feat: Add option to returnIntermediateSteps for AI agents (#8113)

## Summary
![CleanShot 2023-12-21 at 08 30
16](https://github.com/n8n-io/n8n/assets/12657221/66b0de47-80cd-41f9-940e-6cacc2c940a9)

Signed-off-by: Oleg Ivaniv <me@olegivaniv.com>

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

@@ -67,6 +67,13 @@ export const conversationalAgentProperties: INodeProperties[] = [
 				default: 10,
 				description: 'The maximum number of iterations the agent will run before stopping',
 			},
+			{
+				displayName: 'Return Intermediate Steps',
+				name: 'returnIntermediateSteps',
+				type: 'boolean',
+				default: false,
+				description: 'Whether or not the output should include intermediate steps the agent took',
+			},
 		],
 	},
 ];

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

@@ -41,6 +41,7 @@ export async function conversationalAgentExecute(
 		systemMessage?: string;
 		humanMessage?: string;
 		maxIterations?: number;
+		returnIntermediateSteps?: boolean;
 	};
 
 	const agentExecutor = await initializeAgentExecutorWithOptions(tools, model, {
@@ -50,6 +51,7 @@ export async function conversationalAgentExecute(
 		// memory option, but the memoryKey set on it must be "chat_history".
 		agentType: 'chat-conversational-react-description',
 		memory,
+		returnIntermediateSteps: options?.returnIntermediateSteps === true,
 		maxIterations: options.maxIterations ?? 10,
 		agentArgs: {
 			systemMessage: options.systemMessage,

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

@@ -57,6 +57,13 @@ export const openAiFunctionsAgentProperties: INodeProperties[] = [
 				default: 10,
 				description: 'The maximum number of iterations the agent will run before stopping',
 			},
+			{
+				displayName: 'Return Intermediate Steps',
+				name: 'returnIntermediateSteps',
+				type: 'boolean',
+				default: false,
+				description: 'Whether or not the output should include intermediate steps the agent took',
+			},
 		],
 	},
 ];

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

@@ -40,6 +40,7 @@ export async function openAiFunctionsAgentExecute(
 	const options = this.getNodeParameter('options', 0, {}) as {
 		systemMessage?: string;
 		maxIterations?: number;
+		returnIntermediateSteps?: boolean;
 	};
 
 	const agentConfig: AgentExecutorInput = {
@@ -49,6 +50,7 @@ export async function openAiFunctionsAgentExecute(
 		}),
 		tools,
 		maxIterations: options.maxIterations ?? 10,
+		returnIntermediateSteps: options?.returnIntermediateSteps === true,
 		memory:
 			memory ??
 			new BufferMemory({

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

@@ -82,6 +82,13 @@ export const reActAgentAgentProperties: INodeProperties[] = [
 					rows: 6,
 				},
 			},
+			{
+				displayName: 'Return Intermediate Steps',
+				name: 'returnIntermediateSteps',
+				type: 'boolean',
+				default: false,
+				description: 'Whether or not the output should include intermediate steps the agent took',
+			},
 		],
 	},
 ];

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

@@ -34,6 +34,7 @@ export async function reActAgentAgentExecute(
 		suffix?: string;
 		suffixChat?: string;
 		humanMessageTemplate?: string;
+		returnIntermediateSteps?: boolean;
 	};
 	let agent: ChatAgent | ZeroShotAgent;
 
@@ -50,7 +51,11 @@ export async function reActAgentAgentExecute(
 		});
 	}
 
-	const agentExecutor = AgentExecutor.fromAgentAndTools({ agent, tools });
+	const agentExecutor = AgentExecutor.fromAgentAndTools({
+		agent,
+		tools,
+		returnIntermediateSteps: options?.returnIntermediateSteps === true,
+	});
 
 	const returnData: INodeExecutionData[] = [];
 

packages/@n8n/nodes-langchain/nodes/tools/ToolWikipedia/ToolWikipedia.node.ts

@@ -43,8 +43,13 @@ export class ToolWikipedia implements INodeType {
 	};
 
 	async supplyData(this: IExecuteFunctions): Promise<SupplyData> {
+		const WikiTool = new WikipediaQueryRun();
+
+		WikiTool.description =
+			'A tool for interacting with and fetching data from the Wikipedia API. The input should always be a string query.';
+
 		return {
-			response: logWrapper(new WikipediaQueryRun(), this),
+			response: logWrapper(WikiTool, this),
 		};
 	}
 }