refactor(core,cli): remove strategic_intent from update_topic tool

Removing the strategic_intent parameter to streamline narration and avoid
redundancy. Updates tool schema, state management, UI rendering, and
prompt instructions while maintaining summary field utility.

packages/cli/src/ui/components/messages/ToolGroupMessage.test.tsx

@@ -10,7 +10,7 @@ import { ToolGroupMessage } from './ToolGroupMessage.js';
 import {
   UPDATE_TOPIC_TOOL_NAME,
   TOPIC_PARAM_TITLE,
-  TOPIC_PARAM_STRATEGIC_INTENT,
+  TOPIC_PARAM_SUMMARY,
   makeFakeConfig,
   CoreToolCallStatus,
   ApprovalMode,
@@ -264,7 +264,6 @@ describe('<ToolGroupMessage />', () => {
           name: UPDATE_TOPIC_TOOL_NAME,
           args: {
             [TOPIC_PARAM_TITLE]: 'Testing Topic',
-            [TOPIC_PARAM_STRATEGIC_INTENT]: 'This is the description',
           },
         }),
       ];
@@ -280,19 +279,18 @@ describe('<ToolGroupMessage />', () => {
 
       const output = lastFrame();
       expect(output).toContain('Testing Topic');
-      expect(output).toContain('— This is the description');
       expect(output).toMatchSnapshot('update_topic_tool');
       unmount();
     });
 
-    it('renders update_topic tool call with summary instead of strategic_intent', async () => {
+    it('renders update_topic tool call with summary', async () => {
       const toolCalls = [
         createToolCall({
           callId: 'topic-tool-summary',
           name: UPDATE_TOPIC_TOOL_NAME,
           args: {
             [TOPIC_PARAM_TITLE]: 'Testing Topic',
-            summary: 'This is the summary',
+            [TOPIC_PARAM_SUMMARY]: 'This is the summary',
           },
         }),
       ];
@@ -319,7 +317,7 @@ describe('<ToolGroupMessage />', () => {
           name: UPDATE_TOPIC_TOOL_NAME,
           args: {
             [TOPIC_PARAM_TITLE]: 'Testing Topic',
-            [TOPIC_PARAM_STRATEGIC_INTENT]: 'This is the description',
+            [TOPIC_PARAM_SUMMARY]: 'This is the summary',
           },
         }),
         createToolCall({

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

@@ -11,7 +11,6 @@ import {
   UPDATE_TOPIC_DISPLAY_NAME,
   TOPIC_PARAM_TITLE,
   TOPIC_PARAM_SUMMARY,
-  TOPIC_PARAM_STRATEGIC_INTENT,
 } from '@google/gemini-cli-core';
 import type { IndividualToolCallDisplay } from '../../types.js';
 import { theme } from '../../semantic-colors.js';
@@ -26,16 +25,22 @@ export const isTopicTool = (name: string): boolean =>
 export const TopicMessage: React.FC<TopicMessageProps> = ({ args }) => {
   const rawTitle = args?.[TOPIC_PARAM_TITLE];
   const title = typeof rawTitle === 'string' ? rawTitle : undefined;
-  const rawIntent =
-    args?.[TOPIC_PARAM_STRATEGIC_INTENT] || args?.[TOPIC_PARAM_SUMMARY];
-  const intent = typeof rawIntent === 'string' ? rawIntent : undefined;
+  const rawSummary = args?.[TOPIC_PARAM_SUMMARY];
+  const summary = typeof rawSummary === 'string' ? rawSummary : undefined;
 
+  // Use summary as a fallback subtitle if title is present,
+  // or use it as the main text if title is missing.
   return (
     <Box flexDirection="row" marginLeft={2}>
       <Text color={theme.text.primary} bold>
         {title || 'Topic'}
       </Text>
-      {intent && <Text color={theme.text.secondary}> — {intent}</Text>}
+      {summary && (
+        <Text color={theme.text.secondary} wrap="truncate-end">
+          {' — '}
+          {summary.length > 80 ? `${summary.substring(0, 80)}...` : summary}
+        </Text>
+      )}
     </Box>
   );
 };

packages/cli/src/ui/components/messages/__snapshots__/ToolGroupMessage.test.tsx.snap

@@ -77,7 +77,7 @@ exports[`<ToolGroupMessage /> > Golden Snapshots > renders header when scrolled
 `;
 
 exports[`<ToolGroupMessage /> > Golden Snapshots > renders mixed tool calls including update_topic 1`] = `
-"  Testing Topic — This is the description
+"  Testing Topic — This is the summary
 ╭──────────────────────────────────────────────────────────────────────────╮
 │ ✓  read_file Read a file                                                 │
 │                                                                          │
@@ -141,7 +141,7 @@ exports[`<ToolGroupMessage /> > Golden Snapshots > renders two tool groups where
 `;
 
 exports[`<ToolGroupMessage /> > Golden Snapshots > renders update_topic tool call using TopicMessage > update_topic_tool 1`] = `
-"  Testing Topic — This is the description
+"  Testing Topic
 "
 `;