Hi,
I’m testing a simple workflow using the editor chat UI:
When chat message received
↓
AI Agent
↓
OpenAI Chat Model
In the AI Agent node:
-
Source for Prompt: Define below
-
Prompt:
{{$json.chatInput}}
What happens:
-
Click Execute workflow
-
Send first message (
hello) -
AI Agent responds correctly
-
Send second message (
how are you) -
AI Agent fails with:
No prompt specified
Inspecting the node shows the input is:
[ {} ]
so chatInput is missing.
Strangely, if I deactivate and reactivate the nodes, the workflow works again for one message, but then fails again on the next message.
So effectively the workflow only works once per node reset.
Has anyone seen this behaviour with Chat Trigger + AI Agent in editor test mode? Is there something I’m missing, or could this be an editor session issue? Please help as I am feel that I am loosing my mind after four days of seemingly
trying everything!!
workflow code below:
{
“name”: “My workflow”,
“nodes”: [
{
“parameters”: {
“pollTimes”: {
“item”: [
{
“mode”: “everyMinute”
}
]
},
“triggerOn”: “specificFolder”,
“folderToWatch”: {
“__rl”: true,
“value”: “1nSmFTttv7ml1G1ImHb2ZfOSUeTj1MpeQ”,
“mode”: “list”,
“cachedResultName”: “n8n_demo”,
“cachedResultUrl”: “https://drive.google.com/drive/folders/1nSmFTttv7ml1G1ImHb2ZfOSUeTj1MpeQ”
},
“event”: “fileCreated”,
“options”: {}
},
“type”: “n8n-nodes-base.googleDriveTrigger”,
“typeVersion”: 1,
“position”: [
-1504,
-256
],
“id”: “e1644b5c-ced1-48bd-8d1c-876fde82bf1e”,
“name”: “Google Drive Trigger”,
“credentials”: {
“googleDriveOAuth2Api”: {
“id”: “BDdaqU7W1KtXkQ2z”,
“name”: “Google Drive OAuth2 API”
}
}
},
{
“parameters”: {
“operation”: “download”,
“fileId”: {
“__rl”: true,
“value”: “={{ $json.id }}”,
“mode”: “id”
},
“options”: {}
},
“type”: “n8n-nodes-base.googleDrive”,
“typeVersion”: 3,
“position”: [
-1312,
-256
],
“id”: “9c9153ed-188f-4774-995c-5ae95530c59f”,
“name”: “Download file”,
“credentials”: {
“googleDriveOAuth2Api”: {
“id”: “BDdaqU7W1KtXkQ2z”,
“name”: “Google Drive OAuth2 API”
}
}
},
{
“parameters”: {
“mode”: “insert”,
“pineconeIndex”: {
“__rl”: true,
“value”: “demo4”,
“mode”: “list”,
“cachedResultName”: “demo4”
},
“options”: {
“pineconeNamespace”: “FAQ”
}
},
“type”: “@n8n/n8n-nodes-langchain.vectorStorePinecone”,
“typeVersion”: 1.3,
“position”: [
-1104,
-256
],
“id”: “3e26a8d5-b23a-4041-9d4b-e73bd88a02c1”,
“name”: “Pinecone Vector Store”,
“credentials”: {
“pineconeApi”: {
“id”: “znnSRT2QGe3OvBAr”,
“name”: “Demo4”
}
}
},
{
“parameters”: {
“options”: {}
},
“type”: “@n8n/n8n-nodes-langchain.embeddingsOpenAi”,
“typeVersion”: 1.2,
“position”: [
-1136,
-48
],
“id”: “ff35c7cd-9da1-4afa-94c9-c903b830f57b”,
“name”: “Embeddings OpenAI”,
“credentials”: {
“openAiApi”: {
“id”: “grQsMqhepgwvfwCc”,
“name”: “n8n free OpenAI API credits”
}
}
},
{
“parameters”: {
“dataType”: “binary”,
“textSplittingMode”: “custom”,
“options”: {}
},
“type”: “@n8n/n8n-nodes-langchain.documentDefaultDataLoader”,
“typeVersion”: 1.1,
“position”: [
-960,
-48
],
“id”: “d7a783b4-087b-4c44-a813-edfaea941182”,
“name”: “Default Data Loader”
},
{
“parameters”: {
“options”: {}
},
“type”: “@n8n/n8n-nodes-langchain.textSplitterRecursiveCharacterTextSplitter”,
“typeVersion”: 1,
“position”: [
-1264,
176
],
“id”: “4699c0c6-6676-4ad6-a57b-ea0289b604ca”,
“name”: “Recursive Character Text Splitter”
},
{
“parameters”: {
“promptType”: “define”,
“text”: “={{$json.chatInput}}”,
“options”: {}
},
“type”: “@n8n/n8n-nodes-langchain.agent”,
“typeVersion”: 3.1,
“position”: [
-144,
-96
],
“id”: “78080068-cbbe-4652-b7c9-453d7c78a889”,
“name”: “AI Agent”
},
{
“parameters”: {
“options”: {}
},
“type”: “@n8n/n8n-nodes-langchain.chatTrigger”,
“typeVersion”: 1.4,
“position”: [
-336,
-80
],
“id”: “edc485ea-fe37-4bbd-80f5-bcf2106d3267”,
“name”: “When chat message received”,
“webhookId”: “996b8699-ba59-4563-bb2a-2b54ca29c9ee”
},
{
“parameters”: {
“model”: {
“__rl”: true,
“value”: “gpt-4o-mini”,
“mode”: “list”,
“cachedResultName”: “gpt-4o-mini”
},
“builtInTools”: {},
“options”: {}
},
“type”: “@n8n/n8n-nodes-langchain.lmChatOpenAi”,
“typeVersion”: 1.3,
“position”: [
-176,
160
],
“id”: “d97971cf-afbc-472b-bace-c5a3835ef1eb”,
“name”: “OpenAI Chat Model”,
“credentials”: {
“openAiApi”: {
“id”: “grQsMqhepgwvfwCc”,
“name”: “n8n free OpenAI API credits”
}
}
}
],
“pinData”: {},
“connections”: {
“Google Drive Trigger”: {
“main”: [
[
{
“node”: “Download file”,
“type”: “main”,
“index”: 0
}
]
]
},
“Download file”: {
“main”: [
[
{
“node”: “Pinecone Vector Store”,
“type”: “main”,
“index”: 0
}
]
]
},
“Embeddings OpenAI”: {
“ai_embedding”: [
[
{
“node”: “Pinecone Vector Store”,
“type”: “ai_embedding”,
“index”: 0
}
]
]
},
“Default Data Loader”: {
“ai_document”: [
[
{
“node”: “Pinecone Vector Store”,
“type”: “ai_document”,
“index”: 0
}
]
]
},
“Recursive Character Text Splitter”: {
“ai_textSplitter”: [
[
{
“node”: “Default Data Loader”,
“type”: “ai_textSplitter”,
“index”: 0
}
]
]
},
“When chat message received”: {
“main”: [
[
{
“node”: “AI Agent”,
“type”: “main”,
“index”: 0
}
]
]
},
“OpenAI Chat Model”: {
“ai_languageModel”: [
[
{
“node”: “AI Agent”,
“type”: “ai_languageModel”,
“index”: 0
}
]
]
}
},
“active”: false,
“settings”: {
“executionOrder”: “v1”,
“binaryMode”: “separate”,
“availableInMCP”: false
},
“versionId”: “d3879151-720d-4a3f-a4f6-26bb13f5f371”,
“meta”: {
“templateCredsSetupCompleted”: true,
“instanceId”: “d4a0bffc8c3932b0483d55b8dad47b7eb1002dc8762da094d201464692427a06”
},
“id”: “i63jEz20gRRXMWtI”,
“tags”: [
{
“updatedAt”: “2026-03-05T16:55:15.318Z”,
“createdAt”: “2026-03-05T16:55:15.318Z”,
“id”: “GxhO7fjtX0B6itoi”,
“name”: “MyFirstWorkFlow”
}
]
}
Thanks.
