update

ts/smartagent.classes.driveragent.ts

@@ -2,6 +2,16 @@ import * as plugins from './plugins.js';
 import * as interfaces from './smartagent.interfaces.js';
 import type { BaseToolWrapper } from './smartagent.tools.base.js';
 
+/**
+ * Options for configuring the DriverAgent
+ */
+export interface IDriverAgentOptions {
+  /** Custom system message for the driver */
+  systemMessage?: string;
+  /** Maximum history messages to pass to API (default: 20). Set to 0 for unlimited. */
+  maxHistoryMessages?: number;
+}
+
 /**
  * DriverAgent - Executes tasks by reasoning and proposing tool calls
  * Works in conjunction with GuardianAgent for approval
@@ -9,15 +19,24 @@ import type { BaseToolWrapper } from './smartagent.tools.base.js';
 export class DriverAgent {
   private provider: plugins.smartai.MultiModalModel;
   private systemMessage: string;
+  private maxHistoryMessages: number;
   private messageHistory: plugins.smartai.ChatMessage[] = [];
   private tools: Map<string, BaseToolWrapper> = new Map();
 
   constructor(
     provider: plugins.smartai.MultiModalModel,
-    systemMessage?: string
+    options?: IDriverAgentOptions | string
   ) {
     this.provider = provider;
-    this.systemMessage = systemMessage || this.getDefaultSystemMessage();
+
+    // Support both legacy string systemMessage and new options object
+    if (typeof options === 'string') {
+      this.systemMessage = options || this.getDefaultSystemMessage();
+      this.maxHistoryMessages = 20;
+    } else {
+      this.systemMessage = options?.systemMessage || this.getDefaultSystemMessage();
+      this.maxHistoryMessages = options?.maxHistoryMessages ?? 20;
+    }
   }
 
   /**
@@ -105,8 +124,20 @@ export class DriverAgent {
       fullSystemMessage = this.getNoToolsSystemMessage();
     }
 
-    // Get response from provider (pass all but last user message as history)
-    const historyForChat = this.messageHistory.slice(0, -1);
+    // Get response from provider with history windowing
+    // Keep original task and most recent messages to avoid token explosion
+    let historyForChat: plugins.smartai.ChatMessage[];
+    const fullHistory = this.messageHistory.slice(0, -1); // Exclude the just-added message
+
+    if (this.maxHistoryMessages > 0 && fullHistory.length > this.maxHistoryMessages) {
+      // Keep the original task (first message) and most recent messages
+      historyForChat = [
+        fullHistory[0], // Original task
+        ...fullHistory.slice(-(this.maxHistoryMessages - 1)), // Recent messages
+      ];
+    } else {
+      historyForChat = fullHistory;
+    }
 
     const response = await this.provider.chat({
       systemMessage: fullSystemMessage,