fix(core): Use manual tool description if neither resources or operations exist (#15093)

packages/core/src/execution-engine/node-execution-context/utils/__tests__/create-node-as-tool.test.ts

@@ -68,6 +68,15 @@ describe('createNodeAsTool', () => {
 
 			expect(tool.description).toBe('Custom tool description');
 		});
+
+		it('should use toolDescription when descriptionType is absent', () => {
+			delete node.parameters.descriptionType;
+			node.parameters.toolDescription = 'Another custom tool description';
+
+			const tool = createNodeAsTool(options).response;
+
+			expect(tool.description).toBe('Another custom tool description');
+		});
 	});
 
 	describe('Schema Creation and Parameter Handling', () => {

packages/core/src/execution-engine/node-execution-context/utils/create-node-as-tool.ts

@@ -90,8 +90,6 @@ function getSchema(node: INode) {
  * @returns A string description for the node.
  */
 function makeDescription(node: INode, nodeType: INodeType): string {
-	const manualDescription = node.parameters.toolDescription as string;
-
 	if (node.parameters.descriptionType === 'auto') {
 		const resource = node.parameters.resource as string;
 		const operation = node.parameters.operation as string;
@@ -104,11 +102,10 @@ function makeDescription(node: INode, nodeType: INodeType): string {
 		}
 		return description.trim();
 	}
-	if (node.parameters.descriptionType === 'manual') {
-		return manualDescription ?? nodeType.description.description;
-	}
 
-	return nodeType.description.description;
+	// Users can define custom descriptions when `descriptionType` is manual or not included
+	// in the node's properties, e.g. when the node has neither `operation` or `resource`
+	return (node.parameters.toolDescription as string) ?? nodeType.description.description;
 }
 
 export function nodeNameToToolName(node: INode): string {