Daniel Nkencho This workflow corresponds to n8n.io template #9382 — we link there as the canonical source.
This workflow follows the Agent → OpenAI Embeddings recipe pattern — see all workflows that pair these two integrations.
The workflow JSON
Copy or download the full n8n JSON below. Paste it into a new n8n workflow, add your credentials, activate. Full import guide →
{
"meta": {
"templateCredsSetupCompleted": true
},
"nodes": [
{
"id": "113d6fd7-2850-4562-adad-d664ba8dc448",
"name": "Gmail Trigger",
"type": "n8n-nodes-base.gmailTrigger",
"position": [
3104,
2080
],
"parameters": {
"simple": false,
"filters": {},
"options": {},
"pollTimes": {
"item": [
{
"mode": "everyMinute"
}
]
}
},
"credentials": {
"gmailOAuth2": {
"name": "<your credential>"
}
},
"typeVersion": 1.3
},
{
"id": "d1d4a3be-70bc-436b-a7b9-2ee00e426a55",
"name": "Gemini 2.5",
"type": "@n8n/n8n-nodes-langchain.lmChatGoogleGemini",
"position": [
3312,
2288
],
"parameters": {
"options": {}
},
"credentials": {
"googlePalmApi": {
"name": "<your credential>"
}
},
"typeVersion": 1
},
{
"id": "dd551d6b-adb2-473b-8982-8ac9b3be46b3",
"name": "Gmail Reply",
"type": "n8n-nodes-base.gmail",
"position": [
3664,
2080
],
"parameters": {
"message": "={{ $json.output }}",
"options": {
"appendAttribution": false
},
"emailType": "text",
"messageId": "={{ $('Gmail Trigger').item.json.id }}",
"operation": "reply"
},
"credentials": {
"gmailOAuth2": {
"name": "<your credential>"
}
},
"typeVersion": 2.1
},
{
"id": "32c51c6d-4ba8-45c4-b689-a7906d5a66b6",
"name": "Cohere Reranker",
"type": "@n8n/n8n-nodes-langchain.rerankerCohere",
"position": [
3744,
2448
],
"parameters": {},
"credentials": {
"cohereApi": {
"name": "<your credential>"
}
},
"typeVersion": 1
},
{
"id": "5a55a56f-07f0-4da9-b333-be81d39c49c7",
"name": "Pinecone Retriever",
"type": "@n8n/n8n-nodes-langchain.vectorStorePinecone",
"position": [
3568,
2288
],
"parameters": {
"mode": "retrieve-as-tool",
"topK": 10,
"options": {},
"useReranker": true,
"pineconeIndex": {
"__rl": true,
"mode": "list",
"value": "agency-info",
"cachedResultName": "agency-info"
},
"toolDescription": "Info About <agency> services, owner and general FAQ"
},
"credentials": {
"pineconeApi": {
"name": "<your credential>"
}
},
"typeVersion": 1.3
},
{
"id": "fd1413ab-433f-43f0-9dbf-6726c62fac44",
"name": "OpenAI Embeddings",
"type": "@n8n/n8n-nodes-langchain.embeddingsOpenAi",
"position": [
3568,
2448
],
"parameters": {
"model": "text-embedding-3-large",
"options": {
"dimensions": 1024
}
},
"credentials": {
"openAiApi": {
"name": "<your credential>"
}
},
"typeVersion": 1.2
},
{
"id": "b587ef62-ec9c-4727-ac16-6e5b2862fe78",
"name": "Email Support Agent",
"type": "@n8n/n8n-nodes-langchain.agent",
"position": [
3312,
2080
],
"parameters": {
"text": "={{ $json.text }}",
"options": {
"systemMessage": "You are an email support agent for the agency. Use the pinecone tool to access its knowledge base."
},
"promptType": "define"
},
"typeVersion": 2.2
},
{
"id": "11ccc8a7-11fb-4bbc-8593-7d203de1614e",
"name": "Postgres Memory",
"type": "@n8n/n8n-nodes-langchain.memoryPostgresChat",
"position": [
3408,
2384
],
"parameters": {
"tableName": "email_support_agent_",
"sessionKey": "={{ $json.id }}",
"sessionIdType": "customKey"
},
"credentials": {
"postgres": {
"name": "<your credential>"
}
},
"typeVersion": 1.3
},
{
"id": "e2482901-3f58-4adb-817d-cbd48f777f7b",
"name": "Note: Pinecone",
"type": "n8n-nodes-base.stickyNote",
"position": [
3856,
2128
],
"parameters": {
"color": 2,
"width": 350,
"height": 240,
"content": "## \ud83d\uddc4\ufe0f Node: Pinecone Retriever\n\n**Purpose:** RAG tool retrieves top 10 docs from 'agency-info' index.\n\n**Key Settings:**\n- Mode: retrieve-as-tool\n- Embeddings: OpenAI text-embedding-3-large (1024 dims)\n- Reranker: Cohere enabled\n\n**Note:** Pre-populate index with agency knowledge base."
},
"typeVersion": 1
},
{
"id": "95398a05-9d35-4913-83ab-62bb9113594b",
"name": "Note: Cohere",
"type": "n8n-nodes-base.stickyNote",
"position": [
3472,
2592
],
"parameters": {
"color": 3,
"width": 398,
"height": 244,
"content": "## \ud83d\udd04 Node: Cohere Reranker\n\n**Purpose:** Semantically reorders Pinecone results for better relevance.\n\n**Key Settings:**\n- Connected to vector store\n- Improves RAG accuracy\n\n**Note:** Uses Cohere API; monitor token usage."
},
"typeVersion": 1
},
{
"id": "f578bcf8-4019-4c0e-abe3-78dc5b85c026",
"name": "Note: Agent",
"type": "n8n-nodes-base.stickyNote",
"position": [
3088,
1792
],
"parameters": {
"color": 5,
"width": 398,
"height": 252,
"content": "## \ud83e\udd16 Node: Email Support Agent\n\n**Purpose:** AI agent processes email with tools/memory.\n\n**Key Settings:**\n- User Prompt: Email text\n- LLM: Gemini 2.5\n- Memory: Postgres per email ID\n\n**Note:** Outputs reply text for Gmail."
},
"typeVersion": 1
},
{
"id": "ab002e7f-180b-439d-a544-a9daae2d68c5",
"name": "Overview Note1",
"type": "n8n-nodes-base.stickyNote",
"position": [
2256,
1712
],
"parameters": {
"color": 4,
"width": 728,
"height": 1480,
"content": "# AI Email Support Agent with RAG & Cohere Reranking\n\n## \ud83d\udccb What This Template Does\nTriggers on new Gmail emails, uses a LangChain agent with Postgres memory to retrieve from Pinecone (RAG via OpenAI embeddings), reranks with Cohere for relevance, generates replies using Gemini 2.5, and auto-responds.\n\n## \ud83d\udd27 Prerequisites\n- n8n instance with LangChain nodes\n- Gmail, OpenAI, Cohere, Gemini, Pinecone, Postgres accounts\n\n## \ud83d\udd11 Required Credentials\n\n### Gmail OAuth2\n1. Enable Gmail API in Google Cloud\n2. Create OAuth2 credential in n8n with scopes: https://www.googleapis.com/auth/gmail.readonly, https://www.googleapis.com/auth/gmail.send\n\n### OpenAI API\n1. Get API key from platform.openai.com\n2. Add as OpenAI credential\n\n### Cohere API\n1. Sign up at cohere.com\n2. Copy API key to n8n Cohere credential\n\n### Google Gemini API\n1. Generate key at https://aistudio.google.com/\n2. Add as Google PaLM credential\n\n### Pinecone API\n1. Create index \"agency-info\" (dimension 1024)\n2. Add API key to n8n Pinecone credential\n\n### Postgres\n1. Set up database (e.g., Neon/Supabase)\n2. Add connection details to n8n Postgres credential\n\n## \u2699\ufe0f Configuration Steps\n1. Import JSON into n8n\n2. Assign all credentials\n3. Populate Pinecone with agency docs (use separate upsert workflow)\n4. Set tableName in Memory if needed\n5. Activate and test with a sample email\n\n## \ud83c\udfaf Use Cases\n- Automate agency support for FAQs/services\n- Handle client inquiries with context-aware replies\n- Scale email responses without human intervention\n\n## \u26a0\ufe0f Troubleshooting\n- No trigger: Check Gmail scopes/polling\n- Retrieval empty: Verify Pinecone index/docs/dimensions\n- Rerank fails: Ensure Cohere key valid\n- Memory issues: Confirm Postgres connection/sessionKey"
},
"typeVersion": 1
}
],
"connections": {
"Gemini 2.5": {
"ai_languageModel": [
[
{
"node": "Email Support Agent",
"type": "ai_languageModel",
"index": 0
}
]
]
},
"Gmail Trigger": {
"main": [
[
{
"node": "Email Support Agent",
"type": "main",
"index": 0
}
]
]
},
"Cohere Reranker": {
"ai_reranker": [
[
{
"node": "Pinecone Retriever",
"type": "ai_reranker",
"index": 0
}
]
]
},
"Postgres Memory": {
"ai_memory": [
[
{
"node": "Email Support Agent",
"type": "ai_memory",
"index": 0
}
]
]
},
"OpenAI Embeddings": {
"ai_embedding": [
[
{
"node": "Pinecone Retriever",
"type": "ai_embedding",
"index": 0
}
]
]
},
"Pinecone Retriever": {
"ai_tool": [
[
{
"node": "Email Support Agent",
"type": "ai_tool",
"index": 0
}
]
]
},
"Email Support Agent": {
"main": [
[
{
"node": "Gmail Reply",
"type": "main",
"index": 0
}
]
]
}
}
}
Credentials you'll need
Each integration node will prompt for credentials when you import. We strip credential IDs before publishing — you'll add your own.
cohereApigmailOAuth2googlePalmApiopenAiApipineconeApipostgres
Pro
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About this workflow
Transform your inbox into an intelligent support system: automatically detect new emails, retrieve relevant knowledge from Pinecone, rerank with Cohere for precision, generate contextual replies using Gemini AI, and respond—all while maintaining conversation history.
Source: https://n8n.io/workflows/9382/ — original creator credit. Request a take-down →
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