                       {appTools.map((tool) => (
                         <TableRow key={tool.id}>
-                          <TableCell className="font-medium">{tool.tool_display_name}</TableCell>
+                          <TableCell className="font-medium">
+                            {tool.tool_display_name}
+                            {Object.keys(tool.custom_config || {}).length > 0 && (
+                              <Badge variant="outline" className="ml-2 text-xs">
+                                {t("hasCustomConfig")}
+                              </Badge>
+                            )}
+                          </TableCell>
                           <TableCell>
                             <Badge
                               className={toolTypeClass(tool.tool_type)}
@@ -548,6 +560,14 @@ export default function AppDetailPage({ params }: { params: Promise<{ id: string
                             <div className="flex items-center justify-end gap-2">
                               {canEditThisApp && (
                                 <>
+                                  <Button
+                                    variant="ghost"
+                                    size="sm"
+                                    title={t("editToolConfig")}
+                                    onClick={() => setEditingTool(tool)}
+                                  >
+                                    <Braces className="h-4 w-4" />
+                                  </Button>
                                   <Button
                                     variant="ghost"
                                     size="sm"
@@ -618,6 +638,18 @@ export default function AppDetailPage({ params }: { params: Promise<{ id: string
           </AlertDialogFooter>
         </AlertDialogContent>
       </AlertDialog>
+
+      {/* 编辑工具自定义配置对话框 */}
+      {editingTool && (
+        <EditToolConfigDialog
+          tool={editingTool}
+          onClose={() => setEditingTool(null)}
+          onSave={async (customConfig) => {
+            const ok = await updateAppTool(editingTool.id, customConfig);
+            if (ok) setEditingTool(null);
+          }}
+        />
+      )}
     </div>
   );
 }
@@ -747,3 +779,121 @@ function BindToolsDialog({
     </Dialog>
   );
 }
+
+// 编辑工具自定义配置对话框。
+// custom_config 与 default_config 浅合并（顶层键覆盖）：改 headers 就要写整个
+// headers 对象，不是只写变化的那一项。密钥值用 ${ENV_VAR} 引用环境变量名，
+// 不要把 token 字面值贴进来——值属于部署环境的 .env。
+function EditToolConfigDialog({
+  tool,
+  onClose,
+  onSave,
+}: {
+  tool: AppTool;
+  onClose: () => void;
+  onSave: (customConfig: Record<string, any>) => Promise<unknown>;
+}) {
+  const t = useTranslations("apps");
+  const tc = useTranslations("common");
+  const [text, setText] = useState(() => JSON.stringify(tool.custom_config || {}, null, 2));
+  const [error, setError] = useState<string | null>(null);
+  const [saving, setSaving] = useState(false);
+
+  const handleSave = async () => {
+    let parsed: Record<string, any>;
+    try {
+      parsed = JSON.parse(text);
+    } catch (e: any) {
+      setError(`${t("invalidJson")}: ${e.message}`);
+      return;
+    }
+    if (typeof parsed !== "object" || parsed === null || Array.isArray(parsed)) {
+      setError(t("configMustBeObject"));
+      return;
+    }
+    setError(null);
+    setSaving(true);
+    await onSave(parsed);
+    setSaving(false);
+  };
+
+  return (
+    <Dialog open onOpenChange={(open) => !open && onClose()}>
+      <DialogContent className="max-w-2xl gap-4 max-h-[85vh] overflow-y-auto">
+        <DialogHeader>
+          <DialogTitle>
+            {t("editToolConfig")} · {tool.tool_display_name}
+          </DialogTitle>
+        </DialogHeader>
+
+        <div className="space-y-3">
+          <div className="text-sm text-muted-foreground">{t("customConfigMergeHint")}</div>
+
+          {Object.keys(tool.default_config || {}).length > 0 && (
+            <div>
+              <div className="text-xs font-medium text-muted-foreground mb-1 flex items-center gap-2">
+                <span>{t("toolDefaultConfig")}</span>
+                <Button
+                  variant="ghost"
+                  size="sm"
+                  className="h-6 px-2 text-xs"
+                  onClick={async () => {
+                    try {
+                      await navigator.clipboard.writeText(
+                        JSON.stringify(tool.default_config, null, 2)
+                      );
+                      toast.success(t("copiedToClipboard"));
+                    } catch {
+                      toast.error(tc("copyFailed"));
+                    }
+                  }}
+                >
+                  <Copy className="h-3 w-3 mr-1" />
+                  {t("copyDefaultConfig")}
+                </Button>
+              </div>
+              <pre className="bg-muted p-2 rounded text-xs overflow-x-auto max-h-40">
+                {JSON.stringify(tool.default_config, null, 2)}
+              </pre>
+            </div>
+          )}
+
+            <div>
+              <div className="text-xs font-medium text-muted-foreground mb-1 flex items-center gap-2">
+                <span>{t("customConfigJson")}</span>
+                <Button
+                  variant="ghost"
+                  size="sm"
+                  className="h-6 px-2 text-xs"
+                  onClick={() => {
+                    setText("{}");
+                    setError(null);
+                  }}
+                >
+                  {t("resetToDefaultConfig")}
+                </Button>
+              </div>
+            <Textarea
+              value={text}
+              onChange={(e) => setText(e.target.value)}
+              className="font-mono text-xs resize-y"
+              style={{ minHeight: 240 }}
+              spellCheck={false}
+            />
+            {error && <div className="text-xs text-destructive mt-1">{error}</div>}
+          </div>
+        </div>
+
+        <DialogFooter>
+          <Button variant="outline" onClick={onClose} disabled={saving}>
+            {tc("cancel")}
+          </Button>
+          <Button onClick={handleSave} disabled={saving}>
+            {saving && <Loader2 className="h-4 w-4 mr-2 animate-spin" />}
+            {tc("save")}
+          </Button>
+        </DialogFooter>
+      </DialogContent>
+    </Dialog>
+  );
+}
diff --git a/hooks/useAppTools.ts b/hooks/useAppTools.ts
index 07ab564..5d229cf 100644
--- a/hooks/useAppTools.ts
+++ b/hooks/useAppTools.ts
@@ -100,6 +100,29 @@ export const useAppTools = (appId: number | null, isEnabled?: boolean) => {
     }
   };
 
+  // 更新应用的工具配置（custom_config 覆盖 default_config，浅合并）
+  const updateAppTool = async (
+    appToolId: number,
+    customConfig?: Record<string, any>,
+    priority?: number
+  ) => {
+    if (!appId) return false;
+
+    try {
+      await axios.put(`/api/apps/${appId}/tools/${appToolId}`, {
+        custom_config: customConfig ?? {},
+        ...(priority !== undefined ? { priority } : {}),
+      });
+      toast.success("工具配置已更新");
+      mutate();
+      return true;
+    } catch (error: any) {
+      console.error("Update app tool error:", error);
+      toast.error(error.response?.data?.error || error.response?.data?.detail || "更新工具配置失败");
+      return false;
+    }
+  };
+
   // 解绑工具
   const unbindTool = async (appToolId: number) => {
     if (!appId) return false;
@@ -125,6 +148,7 @@ export const useAppTools = (appId: number | null, isEnabled?: boolean) => {
     error,
     bindTool,
     batchBindTools,
+    updateAppTool,
     unbindTool,
     refresh: mutate,
   };
diff --git a/messages/en/apps.json b/messages/en/apps.json
index 3e642d2..f64cb3c 100644
--- a/messages/en/apps.json
+++ b/messages/en/apps.json
@@ -164,6 +164,16 @@
   "confirmUnbindTool": "Confirm Unbind Tool",
   "unbindToolWarning": "Are you sure you want to unbind this tool? After unbinding, this digital employee will not be able to use this tool.",
   "unbind": "Unbind",
+  "editToolConfig": "Edit Tool Config",
+  "hasCustomConfig": "Custom",
+  "customConfigMergeHint": "Top-level keys in custom config override the tool's default config: e.g. overriding headers requires the complete headers object. Secrets can be entered directly, or reference an environment variable via $'{ENV_VAR}'.",
+  "toolDefaultConfig": "Default config (read-only)",
+  "copyDefaultConfig": "Copy",
+  "copiedToClipboard": "Copied to clipboard",
+  "customConfigJson": "Custom config (JSON; empty $'{}' means using default config)",
+  "resetToDefaultConfig": "Clear & use default config",
+  "configMustBeObject": "Config must be a JSON object ($'{...}'), not an array or scalar",
+  "invalidJson": "Invalid JSON",
   "allToolsBound": "All available tools have been bound",
   "bind": "Bind",
   "bindCount": "Bind ({count})",
diff --git a/messages/zh-CN/apps.json b/messages/zh-CN/apps.json
index 15dc3ab..13fb151 100644
--- a/messages/zh-CN/apps.json
+++ b/messages/zh-CN/apps.json
@@ -164,6 +164,16 @@
   "confirmUnbindTool": "确认解绑工具",
   "unbindToolWarning": "确定要解绑该工具吗？解绑后，该数字员工将无法使用此工具。",
   "unbind": "解绑",
+  "editToolConfig": "编辑工具配置",
+  "hasCustomConfig": "自定义",
+  "customConfigMergeHint": "自定义配置的顶层键会覆盖工具默认配置：例如覆盖 headers 就要写完整的 headers 对象。密钥值可以直接填写，也可以写 $'{ENV_VAR}' 引用环境变量。",
+  "toolDefaultConfig": "默认配置（只读）",
+  "copyDefaultConfig": "复制",
+  "copiedToClipboard": "已复制到剪贴板",
+  "customConfigJson": "自定义配置（JSON，留空 $'{}' 表示使用默认配置）",
+  "resetToDefaultConfig": "清空，恢复用默认配置",
+  "configMustBeObject": "配置必须是一个 JSON 对象（$'{...}'），不能是数组或标量",
+  "invalidJson": "JSON 格式错误",
   "allToolsBound": "所有可用工具都已绑定",
   "bind": "绑定",
   "bindCount": "绑定 ({count})",
diff --git a/pages/api/apps/[id]/tools/[toolId].ts b/pages/api/apps/[id]/tools/[toolId].ts
index 77224cc..21ecef4 100644
--- a/pages/api/apps/[id]/tools/[toolId].ts
+++ b/pages/api/apps/[id]/tools/[toolId].ts
@@ -39,6 +39,25 @@ export default async function handler(req: NextApiRequest, res: NextApiResponse)
     }
 
     switch (method) {
+      case "PUT": {
+        // 更新应用的工具配置（custom_config / priority）。
+        // 权限（owner 或超管）由后端 require_app_owner_or_super 校验，
+        // 代理只做身份透传——这里重复实现一遍所有权判断只会两处漂移。
+        const body = typeof req.body === "string" ? JSON.parse(req.body) : req.body || {};
+        const payload: Record<string, unknown> = {};
+        if (body.custom_config !== undefined) payload.custom_config = body.custom_config;
+        if (body.priority !== undefined) payload.priority = body.priority;
+        if (Object.keys(payload).length === 0) {
+          return res.status(400).json({ error: "custom_config 或 priority 至少传一项" });
+        }
+        const updated = await axios.put(
+          `${BACKEND_URL}/api/v1/apps/${appId}/tools/${toolId}`,
+          payload,
+          { headers }
+        );
+        return res.status(200).json(updated.data);
+      }
+
       case "DELETE": {
         // 解绑工具
         await axios.delete(`${BACKEND_URL}/api/v1/apps/${appId}/tools/${toolId}`, { headers });
@@ -46,7 +65,7 @@ export default async function handler(req: NextApiRequest, res: NextApiResponse)
       }
 
       default:
-        res.setHeader("Allow", ["DELETE"]);
+        res.setHeader("Allow", ["PUT", "DELETE"]);
         return res.status(405).json({ error: `Method ${method} Not Allowed` });
     }
   } catch (error: any) {