refactor: Extract ACP client factory into standalone module

Move client creation logic from Conductor.createClient into a new AcpClientFactory module for better separation of concerns and testability. No behavior changes.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

src/main/conductor/AcpClientFactory.ts

@@ -0,0 +1,91 @@
+/**
+ * AcpClientFactory - Creates ACP SDK Client implementations
+ *
+ * Handles session update notifications and permission requests from agents.
+ */
+import type {
+  Client,
+  SessionNotification,
+  RequestPermissionRequest,
+  RequestPermissionResponse,
+} from '@agentclientprotocol/sdk'
+import type { SessionStore } from '../session/SessionStore'
+
+export interface AcpClientCallbacks {
+  onSessionUpdate?: (update: SessionNotification) => void
+  onPermissionRequest?: (
+    params: RequestPermissionRequest
+  ) => Promise<RequestPermissionResponse>
+}
+
+export interface AcpClientFactoryOptions {
+  sessionStore: SessionStore | null
+  callbacks: AcpClientCallbacks
+}
+
+/**
+ * Create an ACP Client implementation for a session
+ *
+ * @param sessionId - The Multica session ID (used for persistence)
+ * @param options - Factory options including store and callbacks
+ */
+export function createAcpClient(
+  sessionId: string,
+  options: AcpClientFactoryOptions
+): Client {
+  const { sessionStore, callbacks } = options
+
+  return {
+    // Handle session updates from agent
+    sessionUpdate: async (params: SessionNotification) => {
+      // Log the update type
+      const update = params.update
+      if ('sessionUpdate' in update) {
+        const updateType = update.sessionUpdate
+        if (updateType === 'agent_message_chunk') {
+          const contentType = update.content?.type || 'unknown'
+          console.log(`[ACP] Session ${sessionId} update: ${updateType} (${contentType})`)
+        } else if (updateType === 'tool_call') {
+          console.log(`[ACP] Session ${sessionId} update: ${updateType} - ${update.title} [${update.status}]`)
+        } else if (updateType === 'tool_call_update') {
+          console.log(`[ACP] Session ${sessionId} update: ${updateType} [${update.status}]`)
+        } else {
+          console.log(`[ACP] Session ${sessionId} update: ${updateType}`, update)
+        }
+      } else {
+        console.log(`[ACP] Session ${sessionId} update (raw):`, params)
+      }
+
+      // Store raw update to SessionStore (if available)
+      if (sessionStore) {
+        try {
+          await sessionStore.appendUpdate(sessionId, params)
+        } catch (err) {
+          console.error('[Conductor] Failed to store session update:', err)
+        }
+      }
+
+      // Trigger UI callback
+      if (callbacks.onSessionUpdate) {
+        callbacks.onSessionUpdate(params)
+      }
+    },
+
+    // Handle permission requests from agent
+    requestPermission: async (
+      params: RequestPermissionRequest
+    ): Promise<RequestPermissionResponse> => {
+      if (callbacks.onPermissionRequest) {
+        return callbacks.onPermissionRequest(params)
+      }
+      // Default: auto-approve (V1 simplification)
+      console.log(`[Conductor] Auto-approving: ${params.toolCall.title}`)
+      return {
+        outcome: {
+          outcome: 'selected',
+          optionId: params.options[0]?.optionId ?? '',
+        },
+      }
+    },
+  }
+}

src/main/conductor/Conductor.ts

@@ -1,11 +1,15 @@
 /**
  * Conductor - Central orchestrator for ACP agent communication
+ *
+ * Responsibilities:
+ * - Session lifecycle management (create, resume, load, delete)
+ * - Agent process orchestration
+ * - Prompt handling with history replay
  */
 import {
   ClientSideConnection,
   ndJsonStream,
   PROTOCOL_VERSION,
-  type Client,
   type SessionNotification,
   type RequestPermissionRequest,
   type RequestPermissionResponse,
@@ -13,6 +17,7 @@ import {
 import { AgentProcess } from './AgentProcess'
 import { SessionStore } from '../session/SessionStore'
 import { DEFAULT_AGENTS } from '../config/defaults'
+import { createAcpClient } from './AcpClientFactory'
 import type {
   AgentConfig,
   MulticaSession,
@@ -106,7 +111,14 @@ export class Conductor {
 
     // Create client-side connection with our Client implementation
     const connection = new ClientSideConnection(
-      (_agent) => this.createClient(sessionId),
+      (_agent) =>
+        createAcpClient(sessionId, {
+          sessionStore: this.sessionStore,
+          callbacks: {
+            onSessionUpdate: this.events.onSessionUpdate,
+            onPermissionRequest: this.events.onPermissionRequest,
+          },
+        }),
       stream
     )
 
@@ -491,63 +503,4 @@ export class Conductor {
   getProcessingSessionIds(): string[] {
     return Array.from(this.processingSessions)
   }
-
-  /**
-   * Create the Client implementation for ACP SDK
-   */
-  private createClient(sessionId: string): Client {
-    return {
-      // Handle session updates from agent
-      sessionUpdate: async (params: SessionNotification) => {
-        // Log the update type
-        const update = params.update
-        if ('sessionUpdate' in update) {
-          const updateType = update.sessionUpdate
-          if (updateType === 'agent_message_chunk') {
-            const contentType = update.content?.type || 'unknown'
-            console.log(`[ACP] Session ${sessionId} update: ${updateType} (${contentType})`)
-          } else if (updateType === 'tool_call') {
-            console.log(`[ACP] Session ${sessionId} update: ${updateType} - ${update.title} [${update.status}]`)
-          } else if (updateType === 'tool_call_update') {
-            console.log(`[ACP] Session ${sessionId} update: ${updateType} [${update.status}]`)
-          } else {
-            console.log(`[ACP] Session ${sessionId} update: ${updateType}`, update)
-          }
-        } else {
-          console.log(`[ACP] Session ${sessionId} update (raw):`, params)
-        }
-
-        // Store raw update to SessionStore (if available)
-        if (this.sessionStore) {
-          try {
-            await this.sessionStore.appendUpdate(sessionId, params)
-          } catch (err) {
-            console.error('[Conductor] Failed to store session update:', err)
-          }
-        }
-
-        // Trigger UI callback
-        if (this.events.onSessionUpdate) {
-          this.events.onSessionUpdate(params)
-        }
-      },
-
-      // Handle permission requests from agent
-      requestPermission: async (
-        params: RequestPermissionRequest
-      ): Promise<RequestPermissionResponse> => {
-        if (this.events.onPermissionRequest) {
-          return this.events.onPermissionRequest(params)
-        }
-        // Default: auto-approve (V1 simplification)
-        console.log(`[Conductor] Auto-approving: ${params.toolCall.title}`)
-        return {
-          outcome: {
-            outcome: 'selected',
-            optionId: params.options[0]?.optionId ?? '',
-          },
-        }
-      },
-    }
-  }
 }

src/main/conductor/index.ts

@@ -1,3 +1,5 @@
 export { Conductor } from './Conductor'
 export { AgentProcess } from './AgentProcess'
+export { createAcpClient } from './AcpClientFactory'
 export type { SessionUpdateCallback, ConductorEvents } from './Conductor'
+export type { AcpClientCallbacks, AcpClientFactoryOptions } from './AcpClientFactory'