Deprecate read_many_files tool (#12861)

packages/cli/src/ui/commands/toolsCommand.ts

@@ -10,6 +10,7 @@ import {
   CommandKind,
 } from './types.js';
 import { MessageType, type HistoryItemToolsList } from '../types.js';
+import { READ_MANY_FILES_TOOL_NAME } from '@google/gemini-cli-core';
 
 export const toolsCommand: SlashCommand = {
   name: 'tools',
@@ -44,7 +45,10 @@ export const toolsCommand: SlashCommand = {
       type: MessageType.TOOLS_LIST,
       tools: geminiTools.map((tool) => ({
         name: tool.name,
-        displayName: tool.displayName,
+        displayName:
+          tool.name === READ_MANY_FILES_TOOL_NAME
+            ? `${tool.displayName} (Deprecated)`
+            : tool.displayName,
         description: tool.description,
       })),
       showDescriptions: useShowDescriptions,