diff --git a/ui/src/e2e/config-open-file-feedback.e2e.test.ts b/ui/src/e2e/config-open-file-feedback.e2e.test.ts
new file mode 100644
index 000000000000..14765d548dce
--- /dev/null
+++ b/ui/src/e2e/config-open-file-feedback.e2e.test.ts
@@ -0,0 +1,115 @@
+import { mkdir } from "node:fs/promises";
+import path from "node:path";
+import type { Page } from "playwright";
+import { expect, it } from "vitest";
+import { installMockGateway } from "../test-helpers/control-ui-e2e.ts";
+import { createControlUiE2eSuite } from "./control-ui-e2e-suite.test-support.ts";
+
+const suite = createControlUiE2eSuite({
+  name: "Control UI config open-file feedback mocked Gateway E2E",
+  startServerBeforeBrowser: true,
+});
+const configPath = "/tmp/openclaw-config-open-feedback/openclaw.json";
+const captureProof = process.env.OPENCLAW_CAPTURE_UI_PROOF === "1";
+const proofPath = path.resolve(".artifacts/control-ui-e2e/config-open-file-feedback/after.png");
+
+async function installClipboardProof(page: Page): Promise<void> {
+  await page.addInitScript(() => {
+    const copied: string[] = [];
+    Object.defineProperty(globalThis, "configOpenFileCopied", { value: copied });
+    Object.defineProperty(navigator, "clipboard", {
+      configurable: true,
+      value: {
+        writeText: async (text: string) => {
+          copied.push(text);
+        },
+      },
+    });
+  });
+}
+
+async function openRawSettings(page: Page, response?: unknown) {
+  await installClipboardProof(page);
+  const config = { laboratory: { enabled: true } };
+  const gateway = await installMockGateway(page, {
+    featureMethods: ["config.openFile"],
+    methodResponses: {
+      "config.get": {
+        config,
+        hash: "config-open-file-feedback",
+        issues: [],
+        path: configPath,
+        raw: JSON.stringify(config),
+        valid: true,
+      },
+      "config.schema": {
+        schema: {
+          type: "object",
+          properties: {
+            laboratory: {
+              type: "object",
+              properties: { enabled: { type: "boolean" } },
+            },
+          },
+        },
+        uiHints: {},
+        version: "config-open-file-feedback",
+      },
+      ...(response === undefined ? {} : { "config.openFile": response }),
+    },
+    operatorScopes: ["operator.read", "operator.admin"],
+  });
+  const navigation = await page.goto(`${suite.server.baseUrl}settings/advanced?section=laboratory`);
+  expect(navigation?.status()).toBe(200);
+  await page.getByRole("button", { name: "Raw", exact: true }).click();
+  return gateway;
+}
+
+async function expectOpenFailure(page: Page, message: string): Promise<void> {
+  const status = page.getByRole("status").filter({ hasText: message });
+  await expect.poll(() => status.count()).toBe(1);
+  await expect.poll(() => status.textContent()).toContain("File path copied to clipboard");
+  await expect.poll(() => status.textContent()).toContain(configPath);
+  await expect
+    .poll(() => page.evaluate(() => Reflect.get(globalThis, "configOpenFileCopied")))
+    .toEqual([configPath]);
+  expect(await page.getByText("Save failed", { exact: true }).count()).toBe(0);
+  expect(await page.getByRole("button", { name: "Retry", exact: true }).count()).toBe(0);
+  expect(await page.locator(".settings-save-indicator").count()).toBe(0);
+}
+
+suite.define(() => {
+  it("announces the path fallback when the host opener returns a failure", async () => {
+    await suite.withPage({ serviceWorkers: "block" }, async ({ page }) => {
+      await openRawSettings(page, {
+        ok: false,
+        path: configPath,
+        error: "No desktop opener is available.",
+      });
+
+      await page.getByRole("button", { name: "Open", exact: true }).click();
+
+      await expectOpenFailure(page, "No desktop opener is available.");
+      if (captureProof) {
+        await mkdir(path.dirname(proofPath), { recursive: true });
+        await page.screenshot({ animations: "disabled", fullPage: true, path: proofPath });
+      }
+    });
+  });
+
+  it("announces the path fallback when the open request rejects", async () => {
+    await suite.withPage({ serviceWorkers: "block" }, async ({ page }) => {
+      const gateway = await openRawSettings(page);
+      await gateway.deferNext("config.openFile");
+
+      await page.getByRole("button", { name: "Open", exact: true }).click();
+      await gateway.waitForRequest("config.openFile");
+      await gateway.rejectDeferred("config.openFile", {
+        code: "UNAVAILABLE",
+        message: "No desktop opener is available.",
+      });
+
+      await expectOpenFailure(page, "No desktop opener is available.");
+    });
+  });
+});
diff --git a/ui/src/lib/config/config-gateway-operations.ts b/ui/src/lib/config/config-gateway-operations.ts
index a0b0a7b2e2be..4babd68d9bbd 100644
--- a/ui/src/lib/config/config-gateway-operations.ts
+++ b/ui/src/lib/config/config-gateway-operations.ts
@@ -5,6 +5,7 @@ import type { ConfigSchemaResponse, ConfigSnapshot } from "../../api/types.ts";
 import { copyToClipboard } from "../clipboard.ts";
 import { serializeConfigForm } from "../config-form-utils.ts";
 import { formatUiError, formatUiExternalText } from "../format-error.ts";
+import { showToast } from "../toast.ts";
 import {
   adoptConfigSetAck,
   applyConfigSnapshot,
@@ -639,6 +640,21 @@ export async function openConfigFile(state: RuntimeConfigState): Promise<void> {
   const isCurrent = () => isCurrentConfigConnection(state, client, connectionEpoch);
   state.lastError = null;
   state.chatError = null;
+  const publishFailure = async (error: string, path?: string | null) => {
+    if (!isCurrent()) {
+      return;
+    }
+    let message = error;
+    if (path) {
+      message += (await copyToClipboard(path))
+        ? `\n\nFile path copied to clipboard: ${path}`
+        : `\n\nFile path: ${path}`;
+    }
+    if (isCurrent()) {
+      state.lastError = formatUiExternalText(message);
+      showToast({ message: state.lastError });
+    }
+  };
   try {
     const res = await client.request<{ ok: boolean; path?: string; error?: string }>(
       "config.openFile",
@@ -648,30 +664,12 @@ export async function openConfigFile(state: RuntimeConfigState): Promise<void> {
       return;
     }
     if (!res.ok) {
-      let errorMessage = formatUiExternalText(res.error, "Failed to open config file");
-      const path = res.path || state.configSnapshot?.path;
-      if (path) {
-        if (await copyToClipboard(path)) {
-          errorMessage += `\n\nFile path copied to clipboard: ${path}`;
-        } else {
-          errorMessage += `\n\nFile path: ${path}`;
-        }
-      }
-      if (isCurrent()) {
-        state.lastError = formatUiExternalText(errorMessage);
-      }
+      await publishFailure(
+        formatUiExternalText(res.error, "Failed to open config file"),
+        res.path || state.configSnapshot?.path,
+      );
     }
   } catch (err) {
-    if (!isCurrent()) {
-      return;
-    }
-    const errorMessage = formatUiError(err);
-    const path = state.configSnapshot?.path;
-    if (path) {
-      await copyToClipboard(path);
-    }
-    if (isCurrent()) {
-      state.lastError = errorMessage;
-    }
+    await publishFailure(formatUiError(err), state.configSnapshot?.path);
   }
 }