fix(vscode-ide-companion): optimize stream termination handling and remove timeout for session_prompt

packages/vscode-ide-companion/src/services/acpSessionManager.ts

@@ -54,27 +54,31 @@ export class AcpSessionManager {
     };
 
     return new Promise((resolve, reject) => {
-      // different timeout durations based on methods
-      let timeoutDuration = 60000; // default 60 seconds
-      if (
-        method === AGENT_METHODS.session_prompt ||
-        method === AGENT_METHODS.initialize
-      ) {
-        timeoutDuration = 120000; // 2min for session_prompt and initialize
-      }
+      // No timeout for session_prompt as LLM tasks can take 5-10 minutes or longer
+      // The request should always terminate with a stop_reason
+      let timeoutId: NodeJS.Timeout | undefined;
+      let timeoutDuration: number | undefined;
 
-      const timeoutId = setTimeout(() => {
+      if (method !== AGENT_METHODS.session_prompt) {
+        // Set timeout for other methods
+        timeoutDuration = method === AGENT_METHODS.initialize ? 120000 : 60000;
+        timeoutId = setTimeout(() => {
           pendingRequests.delete(id);
           reject(new Error(`Request ${method} timed out`));
         }, timeoutDuration);
+      }
 
       const pendingRequest: PendingRequest<T> = {
         resolve: (value: T) => {
+          if (timeoutId) {
             clearTimeout(timeoutId);
+          }
           resolve(value);
         },
         reject: (error: Error) => {
+          if (timeoutId) {
             clearTimeout(timeoutId);
+          }
           reject(error);
         },
         timeoutId,

packages/vscode-ide-companion/src/webview/handlers/SessionMessageHandler.ts

@@ -440,24 +440,25 @@ export class SessionMessageHandler extends BaseMessageHandler {
         const isTimeoutError =
           lower.includes('timeout') || lower.includes('timed out');
         if (isTimeoutError) {
-          // Timeout has no action for the user to perform, so only reset the information in the panel and no VS Code error alert will pop up.
+          // Note: session_prompt no longer has a timeout, so this should rarely occur
+          // This path may still be hit for other methods (initialize, etc.) or network-level timeouts
           console.warn(
-            '[SessionMessageHandler] Prompt timed out; suppressing popup',
+            '[SessionMessageHandler] Request timed out; suppressing popup',
           );
 
           const timeoutMessage: ChatMessage = {
             role: 'assistant',
             content:
-              'Request timed out (no response within 120 seconds). Please try again or simplify the request.',
+              'Request timed out. This may be due to a network issue. Please try again.',
             timestamp: Date.now(),
           };
 
-          // Send a timeout message to the WebView without terminating the stream
-          // In this way, the long-term task can continue to receive subsequent messages after timeout.
+          // Send a timeout message to the WebView
           this.sendToWebView({
             type: 'message',
             data: timeoutMessage,
           });
+          this.sendStreamEnd('timeout');
         } else {
           // Handling of Non-Timeout Errors
           vscode.window.showErrorMessage(`Error sending message: ${error}`);