diff --git a/ui/web/src/i18n/locales/en/config.json b/ui/web/src/i18n/locales/en/config.json
index fb510c0c..3d5a4b17 100644
--- a/ui/web/src/i18n/locales/en/config.json
+++ b/ui/web/src/i18n/locales/en/config.json
@@ -211,6 +211,10 @@
   "tools.webSearch": "Web Search",
   "tools.webFetch": "Web fetch and browser automation",
   "tools.maxResults": "Max Results",
+  "tools.braveApiKey": "API key",
+  "tools.braveApiKeyTip": "Required to use Brave Search. Create a key at https://brave.com/search/api/",
+  "tools.braveApiKeyPlaceholder": "BSA…",
+  "tools.braveApiKeyManaged": "A key is already stored on the server and cannot be shown here.",
   "tools.webFetchPolicy": "Web Fetch Policy",
   "tools.webFetchPolicyTip": "Controls which URLs the agent can fetch. 'Allowlist' restricts to approved domains only.",
   "tools.allowedDomains": "Allowed Domains",
diff --git a/ui/web/src/i18n/locales/vi/config.json b/ui/web/src/i18n/locales/vi/config.json
index 3a4b82e8..2dcab871 100644
--- a/ui/web/src/i18n/locales/vi/config.json
+++ b/ui/web/src/i18n/locales/vi/config.json
@@ -211,6 +211,10 @@
   "tools.webSearch": "Tìm kiếm web",
   "tools.webFetch": "Tải web và tự động hóa trình duyệt",
   "tools.maxResults": "Kết quả tối đa",
+  "tools.braveApiKey": "API Key",
+  "tools.braveApiKeyTip": "Cần thiết để dùng Brave Search. Tạo khóa tại https://brave.com/search/api/",
+  "tools.braveApiKeyPlaceholder": "BSA…",
+  "tools.braveApiKeyManaged": "Khóa đã được lưu trên máy chủ và không thể hiển thị tại đây.",
   "tools.webFetchPolicy": "Chính sách tải web",
   "tools.webFetchPolicyTip": "Kiểm soát URL nào agent có thể tải. 'Danh sách cho phép' giới hạn chỉ các domain được duyệt.",
   "tools.allowedDomains": "Domain được phép",
diff --git a/ui/web/src/i18n/locales/zh/config.json b/ui/web/src/i18n/locales/zh/config.json
index fb8da047..561b629b 100644
--- a/ui/web/src/i18n/locales/zh/config.json
+++ b/ui/web/src/i18n/locales/zh/config.json
@@ -211,6 +211,10 @@
   "tools.webSearch": "网页搜索",
   "tools.webFetch": "网页抓取和浏览器自动化",
   "tools.maxResults": "最大结果数",
+  "tools.braveApiKey": "API 密钥",
+  "tools.braveApiKeyTip": "使用 Brave 搜索时需要。可在 https://brave.com/search/api/ 创建密钥",
+  "tools.braveApiKeyPlaceholder": "BSA…",
+  "tools.braveApiKeyManaged": "密钥已保存在服务器上，无法在此显示。",
   "tools.webFetchPolicy": "网页抓取策略",
   "tools.webFetchPolicyTip": "控制 Agent 可以抓取哪些 URL。\"允许列表\"仅限已批准的域名。",
   "tools.allowedDomains": "允许的域名",
diff --git a/ui/web/src/lib/secret.ts b/ui/web/src/lib/secret.ts
new file mode 100644
index 00000000..5d1c4408
--- /dev/null
+++ b/ui/web/src/lib/secret.ts
@@ -0,0 +1,4 @@
+/** Returns true if the value is a masked secret (contains "***"). */
+export function isSecret(val: unknown): boolean {
+  return typeof val === "string" && val.includes("***");
+}
diff --git a/ui/web/src/pages/config/sections/providers-section.tsx b/ui/web/src/pages/config/sections/providers-section.tsx
index 72b0d5b1..372ccc43 100644
--- a/ui/web/src/pages/config/sections/providers-section.tsx
+++ b/ui/web/src/pages/config/sections/providers-section.tsx
@@ -5,6 +5,7 @@ import { Button } from "@/components/ui/button";
 import { Input } from "@/components/ui/input";
 import { Label } from "@/components/ui/label";
 import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
+import { isSecret } from "@/lib/secret";
 
 type ProviderEntry = {
   api_key?: string;
@@ -28,10 +29,6 @@ const KNOWN_PROVIDERS = [
   { key: "ollama_cloud", label: "Ollama Cloud", envKey: "GOCLAW_OLLAMA_CLOUD_API_KEY" },
 ];
 
-function isSecret(val: unknown): boolean {
-  return typeof val === "string" && val.includes("***");
-}
-
 interface Props {
   data: ProvidersData | undefined;
   onSave: (value: ProvidersData) => Promise<void>;
diff --git a/ui/web/src/pages/config/sections/tools-web-section.tsx b/ui/web/src/pages/config/sections/tools-web-section.tsx
index 0544cd81..d6cba568 100644
--- a/ui/web/src/pages/config/sections/tools-web-section.tsx
+++ b/ui/web/src/pages/config/sections/tools-web-section.tsx
@@ -22,6 +22,7 @@ import {
 } from "@/components/ui/select";
 import { Separator } from "@/components/ui/separator";
 import { InfoLabel } from "@/components/shared/info-label";
+import { isSecret } from "@/lib/secret";
 
 /* eslint-disable @typescript-eslint/no-explicit-any */
 type ToolsData = Record<string, any>;
@@ -50,6 +51,18 @@ export function ToolsWebSection({ data, onSave, saving }: Props) {
     setDirty(true);
   };
 
+  const handleSave = () => {
+    const toSave: ToolsData = { ...draft };
+    const web = { ...(toSave.web ?? {}) };
+    const brave = { ...(web.brave ?? {}) };
+    if (isSecret(brave.api_key)) {
+      delete brave.api_key;
+    }
+    web.brave = brave;
+    toSave.web = web;
+    onSave(toSave);
+  };
+
   if (!data) return null;
 
   const web = draft.web ?? {};
@@ -79,6 +92,7 @@ export function ToolsWebSection({ data, onSave, saving }: Props) {
               <Label className="text-xs text-muted-foreground">{t("tools.maxResults")}</Label>
               <Input
                 type="number"
+                className="text-base md:text-sm"
                 value={ddg.max_results ?? ""}
                 onChange={(e) => updateNested("web", { duckduckgo: { ...ddg, max_results: Number(e.target.value) } })}
                 placeholder="5"
@@ -98,12 +112,33 @@ export function ToolsWebSection({ data, onSave, saving }: Props) {
               <Label className="text-xs text-muted-foreground">{t("tools.maxResults")}</Label>
               <Input
                 type="number"
+                className="text-base md:text-sm"
                 value={brave.max_results ?? ""}
                 onChange={(e) => updateNested("web", { brave: { ...brave, max_results: Number(e.target.value) } })}
                 placeholder="5"
                 min={1}
               />
             </div>
+            {brave.enabled && (
+              <div className="grid gap-1.5">
+                <InfoLabel tip={t("tools.braveApiKeyTip")}>{t("tools.braveApiKey")}</InfoLabel>
+                <Input
+                  type="password"
+                  className="text-base md:text-sm"
+                  value={brave.api_key ?? ""}
+                  disabled={isSecret(brave.api_key)}
+                  readOnly={isSecret(brave.api_key)}
+                  onChange={(e) =>
+                    updateNested("web", { brave: { ...brave, api_key: e.target.value } })
+                  }
+                  placeholder={t("tools.braveApiKeyPlaceholder")}
+                  autoComplete="off"
+                />
+                {isSecret(brave.api_key) && (
+                  <p className="text-xs text-muted-foreground">{t("tools.braveApiKeyManaged")}</p>
+                )}
+              </div>
+            )}
           </div>
         </div>
 
@@ -181,7 +216,7 @@ export function ToolsWebSection({ data, onSave, saving }: Props) {
 
         {dirty && (
           <div className="flex justify-end pt-2">
-            <Button size="sm" onClick={() => onSave(draft)} disabled={saving} className="gap-1.5">
+            <Button size="sm" onClick={handleSave} disabled={saving} className="gap-1.5">
               <Save className="h-3.5 w-3.5" /> {saving ? t("saving") : t("save")}
             </Button>
           </div>