fix(acp): resolve agent mode disconnect and improve mode awareness (#26332)

packages/core/src/utils/events.ts

@@ -14,6 +14,7 @@ import type {
   KeychainAvailabilityEvent,
 } from '../telemetry/types.js';
 import { debugLogger } from './debugLogger.js';
+import type { ApprovalMode } from '../policy/types.js';
 
 /**
  * Defines the severity level for user-facing feedback.
@@ -52,6 +53,20 @@ export interface ModelChangedPayload {
   model: string;
 }
 
+/**
+ * Payload for the 'approval-mode-changed' event.
+ */
+export interface ApprovalModeChangedPayload {
+  /**
+   * The session ID associated with the mode change.
+   */
+  sessionId: string;
+  /**
+   * The new approval mode.
+   */
+  mode: ApprovalMode;
+}
+
 /**
  * Payload for the 'console-log' event.
  */
@@ -181,6 +196,7 @@ export interface QuotaChangedPayload {
 export enum CoreEvent {
   UserFeedback = 'user-feedback',
   ModelChanged = 'model-changed',
+  ApprovalModeChanged = 'approval-mode-changed',
   ConsoleLog = 'console-log',
   Output = 'output',
   MemoryChanged = 'memory-changed',
@@ -215,6 +231,7 @@ export interface EditorSelectedPayload {
 export interface CoreEvents extends ExtensionEvents {
   [CoreEvent.UserFeedback]: [UserFeedbackPayload];
   [CoreEvent.ModelChanged]: [ModelChangedPayload];
+  [CoreEvent.ApprovalModeChanged]: [ApprovalModeChangedPayload];
   [CoreEvent.ConsoleLog]: [ConsoleLogPayload];
   [CoreEvent.Output]: [OutputPayload];
   [CoreEvent.MemoryChanged]: [MemoryChangedPayload];
@@ -327,6 +344,14 @@ export class CoreEventEmitter extends EventEmitter<CoreEvents> {
     this.emit(CoreEvent.ModelChanged, payload);
   }
 
+  /**
+   * Notifies subscribers that the approval mode has changed.
+   */
+  emitApprovalModeChanged(sessionId: string, mode: ApprovalMode): void {
+    const payload: ApprovalModeChangedPayload = { sessionId, mode };
+    this.emit(CoreEvent.ApprovalModeChanged, payload);
+  }
+
   /**
    * Notifies subscribers that settings have been modified.
    */