refactor(core): rename TaskTool to AgentTool

Rename the Task tool to Agent tool for clearer semantics and better
alignment with industry terminology. This change includes:

- Rename TaskTool -> AgentTool, TaskParams -> AgentParams
- Rename TaskResultDisplay -> AgentResultDisplay
- Add 'Explore' built-in agent for read-only codebase exploration
- Add backward compatibility mappings for legacy tool names
- Improve Agent tool description with clearer usage guidelines
- Add case-insensitive agent name matching
- Fallback to built-in agents when subagent loading fails

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

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

@@ -16,7 +16,7 @@ import { MaxSizedBox } from '../shared/MaxSizedBox.js';
 import { TodoDisplay } from '../TodoDisplay.js';
 import type {
   TodoResultDisplay,
-  TaskResultDisplay,
+  AgentResultDisplay,
   PlanResultDisplay,
   AnsiOutput,
   Config,
@@ -50,7 +50,7 @@ type DisplayRendererResult =
   | { type: 'plan'; data: PlanResultDisplay }
   | { type: 'string'; data: string }
   | { type: 'diff'; data: { fileDiff: string; fileName: string } }
-  | { type: 'task'; data: TaskResultDisplay }
+  | { type: 'task'; data: AgentResultDisplay }
   | { type: 'ansi'; data: AnsiOutput };
 
 /**
@@ -98,7 +98,7 @@ const useResultDisplayRenderer = (
     ) {
       return {
         type: 'task',
-        data: resultDisplay as TaskResultDisplay,
+        data: resultDisplay as AgentResultDisplay,
       };
     }
 
@@ -169,7 +169,7 @@ const PlanResultRenderer: React.FC<{
  * Component to render subagent execution results
  */
 const SubagentExecutionRenderer: React.FC<{
-  data: TaskResultDisplay;
+  data: AgentResultDisplay;
   availableHeight?: number;
   childWidth: number;
   config: Config;

packages/cli/src/ui/components/subagents/runtime/AgentExecutionDisplay.tsx

@@ -7,7 +7,7 @@
 import React, { useMemo } from 'react';
 import { Box, Text } from 'ink';
 import type {
-  TaskResultDisplay,
+  AgentResultDisplay,
   AgentStatsSummary,
   Config,
 } from '@qwen-code/qwen-code-core';
@@ -20,7 +20,7 @@ import { ToolConfirmationMessage } from '../../messages/ToolConfirmationMessage.
 export type DisplayMode = 'compact' | 'default' | 'verbose';
 
 export interface AgentExecutionDisplayProps {
-  data: TaskResultDisplay;
+  data: AgentResultDisplay;
   availableHeight?: number;
   childWidth: number;
   config: Config;
@@ -28,7 +28,7 @@ export interface AgentExecutionDisplayProps {
 
 const getStatusColor = (
   status:
-    | TaskResultDisplay['status']
+    | AgentResultDisplay['status']
     | 'executing'
     | 'success'
     | 'awaiting_approval',
@@ -50,7 +50,7 @@ const getStatusColor = (
   }
 };
 
-const getStatusText = (status: TaskResultDisplay['status']) => {
+const getStatusText = (status: AgentResultDisplay['status']) => {
   switch (status) {
     case 'running':
       return 'Running';
@@ -301,7 +301,7 @@ const TaskPromptSection: React.FC<{
  * Status dot component with similar height as text
  */
 const StatusDot: React.FC<{
-  status: TaskResultDisplay['status'];
+  status: AgentResultDisplay['status'];
 }> = ({ status }) => (
   <Box marginLeft={1} marginRight={1}>
     <Text color={getStatusColor(status)}>●</Text>
@@ -312,7 +312,7 @@ const StatusDot: React.FC<{
  * Status indicator component
  */
 const StatusIndicator: React.FC<{
-  status: TaskResultDisplay['status'];
+  status: AgentResultDisplay['status'];
 }> = ({ status }) => {
   const color = getStatusColor(status);
   const text = getStatusText(status);
@@ -323,7 +323,7 @@ const StatusIndicator: React.FC<{
  * Tool calls list - format consistent with ToolInfo in ToolMessage.tsx
  */
 const ToolCallsList: React.FC<{
-  toolCalls: TaskResultDisplay['toolCalls'];
+  toolCalls: AgentResultDisplay['toolCalls'];
   displayMode: DisplayMode;
 }> = ({ toolCalls, displayMode }) => {
   const calls = toolCalls || [];
@@ -435,7 +435,7 @@ const ToolCallItem: React.FC<{
  * Execution summary details component
  */
 const ExecutionSummaryDetails: React.FC<{
-  data: TaskResultDisplay;
+  data: AgentResultDisplay;
   displayMode: DisplayMode;
 }> = ({ data, displayMode: _displayMode }) => {
   const stats = data.executionSummary;
@@ -505,7 +505,7 @@ const ToolUsageStats: React.FC<{
  * Results section for completed executions - matches the clean layout from the image
  */
 const ResultsSection: React.FC<{
-  data: TaskResultDisplay;
+  data: AgentResultDisplay;
   displayMode: DisplayMode;
 }> = ({ data, displayMode }) => (
   <Box flexDirection="column" gap={1}>