Emit a warning when memory usage exceeds 7GB (#7613)

packages/cli/src/ui/components/HistoryItemDisplay.tsx

@@ -14,6 +14,7 @@ import { ErrorMessage } from './messages/ErrorMessage.js';
 import { ToolGroupMessage } from './messages/ToolGroupMessage.js';
 import { GeminiMessageContent } from './messages/GeminiMessageContent.js';
 import { CompressionMessage } from './messages/CompressionMessage.js';
+import { WarningMessage } from './messages/WarningMessage.js';
 import { Box } from 'ink';
 import { AboutBox } from './AboutBox.js';
 import { StatsDisplay } from './StatsDisplay.js';
@@ -66,6 +67,7 @@ export const HistoryItemDisplay: React.FC<HistoryItemDisplayProps> = ({
       />
     )}
     {item.type === 'info' && <InfoMessage text={item.text} />}
+    {item.type === 'warning' && <WarningMessage text={item.text} />}
     {item.type === 'error' && <ErrorMessage text={item.text} />}
     {item.type === 'about' && (
       <AboutBox

packages/cli/src/ui/components/messages/WarningMessage.tsx

@@ -0,0 +1,32 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import type React from 'react';
+import { Box, Text } from 'ink';
+import { Colors } from '../../colors.js';
+import { RenderInline } from '../../utils/InlineMarkdownRenderer.js';
+
+interface WarningMessageProps {
+  text: string;
+}
+
+export const WarningMessage: React.FC<WarningMessageProps> = ({ text }) => {
+  const prefix = '⚠ ';
+  const prefixWidth = 3;
+
+  return (
+    <Box flexDirection="row" marginTop={1}>
+      <Box width={prefixWidth}>
+        <Text color={Colors.AccentYellow}>{prefix}</Text>
+      </Box>
+      <Box flexGrow={1}>
+        <Text wrap="wrap" color={Colors.AccentYellow}>
+          <RenderInline text={text} />
+        </Text>
+      </Box>
+    </Box>
+  );
+};