diff --git a/platform_web/api/client.test.ts b/platform_web/api/client.test.ts
index 2b03832..ee9cb94 100644
--- a/platform_web/api/client.test.ts
+++ b/platform_web/api/client.test.ts
@@ -810,6 +810,38 @@ describe("PlatformApiClient AI providers", () => {
     expect(onAuthFailure).not.toHaveBeenCalled();
   });
 
+  it("surfaces safe validation details for delete denials", async () => {
+    vi.stubGlobal("fetch", vi.fn(async () => new Response(JSON.stringify({
+      code: "validation_failed",
+      message: "validation failed",
+      details: [
+        "running or installing server instances must be stopped before delete",
+        "config path /Users/operator/private/server.ini is unavailable"
+      ]
+    }), { status: 400, headers: { "Content-Type": "application/json" } })));
+
+    const client = new PlatformApiClient("/api/v1", () => "owner-session");
+    await expect(client.deleteServerInstance("running-server", { password: "secret-password" })).rejects.toMatchObject({
+      status: 400,
+      code: "validation_failed",
+      message: "运行中或安装中的服务器必须先停止再删除。；config path [host-path] is unavailable"
+    });
+  });
+
+  it("surfaces password confirmation denials without exposing generic forbidden text", async () => {
+    vi.stubGlobal("fetch", vi.fn(async () => new Response(JSON.stringify({
+      code: "forbidden",
+      message: "password confirmation failed"
+    }), { status: 403, headers: { "Content-Type": "application/json" } })));
+
+    const client = new PlatformApiClient("/api/v1", () => "owner-session");
+    await expect(client.deleteServerInstance("server-1", { password: "wrong-password" })).rejects.toMatchObject({
+      status: 403,
+      code: "forbidden",
+      message: "当前登录密码不正确，请重新输入。"
+    });
+  });
+
   it("surfaces allow-listed plugin capability denials", async () => {
     vi.stubGlobal("fetch", vi.fn(async () => new Response(JSON.stringify({
       code: "forbidden",
diff --git a/platform_web/api/client.ts b/platform_web/api/client.ts
index 8043f62..d9efb74 100644
--- a/platform_web/api/client.ts
+++ b/platform_web/api/client.ts
@@ -752,7 +752,9 @@ async function responseError(response: Response): Promise<PlatformApiError> {
   const apiError = await safeReadError(response);
   const message = response.status === 401
     ? "会话已失效，请重新登录。"
-    : response.status === 403
+    : apiError?.code === "validation_failed"
+      ? safeValidationMessage(apiError)
+      : response.status === 403
       ? safeForbiddenMessage(apiError?.message)
       : apiError?.message ?? `request failed: ${response.status}`;
   const error = new PlatformApiError(response.status, apiError?.code ?? "request_failed", message);
@@ -763,11 +765,37 @@ async function responseError(response: Response): Promise<PlatformApiError> {
   return error;
 }
 
+function safeValidationMessage(apiError?: ApiErrorResponse | null): string {
+  const details = apiError?.details
+    ?.map((detail) => safeValidationDetail(detail))
+    .filter((detail): detail is string => Boolean(detail));
+  if (details?.length) {
+    return details.slice(0, 3).join("；");
+  }
+  const sanitized = safeDiagnosticText(apiError?.message, "")?.trim();
+  return sanitized || "请求校验失败。";
+}
+
+function safeValidationDetail(detail: string): string | undefined {
+  const sanitized = safeDiagnosticText(detail, "")?.trim();
+  switch (sanitized) {
+    case "password is required":
+      return "请输入当前登录密码。";
+    case "running or installing server instances must be stopped before delete":
+      return "运行中或安装中的服务器必须先停止再删除。";
+    default:
+      return sanitized || undefined;
+  }
+}
+
 function safeForbiddenMessage(apiMessage?: string): string {
   const sanitized = safeDiagnosticText(apiMessage, "")?.trim();
   if (!sanitized || sanitized === "account is not allowed to access this resource") {
     return "没有权限访问该资源。";
   }
+  if (sanitized === "password confirmation failed") {
+    return "当前登录密码不正确，请重新输入。";
+  }
   const missingPermission = sanitized.match(/^plugin does not declare required permission:\s*([a-z0-9._-]+)$/i);
   if (missingPermission) {
     return `插件未声明所需权限：${missingPermission[1]}`;