feat(editor): Improve how we show default Agent prompt and Memory session parameters (#11491)

packages/@n8n/nodes-langchain/nodes/memory/MemoryBufferWindow/MemoryBufferWindow.node.ts

@@ -1,4 +1,6 @@
 /* eslint-disable n8n-nodes-base/node-dirname-against-convention */
+import type { BufferWindowMemoryInput } from 'langchain/memory';
+import { BufferWindowMemory } from 'langchain/memory';
 import {
 	NodeConnectionType,
 	type INodeType,
@@ -6,12 +8,16 @@ import {
 	type ISupplyDataFunctions,
 	type SupplyData,
 } from 'n8n-workflow';
-import type { BufferWindowMemoryInput } from 'langchain/memory';
-import { BufferWindowMemory } from 'langchain/memory';
+
+import { getSessionId } from '../../../utils/helpers';
 import { logWrapper } from '../../../utils/logWrapper';
 import { getConnectionHintNoticeField } from '../../../utils/sharedFields';
-import { sessionIdOption, sessionKeyProperty, contextWindowLengthProperty } from '../descriptions';
-import { getSessionId } from '../../../utils/helpers';
+import {
+	sessionIdOption,
+	sessionKeyProperty,
+	contextWindowLengthProperty,
+	expressionSessionKeyProperty,
+} from '../descriptions';
 
 class MemoryChatBufferSingleton {
 	private static instance: MemoryChatBufferSingleton;
@@ -72,7 +78,7 @@ export class MemoryBufferWindow implements INodeType {
 		name: 'memoryBufferWindow',
 		icon: 'fa:database',
 		group: ['transform'],
-		version: [1, 1.1, 1.2],
+		version: [1, 1.1, 1.2, 1.3],
 		description: 'Stores in n8n memory, so no credentials required',
 		defaults: {
 			name: 'Window Buffer Memory',
@@ -129,6 +135,7 @@ export class MemoryBufferWindow implements INodeType {
 					},
 				},
 			},
+			expressionSessionKeyProperty(1.3),
 			sessionKeyProperty,
 			contextWindowLengthProperty,
 		],

packages/@n8n/nodes-langchain/nodes/memory/MemoryMotorhead/MemoryMotorhead.node.ts

@@ -1,4 +1,5 @@
 /* eslint-disable n8n-nodes-base/node-dirname-against-convention */
+import { MotorheadMemory } from '@langchain/community/memory/motorhead_memory';
 import {
 	NodeConnectionType,
 	type INodeType,
@@ -7,11 +8,10 @@ import {
 	type SupplyData,
 } from 'n8n-workflow';
 
-import { MotorheadMemory } from '@langchain/community/memory/motorhead_memory';
+import { getSessionId } from '../../../utils/helpers';
 import { logWrapper } from '../../../utils/logWrapper';
 import { getConnectionHintNoticeField } from '../../../utils/sharedFields';
-import { sessionIdOption, sessionKeyProperty } from '../descriptions';
-import { getSessionId } from '../../../utils/helpers';
+import { expressionSessionKeyProperty, sessionIdOption, sessionKeyProperty } from '../descriptions';
 
 export class MemoryMotorhead implements INodeType {
 	description: INodeTypeDescription = {
@@ -19,7 +19,7 @@ export class MemoryMotorhead implements INodeType {
 		name: 'memoryMotorhead',
 		icon: 'fa:file-export',
 		group: ['transform'],
-		version: [1, 1.1, 1.2],
+		version: [1, 1.1, 1.2, 1.3],
 		description: 'Use Motorhead Memory',
 		defaults: {
 			name: 'Motorhead',
@@ -82,6 +82,7 @@ export class MemoryMotorhead implements INodeType {
 					},
 				},
 			},
+			expressionSessionKeyProperty(1.3),
 			sessionKeyProperty,
 		],
 	};

packages/@n8n/nodes-langchain/nodes/memory/MemoryPostgresChat/MemoryPostgresChat.node.ts

@@ -1,4 +1,9 @@
 /* eslint-disable n8n-nodes-base/node-dirname-against-convention */
+import { PostgresChatMessageHistory } from '@langchain/community/stores/message/postgres';
+import { BufferMemory, BufferWindowMemory } from 'langchain/memory';
+import type { PostgresNodeCredentials } from 'n8n-nodes-base/dist/nodes/Postgres/v2/helpers/interfaces';
+import { postgresConnectionTest } from 'n8n-nodes-base/dist/nodes/Postgres/v2/methods/credentialTest';
+import { configurePostgres } from 'n8n-nodes-base/dist/nodes/Postgres/v2/transport';
 import type {
 	ISupplyDataFunctions,
 	INodeType,
@@ -6,16 +11,17 @@ import type {
 	SupplyData,
 } from 'n8n-workflow';
 import { NodeConnectionType } from 'n8n-workflow';
-import { BufferMemory, BufferWindowMemory } from 'langchain/memory';
-import { PostgresChatMessageHistory } from '@langchain/community/stores/message/postgres';
 import type pg from 'pg';
-import { configurePostgres } from 'n8n-nodes-base/dist/nodes/Postgres/v2/transport';
-import type { PostgresNodeCredentials } from 'n8n-nodes-base/dist/nodes/Postgres/v2/helpers/interfaces';
-import { postgresConnectionTest } from 'n8n-nodes-base/dist/nodes/Postgres/v2/methods/credentialTest';
+
+import { getSessionId } from '../../../utils/helpers';
 import { logWrapper } from '../../../utils/logWrapper';
 import { getConnectionHintNoticeField } from '../../../utils/sharedFields';
-import { sessionIdOption, sessionKeyProperty, contextWindowLengthProperty } from '../descriptions';
-import { getSessionId } from '../../../utils/helpers';
+import {
+	sessionIdOption,
+	sessionKeyProperty,
+	contextWindowLengthProperty,
+	expressionSessionKeyProperty,
+} from '../descriptions';
 
 export class MemoryPostgresChat implements INodeType {
 	description: INodeTypeDescription = {
@@ -23,7 +29,7 @@ export class MemoryPostgresChat implements INodeType {
 		name: 'memoryPostgresChat',
 		icon: 'file:postgres.svg',
 		group: ['transform'],
-		version: [1, 1.1],
+		version: [1, 1.1, 1.2, 1.3],
 		description: 'Stores the chat history in Postgres table.',
 		defaults: {
 			name: 'Postgres Chat Memory',
@@ -56,6 +62,7 @@ export class MemoryPostgresChat implements INodeType {
 		properties: [
 			getConnectionHintNoticeField([NodeConnectionType.AiAgent]),
 			sessionIdOption,
+			expressionSessionKeyProperty(1.2),
 			sessionKeyProperty,
 			{
 				displayName: 'Table Name',

packages/@n8n/nodes-langchain/nodes/memory/MemoryRedisChat/MemoryRedisChat.node.ts

@@ -1,4 +1,7 @@
 /* eslint-disable n8n-nodes-base/node-dirname-against-convention */
+import type { RedisChatMessageHistoryInput } from '@langchain/redis';
+import { RedisChatMessageHistory } from '@langchain/redis';
+import { BufferMemory, BufferWindowMemory } from 'langchain/memory';
 import {
 	NodeOperationError,
 	type INodeType,
@@ -7,15 +10,18 @@ import {
 	type SupplyData,
 	NodeConnectionType,
 } from 'n8n-workflow';
-import { BufferMemory, BufferWindowMemory } from 'langchain/memory';
-import type { RedisChatMessageHistoryInput } from '@langchain/redis';
-import { RedisChatMessageHistory } from '@langchain/redis';
 import type { RedisClientOptions } from 'redis';
 import { createClient } from 'redis';
+
+import { getSessionId } from '../../../utils/helpers';
 import { logWrapper } from '../../../utils/logWrapper';
 import { getConnectionHintNoticeField } from '../../../utils/sharedFields';
-import { sessionIdOption, sessionKeyProperty, contextWindowLengthProperty } from '../descriptions';
-import { getSessionId } from '../../../utils/helpers';
+import {
+	sessionIdOption,
+	sessionKeyProperty,
+	contextWindowLengthProperty,
+	expressionSessionKeyProperty,
+} from '../descriptions';
 
 export class MemoryRedisChat implements INodeType {
 	description: INodeTypeDescription = {
@@ -23,7 +29,7 @@ export class MemoryRedisChat implements INodeType {
 		name: 'memoryRedisChat',
 		icon: 'file:redis.svg',
 		group: ['transform'],
-		version: [1, 1.1, 1.2, 1.3],
+		version: [1, 1.1, 1.2, 1.3, 1.4],
 		description: 'Stores the chat history in Redis.',
 		defaults: {
 			name: 'Redis Chat Memory',
@@ -86,6 +92,7 @@ export class MemoryRedisChat implements INodeType {
 					},
 				},
 			},
+			expressionSessionKeyProperty(1.4),
 			sessionKeyProperty,
 			{
 				displayName: 'Session Time To Live',

packages/@n8n/nodes-langchain/nodes/memory/MemoryXata/MemoryXata.node.ts

@@ -1,4 +1,7 @@
 /* eslint-disable n8n-nodes-base/node-dirname-against-convention */
+import { XataChatMessageHistory } from '@langchain/community/stores/message/xata';
+import { BaseClient } from '@xata.io/client';
+import { BufferMemory, BufferWindowMemory } from 'langchain/memory';
 import { NodeConnectionType, NodeOperationError } from 'n8n-workflow';
 import type {
 	ISupplyDataFunctions,
@@ -6,13 +9,16 @@ import type {
 	INodeTypeDescription,
 	SupplyData,
 } from 'n8n-workflow';
-import { XataChatMessageHistory } from '@langchain/community/stores/message/xata';
-import { BufferMemory, BufferWindowMemory } from 'langchain/memory';
-import { BaseClient } from '@xata.io/client';
+
+import { getSessionId } from '../../../utils/helpers';
 import { logWrapper } from '../../../utils/logWrapper';
 import { getConnectionHintNoticeField } from '../../../utils/sharedFields';
-import { sessionIdOption, sessionKeyProperty, contextWindowLengthProperty } from '../descriptions';
-import { getSessionId } from '../../../utils/helpers';
+import {
+	sessionIdOption,
+	sessionKeyProperty,
+	contextWindowLengthProperty,
+	expressionSessionKeyProperty,
+} from '../descriptions';
 
 export class MemoryXata implements INodeType {
 	description: INodeTypeDescription = {
@@ -20,7 +26,7 @@ export class MemoryXata implements INodeType {
 		name: 'memoryXata',
 		icon: 'file:xata.svg',
 		group: ['transform'],
-		version: [1, 1.1, 1.2, 1.3],
+		version: [1, 1.1, 1.2, 1.3, 1.4],
 		description: 'Use Xata Memory',
 		defaults: {
 			name: 'Xata',
@@ -86,6 +92,7 @@ export class MemoryXata implements INodeType {
 				},
 			},
 			sessionKeyProperty,
+			expressionSessionKeyProperty(1.4),
 			{
 				...contextWindowLengthProperty,
 				displayOptions: { hide: { '@version': [{ _cnd: { lt: 1.3 } }] } },

packages/@n8n/nodes-langchain/nodes/memory/MemoryZep/MemoryZep.node.ts

@@ -12,7 +12,7 @@ import { ZepCloudMemory } from '@langchain/community/memory/zep_cloud';
 
 import { logWrapper } from '../../../utils/logWrapper';
 import { getConnectionHintNoticeField } from '../../../utils/sharedFields';
-import { sessionIdOption, sessionKeyProperty } from '../descriptions';
+import { expressionSessionKeyProperty, sessionIdOption, sessionKeyProperty } from '../descriptions';
 import { getSessionId } from '../../../utils/helpers';
 import type { BaseChatMemory } from '@langchain/community/dist/memory/chat_memory';
 import type { InputValues, MemoryVariables } from '@langchain/core/memory';
@@ -36,7 +36,7 @@ export class MemoryZep implements INodeType {
 		// eslint-disable-next-line n8n-nodes-base/node-class-description-icon-not-svg
 		icon: 'file:zep.png',
 		group: ['transform'],
-		version: [1, 1.1, 1.2],
+		version: [1, 1.1, 1.2, 1.3],
 		description: 'Use Zep Memory',
 		defaults: {
 			name: 'Zep',
@@ -99,6 +99,7 @@ export class MemoryZep implements INodeType {
 					},
 				},
 			},
+			expressionSessionKeyProperty(1.3),
 			sessionKeyProperty,
 		],
 	};

packages/@n8n/nodes-langchain/nodes/memory/descriptions.ts

@@ -21,6 +21,20 @@ export const sessionIdOption: INodeProperties = {
 	default: 'fromInput',
 };
 
+export const expressionSessionKeyProperty = (fromVersion: number): INodeProperties => ({
+	displayName: 'Session Key From Previous Node',
+	name: 'sessionKey',
+	type: 'string',
+	default: '={{ $json.sessionId }}',
+	disabledOptions: { show: { sessionIdType: ['fromInput'] } },
+	displayOptions: {
+		show: {
+			sessionIdType: ['fromInput'],
+			'@version': [{ _cnd: { gte: fromVersion } }],
+		},
+	},
+});
+
 export const sessionKeyProperty: INodeProperties = {
 	displayName: 'Key',
 	name: 'sessionKey',