feat(core,cli)!: Implement in-process agent backend for arenas

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

Add InProcessBackend to run subagents in-process rather than via subprocess,

enabling faster initialization and better resource management for agent

collaboration arenas.

Key changes:

- Add InProcessBackend with sandboxed in-process agent execution

- Refactor agent runtime into headless vs interactive modes

- Add AsyncMessageQueue utility for agent message passing

- Update ArenaManager with backend selection (in-process vs subprocess)

- Refactor subagent types/exports; consolidate in subagents/types

- Remove deprecated agent-hooks.ts (functionality merged into runtime)

- Update task tool to support new agent lifecycle

Breaking: Subagent type exports restructured; import from subagents/types

packages/cli/src/ui/commands/arenaCommand.test.ts

@@ -7,7 +7,7 @@
 import { describe, it, expect, vi, beforeEach } from 'vitest';
 import {
   type ArenaManager,
-  ArenaAgentStatus,
+  AgentStatus,
   ArenaSessionStatus,
 } from '@qwen-code/qwen-code-core';
 import { arenaCommand } from './arenaCommand.js';
@@ -242,7 +242,7 @@ describe('arenaCommand select subcommand', () => {
       getAgentStates: vi.fn(() => [
         {
           agentId: 'agent-1',
-          status: ArenaAgentStatus.TERMINATED,
+          status: AgentStatus.FAILED,
           model: { modelId: 'model-1' },
         },
       ]),
@@ -267,12 +267,12 @@ describe('arenaCommand select subcommand', () => {
       getAgentStates: vi.fn(() => [
         {
           agentId: 'agent-1',
-          status: ArenaAgentStatus.COMPLETED,
+          status: AgentStatus.COMPLETED,
           model: { modelId: 'model-1' },
         },
         {
           agentId: 'agent-2',
-          status: ArenaAgentStatus.COMPLETED,
+          status: AgentStatus.COMPLETED,
           model: { modelId: 'model-2' },
         },
       ]),
@@ -294,12 +294,12 @@ describe('arenaCommand select subcommand', () => {
       getAgentStates: vi.fn(() => [
         {
           agentId: 'agent-1',
-          status: ArenaAgentStatus.COMPLETED,
+          status: AgentStatus.COMPLETED,
           model: { modelId: 'gpt-4o', displayName: 'gpt-4o' },
         },
         {
           agentId: 'agent-2',
-          status: ArenaAgentStatus.COMPLETED,
+          status: AgentStatus.COMPLETED,
           model: { modelId: 'claude-sonnet', displayName: 'claude-sonnet' },
         },
       ]),
@@ -327,7 +327,7 @@ describe('arenaCommand select subcommand', () => {
       getAgentStates: vi.fn(() => [
         {
           agentId: 'agent-1',
-          status: ArenaAgentStatus.COMPLETED,
+          status: AgentStatus.COMPLETED,
           model: { modelId: 'gpt-4o', displayName: 'gpt-4o' },
         },
       ]),
@@ -350,7 +350,7 @@ describe('arenaCommand select subcommand', () => {
       getAgentStates: vi.fn(() => [
         {
           agentId: 'agent-1',
-          status: ArenaAgentStatus.COMPLETED,
+          status: AgentStatus.COMPLETED,
           model: { modelId: 'gpt-4o' },
         },
       ]),
@@ -373,7 +373,7 @@ describe('arenaCommand select subcommand', () => {
       getAgentStates: vi.fn(() => [
         {
           agentId: 'agent-1',
-          status: ArenaAgentStatus.COMPLETED,
+          status: AgentStatus.COMPLETED,
           model: { modelId: 'gpt-4o' },
         },
       ]),

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

@@ -16,7 +16,8 @@ import { CommandKind } from './types.js';
 import {
   ArenaManager,
   ArenaEventType,
-  ArenaAgentStatus,
+  AgentStatus,
+  isTerminalStatus,
   ArenaSessionStatus,
   AuthType,
   createDebugLogger,
@@ -246,41 +247,23 @@ function executeArenaCommand(
 
   const buildAgentCardData = (
     result: ArenaAgentCompleteEvent['result'],
-  ): ArenaAgentCardData => {
-    let status: ArenaAgentCardData['status'];
-    switch (result.status) {
-      case ArenaAgentStatus.COMPLETED:
-        status = 'completed';
-        break;
-      case ArenaAgentStatus.CANCELLED:
-        status = 'cancelled';
-        break;
-      default:
-        status = 'terminated';
-        break;
-    }
-    return {
-      label: result.model.displayName || result.model.modelId,
-      status,
-      durationMs: result.stats.durationMs,
-      totalTokens: result.stats.totalTokens,
-      inputTokens: result.stats.inputTokens,
-      outputTokens: result.stats.outputTokens,
-      toolCalls: result.stats.toolCalls,
-      successfulToolCalls: result.stats.successfulToolCalls,
-      failedToolCalls: result.stats.failedToolCalls,
-      rounds: result.stats.rounds,
-      error: result.error,
-      diff: result.diff,
-    };
-  };
+  ): ArenaAgentCardData => ({
+    label: result.model.displayName || result.model.modelId,
+    status: result.status,
+    durationMs: result.stats.durationMs,
+    totalTokens: result.stats.totalTokens,
+    inputTokens: result.stats.inputTokens,
+    outputTokens: result.stats.outputTokens,
+    toolCalls: result.stats.toolCalls,
+    successfulToolCalls: result.stats.successfulToolCalls,
+    failedToolCalls: result.stats.failedToolCalls,
+    rounds: result.stats.rounds,
+    error: result.error,
+    diff: result.diff,
+  });
 
   const handleAgentComplete = (event: ArenaAgentCompleteEvent) => {
-    if (
-      event.result.status !== ArenaAgentStatus.COMPLETED &&
-      event.result.status !== ArenaAgentStatus.CANCELLED &&
-      event.result.status !== ArenaAgentStatus.TERMINATED
-    ) {
+    if (!isTerminalStatus(event.result.status)) {
       return;
     }
 
@@ -598,7 +581,7 @@ export const arenaCommand: SlashCommand = {
 
         const agents = manager.getAgentStates();
         const hasSuccessful = agents.some(
-          (a) => a.status === ArenaAgentStatus.COMPLETED,
+          (a) => a.status === AgentStatus.COMPLETED,
         );
 
         if (!hasSuccessful) {
@@ -616,7 +599,7 @@ export const arenaCommand: SlashCommand = {
           const matchingAgent = agents.find((a) => {
             const label = a.model.displayName || a.model.modelId;
             return (
-              a.status === ArenaAgentStatus.COMPLETED &&
+              a.status === AgentStatus.COMPLETED &&
               (label.toLowerCase() === trimmedArgs.toLowerCase() ||
                 a.model.modelId.toLowerCase() === trimmedArgs.toLowerCase())
             );

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

@@ -9,7 +9,7 @@ import { useCallback, useMemo } from 'react';
 import { Box, Text } from 'ink';
 import {
   type ArenaManager,
-  ArenaAgentStatus,
+  AgentStatus,
   type Config,
 } from '@qwen-code/qwen-code-core';
 import { theme } from '../semantic-colors.js';
@@ -138,7 +138,7 @@ export function ArenaSelectDialog({
         // Build diff summary from cached result if available
         let diffAdditions = 0;
         let diffDeletions = 0;
-        if (agent.status === ArenaAgentStatus.COMPLETED && result) {
+        if (agent.status === AgentStatus.COMPLETED && result) {
           const agentResult = result.agents.find(
             (a) => a.agentId === agent.agentId,
           );
@@ -182,7 +182,7 @@ export function ArenaSelectDialog({
           value: agent.agentId,
           title,
           description,
-          disabled: agent.status !== ArenaAgentStatus.COMPLETED,
+          disabled: agent.status !== AgentStatus.COMPLETED,
         };
       }),
     [agents, result],

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

@@ -10,7 +10,7 @@ import { Box, Text } from 'ink';
 import {
   type ArenaManager,
   type ArenaAgentState,
-  ArenaAgentStatus,
+  isTerminalStatus,
   ArenaSessionStatus,
 } from '@qwen-code/qwen-code-core';
 import { theme } from '../semantic-colors.js';
@@ -42,11 +42,7 @@ function pad(
 }
 
 function getElapsedMs(agent: ArenaAgentState): number {
-  if (
-    agent.status === ArenaAgentStatus.COMPLETED ||
-    agent.status === ArenaAgentStatus.TERMINATED ||
-    agent.status === ArenaAgentStatus.CANCELLED
-  ) {
+  if (isTerminalStatus(agent.status)) {
     return agent.stats.durationMs;
   }
   return Date.now() - agent.startedAt;

packages/cli/src/ui/types.ts

@@ -11,6 +11,7 @@ import type {
   ToolCallConfirmationDetails,
   ToolConfirmationOutcome,
   ToolResultDisplay,
+  AgentStatus,
 } from '@qwen-code/qwen-code-core';
 import type { PartListUnion } from '@google/genai';
 import { type ReactNode } from 'react';
@@ -266,7 +267,7 @@ export type HistoryItemMcpStatus = HistoryItemBase & {
  */
 export interface ArenaAgentCardData {
   label: string;
-  status: 'completed' | 'cancelled' | 'terminated';
+  status: AgentStatus;
   durationMs: number;
   totalTokens: number;
   inputTokens: number;

packages/cli/src/ui/utils/displayUtils.ts

@@ -5,7 +5,7 @@
  */
 
 import { theme } from '../semantic-colors.js';
-import { ArenaAgentStatus } from '@qwen-code/qwen-code-core';
+import { AgentStatus } from '@qwen-code/qwen-code-core';
 
 // --- Status Labels ---
 
@@ -15,24 +15,17 @@ export interface StatusLabel {
   color: string;
 }
 
-export function getArenaStatusLabel(
-  status: ArenaAgentStatus | string,
-): StatusLabel {
+export function getArenaStatusLabel(status: AgentStatus): StatusLabel {
   switch (status) {
-    case ArenaAgentStatus.COMPLETED:
-    case 'completed':
+    case AgentStatus.COMPLETED:
       return { icon: '✓', text: 'Done', color: theme.status.success };
-    case ArenaAgentStatus.CANCELLED:
-    case 'cancelled':
+    case AgentStatus.CANCELLED:
       return { icon: '⊘', text: 'Cancelled', color: theme.status.warning };
-    case ArenaAgentStatus.TERMINATED:
-    case 'terminated':
-      return { icon: '✗', text: 'Terminated', color: theme.status.error };
-    case ArenaAgentStatus.RUNNING:
-    case 'running':
+    case AgentStatus.FAILED:
+      return { icon: '✗', text: 'Failed', color: theme.status.error };
+    case AgentStatus.RUNNING:
       return { icon: '○', text: 'Running', color: theme.text.secondary };
-    case ArenaAgentStatus.INITIALIZING:
-    case 'initializing':
+    case AgentStatus.INITIALIZING:
       return { icon: '○', text: 'Initializing', color: theme.text.secondary };
     default:
       return { icon: '○', text: status, color: theme.text.secondary };