fix: Continue on fail / error output support for chains and agents (#9078)

packages/@n8n/nodes-langchain/nodes/agents/Agent/agents/ConversationalAgent/execute.ts

@@ -79,6 +79,7 @@ export async function conversationalAgentExecute(
 
 	const items = this.getInputData();
 	for (let itemIndex = 0; itemIndex < items.length; itemIndex++) {
+		try {
 			let input;
 
 			if (this.getNode().typeVersion <= 1.2) {
@@ -109,6 +110,14 @@ export async function conversationalAgentExecute(
 			}
 
 			returnData.push({ json: response });
+		} catch (error) {
+			if (this.continueOnFail()) {
+				returnData.push({ json: { error: error.message }, pairedItem: { item: itemIndex } });
+				continue;
+			}
+
+			throw error;
+		}
 	}
 
 	return await this.prepareOutputData(returnData);

packages/@n8n/nodes-langchain/nodes/agents/Agent/agents/OpenAiFunctionsAgent/execute.ts

@@ -85,6 +85,7 @@ export async function openAiFunctionsAgentExecute(
 
 	const items = this.getInputData();
 	for (let itemIndex = 0; itemIndex < items.length; itemIndex++) {
+		try {
 			let input;
 			if (this.getNode().typeVersion <= 1.2) {
 				input = this.getNodeParameter('text', itemIndex) as string;
@@ -114,6 +115,14 @@ export async function openAiFunctionsAgentExecute(
 			}
 
 			returnData.push({ json: response });
+		} catch (error) {
+			if (this.continueOnFail()) {
+				returnData.push({ json: { error: error.message }, pairedItem: { item: itemIndex } });
+				continue;
+			}
+
+			throw error;
+		}
 	}
 
 	return await this.prepareOutputData(returnData);

packages/@n8n/nodes-langchain/nodes/agents/Agent/agents/PlanAndExecuteAgent/execute.ts

@@ -60,6 +60,7 @@ export async function planAndExecuteAgentExecute(
 
 	const items = this.getInputData();
 	for (let itemIndex = 0; itemIndex < items.length; itemIndex++) {
+		try {
 			let input;
 			if (this.getNode().typeVersion <= 1.2) {
 				input = this.getNodeParameter('text', itemIndex) as string;
@@ -89,6 +90,14 @@ export async function planAndExecuteAgentExecute(
 			}
 
 			returnData.push({ json: response });
+		} catch (error) {
+			if (this.continueOnFail()) {
+				returnData.push({ json: { error: error.message }, pairedItem: { item: itemIndex } });
+				continue;
+			}
+
+			throw error;
+		}
 	}
 
 	return await this.prepareOutputData(returnData);

packages/@n8n/nodes-langchain/nodes/agents/Agent/agents/ReActAgent/execute.ts

@@ -80,6 +80,7 @@ export async function reActAgentAgentExecute(
 
 	const items = this.getInputData();
 	for (let itemIndex = 0; itemIndex < items.length; itemIndex++) {
+		try {
 			let input;
 
 			if (this.getNode().typeVersion <= 1.2) {
@@ -110,6 +111,14 @@ export async function reActAgentAgentExecute(
 			}
 
 			returnData.push({ json: response });
+		} catch (error) {
+			if (this.continueOnFail()) {
+				returnData.push({ json: { error: error.message }, pairedItem: { item: itemIndex } });
+				continue;
+			}
+
+			throw error;
+		}
 	}
 
 	return await this.prepareOutputData(returnData);

packages/@n8n/nodes-langchain/nodes/agents/Agent/agents/SqlAgent/execute.ts

@@ -41,6 +41,7 @@ export async function sqlAgentAgentExecute(
 	const returnData: INodeExecutionData[] = [];
 
 	for (let i = 0; i < items.length; i++) {
+		try {
 			const item = items[i];
 			let input;
 			if (this.getNode().typeVersion <= 1.2) {
@@ -141,6 +142,14 @@ export async function sqlAgentAgentExecute(
 			}
 
 			returnData.push({ json: response });
+		} catch (error) {
+			if (this.continueOnFail()) {
+				returnData.push({ json: { error: error.message }, pairedItem: { item: i } });
+				continue;
+			}
+
+			throw error;
+		}
 	}
 
 	return await this.prepareOutputData(returnData);

packages/@n8n/nodes-langchain/nodes/agents/OpenAiAssistant/OpenAiAssistant.node.ts

@@ -320,6 +320,7 @@ export class OpenAiAssistant implements INodeType {
 		const returnData: INodeExecutionData[] = [];
 
 		for (let itemIndex = 0; itemIndex < items.length; itemIndex++) {
+			try {
 				const input = this.getNodeParameter('text', itemIndex) as string;
 				const assistantId = this.getNodeParameter('assistantId', itemIndex, '') as string;
 				const nativeTools = this.getNodeParameter('nativeTools', itemIndex, []) as Array<
@@ -381,6 +382,14 @@ export class OpenAiAssistant implements INodeType {
 				});
 
 				returnData.push({ json: response });
+			} catch (error) {
+				if (this.continueOnFail()) {
+					returnData.push({ json: { error: error.message }, pairedItem: { item: itemIndex } });
+					continue;
+				}
+
+				throw error;
+			}
 		}
 
 		return await this.prepareOutputData(returnData);

packages/@n8n/nodes-langchain/nodes/chains/ChainLLM/ChainLlm.node.ts

@@ -519,6 +519,7 @@ export class ChainLlm implements INodeType {
 		const outputParsers = await getOptionalOutputParsers(this);
 
 		for (let itemIndex = 0; itemIndex < items.length; itemIndex++) {
+			try {
 				let prompt: string;
 				if (this.getNode().typeVersion <= 1.3) {
 					prompt = this.getNodeParameter('prompt', itemIndex) as string;
@@ -537,7 +538,7 @@ export class ChainLlm implements INodeType {
 				) as MessagesTemplate[];
 
 				if (prompt === undefined) {
-				throw new NodeOperationError(this.getNode(), 'The ‘prompt’ parameter is empty.');
+					throw new NodeOperationError(this.getNode(), "The 'prompt' parameter is empty.");
 				}
 
 				const responses = await getChain(this, itemIndex, prompt, llm, outputParsers, messages);
@@ -568,6 +569,14 @@ export class ChainLlm implements INodeType {
 						json: data,
 					});
 				});
+			} catch (error) {
+				if (this.continueOnFail()) {
+					returnData.push({ json: { error: error.message }, pairedItem: { item: itemIndex } });
+					continue;
+				}
+
+				throw error;
+			}
 		}
 
 		return [returnData];

packages/@n8n/nodes-langchain/nodes/chains/ChainRetrievalQA/ChainRetrievalQa.node.ts

@@ -160,6 +160,7 @@ export class ChainRetrievalQa implements INodeType {
 
 		// Run for each item
 		for (let itemIndex = 0; itemIndex < items.length; itemIndex++) {
+			try {
 				let query;
 
 				if (this.getNode().typeVersion <= 1.2) {
@@ -179,6 +180,14 @@ export class ChainRetrievalQa implements INodeType {
 
 				const response = await chain.withConfig(getTracingConfig(this)).invoke({ query });
 				returnData.push({ json: { response } });
+			} catch (error) {
+				if (this.continueOnFail()) {
+					returnData.push({ json: { error: error.message }, pairedItem: { item: itemIndex } });
+					continue;
+				}
+
+				throw error;
+			}
 		}
 		return await this.prepareOutputData(returnData);
 	}

packages/@n8n/nodes-langchain/nodes/chains/ChainSummarization/V2/ChainSummarizationV2.node.ts

@@ -329,6 +329,7 @@ export class ChainSummarizationV2 implements INodeType {
 		const returnData: INodeExecutionData[] = [];
 
 		for (let itemIndex = 0; itemIndex < items.length; itemIndex++) {
+			try {
 				const summarizationMethodAndPrompts = this.getNodeParameter(
 					'options.summarizationMethodAndPrompts.values',
 					itemIndex,
@@ -414,6 +415,14 @@ export class ChainSummarizationV2 implements INodeType {
 					});
 					returnData.push({ json: { response } });
 				}
+			} catch (error) {
+				if (this.continueOnFail()) {
+					returnData.push({ json: { error: error.message }, pairedItem: { item: itemIndex } });
+					continue;
+				}
+
+				throw error;
+			}
 		}
 
 		return await this.prepareOutputData(returnData);