fix(AI Agent Node): Fix tools agent when using memory and Anthropic models

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

@@ -96,6 +96,59 @@ export async function toolsAgentExecute(this: IExecuteFunctions): Promise<INodeE
 	/**
 	 * Handles the agent text output and transforms it in case of multi-output.
 	 *
+	 * This method is necessary to handle different output formats from various language models.
+	 * Specifically, it checks if the agent step is the final step (contains returnValues) and determines
+	 * if the output is a simple string (e.g., from OpenAI models) or an array of outputs (e.g., from Anthropic models).
+	 *
+	 * If the output is an array of text outputs, this method will concatenate them into a single string,
+	 * ensuring compatibility with downstream processes that expect a single output string.
+	 *
+	 * Examples:
+	 * 1. Anthropic model output:
+	 *    {
+	 *      "output": [
+	 *        {
+	 *          "index": 0,
+	 *          "type": "text",
+	 *          "text": "The result of the calculation is approximately 1001.8166..."
+	 *        }
+	 *      ]
+	 *    }
+	 *
+	 * 2. OpenAI model output:
+	 *    {
+	 *      "output": "The result of the calculation is approximately 1001.82..."
+	 *    }
+	 *
+	 * This method ensures consistent handling of outputs regardless of the model used,
+	 * providing a unified output format for further processing.
+	 *
+	 * This method is necessary to handle different output formats from various language models.
+	 * Specifically, it checks if the agent step is the final step (contains returnValues) and determines
+	 * if the output is a simple string (e.g., from OpenAI models) or an array of outputs (e.g., from Anthropic models).
+	 *
+	 * Examples:
+	 * 1. Anthropic model output:
+	 * ```json
+	 *    {
+	 *      "output": [
+	 *        {
+	 *          "index": 0,
+	 *          "type": "text",
+	 *          "text": "The result of the calculation is approximately 1001.8166..."
+	 *        }
+	 *      ]
+	 *    }
+	 *```
+	 * 2. OpenAI model output:
+	 * ```json
+	 *    {
+	 *      "output": "The result of the calculation is approximately 1001.82..."
+	 *    }
+	 * ```
+	 *
+	 * This method ensures consistent handling of outputs regardless of the model used.
+	 *
 	 * @param steps - The agent finish or agent action steps.
 	 * @returns The modified agent finish steps or the original steps.
 	 */
@@ -108,13 +161,14 @@ export async function toolsAgentExecute(this: IExecuteFunctions): Promise<INodeE
 
 		if (agentFinishSteps.returnValues) {
 			const isMultiOutput = Array.isArray(agentFinishSteps.returnValues?.output);
+
 			if (isMultiOutput) {
 				// Define the type for each item in the multi-output array
 				type MultiOutputItem = { index: number; type: string; text: string };
 				const multiOutputSteps = agentFinishSteps.returnValues.output as MultiOutputItem[];
 
 				// Check if all items in the multi-output array are of type 'text'
-				const isTextOnly = (multiOutputSteps ?? []).every((output) => output.type === 'text');
+				const isTextOnly = (multiOutputSteps ?? []).every((output) => 'text' in output);
 
 				if (isTextOnly) {
 					// If all items are of type 'text', merge them into a single string
@@ -128,7 +182,7 @@ export async function toolsAgentExecute(this: IExecuteFunctions): Promise<INodeE
 		}
 
 		// If the steps do not contain multiple outputs, return them as is
-		return steps;
+		return agentFinishSteps;
 	}
 	async function agentStepsParser(
 		steps: AgentFinish | AgentAction[],

packages/@n8n/nodes-langchain/nodes/embeddings/EmbeddingsOllama/EmbeddingsOllama.node.ts

@@ -6,7 +6,7 @@ import {
 	type INodeTypeDescription,
 	type SupplyData,
 } from 'n8n-workflow';
-import { OllamaEmbeddings } from '@langchain/ollama';
+import { OllamaEmbeddings } from '@langchain/community/embeddings/ollama';
 import { logWrapper } from '../../../utils/logWrapper';
 import { getConnectionHintNoticeField } from '../../../utils/sharedFields';
 import { ollamaDescription, ollamaModel } from '../../llms/LMOllama/description';

packages/@n8n/nodes-langchain/package.json

@@ -137,17 +137,17 @@
     "@google-cloud/resource-manager": "5.3.0",
     "@google/generative-ai": "0.11.4",
     "@huggingface/inference": "2.7.0",
-    "@langchain/anthropic": "0.2.15",
+    "@langchain/anthropic": "0.2.9",
     "@langchain/cohere": "0.0.10",
-    "@langchain/community": "0.2.28",
-    "@langchain/core": "0.2.27",
-    "@langchain/google-genai": "0.0.26",
-    "@langchain/google-vertexai": "0.0.26",
-    "@langchain/groq": "0.0.17",
-    "@langchain/mistralai": "0.0.28",
-    "@langchain/ollama": "^0.0.4",
-    "@langchain/openai": "0.2.7",
-    "@langchain/pinecone": "0.0.9",
+    "@langchain/community": "0.2.20",
+    "@langchain/core": "0.2.18",
+    "@langchain/google-genai": "0.0.23",
+    "@langchain/google-vertexai": "0.0.21",
+    "@langchain/groq": "0.0.15",
+    "@langchain/mistralai": "0.0.27",
+    "@langchain/ollama": "^0.0.2",
+    "@langchain/openai": "0.2.5",
+    "@langchain/pinecone": "0.0.8",
     "@langchain/qdrant": "^0.0.5",
     "@langchain/redis": "0.0.5",
     "@langchain/textsplitters": "0.0.3",
@@ -156,7 +156,7 @@
     "@n8n/vm2": "3.9.25",
     "@pinecone-database/pinecone": "3.0.0",
     "@qdrant/js-client-rest": "1.9.0",
-    "@supabase/supabase-js": "2.45.1",
+    "@supabase/supabase-js": "2.43.4",
     "@types/pg": "^8.11.6",
     "@xata.io/client": "0.28.4",
     "basic-auth": "catalog:",
@@ -169,12 +169,12 @@
     "html-to-text": "9.0.5",
     "jsdom": "^23.0.1",
     "json-schema-to-zod": "2.1.0",
-    "langchain": "0.2.16",
+    "langchain": "0.2.11",
     "lodash": "catalog:",
     "mammoth": "1.7.2",
     "n8n-nodes-base": "workspace:*",
     "n8n-workflow": "workspace:*",
-    "openai": "4.56.0",
+    "openai": "4.53.0",
     "pdf-parse": "1.1.1",
     "pg": "8.12.0",
     "redis": "4.6.12",

packages/workflow/package.json

@@ -29,7 +29,7 @@
     "dist/**/*"
   ],
   "devDependencies": {
-    "@langchain/core": "^0.2.27",
+    "@langchain/core": "^0.2.18",
     "@types/deep-equal": "^1.0.1",
     "@types/express": "catalog:",
     "@types/jmespath": "^0.15.0",