feat(AI Agent Node): Implement streaming on AI agent node (no-changelog) (#16897)

packages/core/src/execution-engine/node-execution-context/execute-context.ts

@@ -131,6 +131,21 @@ export class ExecuteContext extends BaseExecuteContext implements IExecuteFuncti
 			)) as IExecuteFunctions['getNodeParameter'];
 	}
 
+	isStreaming(): boolean {
+		// Check if we have sendChunk handlers
+		const handlers = this.additionalData.hooks?.handlers?.sendChunk?.length;
+		const hasHandlers = handlers !== undefined && handlers > 0;
+
+		// Check if streaming was enabled for this execution
+		const streamingEnabled = this.additionalData.streamingEnabled === true;
+
+		// Check current execution mode supports streaming
+		const executionModeSupportsStreaming = ['manual', 'webhook', 'integrated'];
+		const isStreamingMode = executionModeSupportsStreaming.includes(this.mode);
+
+		return hasHandlers && isStreamingMode && streamingEnabled;
+	}
+
 	async sendChunk(type: ChunkType, content?: IDataObject | string): Promise<void> {
 		const node = this.getNode();
 		const metadata = {
@@ -139,9 +154,11 @@ export class ExecuteContext extends BaseExecuteContext implements IExecuteFuncti
 			timestamp: Date.now(),
 		};
 
+		const parsedContent = typeof content === 'string' ? content : JSON.stringify(content);
+
 		const message: StructuredChunk = {
 			type,
-			content: content ? JSON.stringify(content) : undefined,
+			content: parsedContent,
 			metadata,
 		};