feat(MCP Server Trigger Node): Add MCP Server Trigger node to expose tools to MCP clients (#14403)

Co-authored-by: कारतोफ्फेलस्क्रिप्ट™ <aditya@netroy.in>

packages/cli/src/webhooks/webhook-helpers.ts

@@ -48,6 +48,7 @@ import { finished } from 'stream/promises';
 
 import { ActiveExecutions } from '@/active-executions';
 import config from '@/config';
+import { MCP_TRIGGER_NODE_TYPE } from '@/constants';
 import type { Project } from '@/databases/entities/project';
 import { InternalServerError } from '@/errors/response-errors/internal-server.error';
 import { NotFoundError } from '@/errors/response-errors/not-found.error';
@@ -446,6 +447,32 @@ export async function executeWebhook(
 			}
 		}
 
+		// TODO: remove this hack, and make sure that execution data is properly created before the MCP trigger is executed
+		if (workflowStartNode.type === MCP_TRIGGER_NODE_TYPE) {
+			// Initialize the data of the webhook node
+			const nodeExecutionStack: IExecuteData[] = [];
+			nodeExecutionStack.push({
+				node: workflowStartNode,
+				data: {
+					main: [],
+				},
+				source: null,
+			});
+			runExecutionData =
+				runExecutionData ||
+				({
+					startData: {},
+					resultData: {
+						runData: {},
+					},
+					executionData: {
+						contextData: {},
+						nodeExecutionStack,
+						waitingExecution: {},
+					},
+				} as IRunExecutionData);
+		}
+
 		try {
 			webhookResultData = await Container.get(WebhookService).runWebhook(
 				workflow,