nexum This workflow corresponds to n8n.io template #15902 — we link there as the canonical source.
This workflow follows the Chainllm → Gmail 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 →
{
"name": "Email Lead Qualifier",
"nodes": [
{
"id": "t5-sticky-s0",
"name": "Overview",
"type": "n8n-nodes-base.stickyNote",
"position": [
180,
-200
],
"parameters": {
"color": 5,
"width": 1470,
"height": 180,
"content": "## Email Lead Qualifier\n\nReceive a lead form submission via webhook \u2192 score it **HOT / WARM / COLD** with Claude Haiku \u2192 route instantly: email alert for hot leads, Sheets log for warm leads, webhook response for all.\n\n**3-step setup:** \u2460 Add your **Anthropic API key** in the **Claude Haiku** sub-node \u00b7 \u2461 Enter your **notification email** in the **Alert: Email HOT Lead** node \u00b7 \u2462 Add your **Google Sheets document ID** in the **Log WARM Lead** node"
},
"typeVersion": 1
},
{
"id": "t5-sticky-s1",
"name": "Section 1",
"type": "n8n-nodes-base.stickyNote",
"position": [
180,
60
],
"parameters": {
"color": 4,
"width": 730,
"height": 824,
"content": "## 1 \u2014 Receive Lead & Classify\nSend a **POST** request with: `name`, `email`, `company`, `message`\n\n**Claude Haiku** classifies the lead:\n- **HOT** \u2014 Urgent need, confirmed budget, decision-maker\n- **WARM** \u2014 Real interest, unclear need or no confirmed budget\n- **COLD** \u2014 Vague message, no identifiable need\n\n\u2192 Add your **Anthropic API key** in the **Claude Haiku** sub-node."
},
"typeVersion": 1
},
{
"id": "t5-sticky-s2",
"name": "Section 2",
"type": "n8n-nodes-base.stickyNote",
"position": [
930,
60
],
"parameters": {
"color": 6,
"width": 720,
"height": 680,
"content": "## 2 \u2014 Route & Respond\n**HOT** \u2192 Instant Gmail alert with full lead details\n**WARM** \u2192 Lead logged to Google Sheets for follow-up\n**COLD** \u2192 No action taken, webhook response returned\n\n**Setup:**\n1. **Alert: Email HOT Lead** \u2014 enter your notification email in `Send To`\n2. **Log WARM Lead** \u2014 enter your Google Sheets document ID\n3. Connect **Gmail OAuth2** and **Google Sheets OAuth2** credentials"
},
"typeVersion": 1
},
{
"id": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
"name": "Receive Lead",
"type": "n8n-nodes-base.webhook",
"position": [
240,
360
],
"parameters": {
"path": "lead-qualifier",
"options": {},
"httpMethod": "POST",
"responseMode": "responseNode"
},
"typeVersion": 2.1
},
{
"id": "b2c3d4e5-f6a7-8901-bcde-f12345678901",
"name": "Set Lead Fields",
"type": "n8n-nodes-base.set",
"position": [
464,
360
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "field-name",
"name": "name",
"type": "string",
"value": "={{ $json.body.name }}"
},
{
"id": "field-email",
"name": "email",
"type": "string",
"value": "={{ $json.body.email }}"
},
{
"id": "field-company",
"name": "company",
"type": "string",
"value": "={{ $json.body.company }}"
},
{
"id": "field-message",
"name": "message",
"type": "string",
"value": "={{ $json.body.message }}"
}
]
}
},
"typeVersion": 3.4
},
{
"id": "c3d4e5f6-a7b8-9012-cdef-123456789012",
"name": "Score Lead with Claude",
"type": "@n8n/n8n-nodes-langchain.chainLlm",
"position": [
640,
360
],
"parameters": {
"text": "={{ 'You are a B2B lead qualification expert.\\n\\nHere is the prospect information:\\nName: ' + $json.name + '\\nEmail: ' + $json.email + '\\nCompany: ' + $json.company + '\\nMessage: ' + $json.message + '\\n\\nClassify this lead as HOT, WARM, or COLD:\\n- HOT: urgent need, confirmed budget, decision-maker in direct contact, precise message\\n- WARM: real interest but vague need, no confirmed budget, or non-decision-maker\\n- COLD: vague message, no identifiable need\\n\\nRespond with a score (HOT, WARM, or COLD) and a one-sentence justification.' }}",
"batching": {},
"promptType": "define",
"hasOutputParser": true
},
"typeVersion": 1.9
},
{
"id": "d4e5f6a7-b8c9-0123-defa-234567890123",
"name": "Claude Haiku",
"type": "@n8n/n8n-nodes-langchain.lmChatAnthropic",
"position": [
688,
536
],
"parameters": {
"model": {
"mode": "id",
"value": "claude-haiku-4-5-20251001"
},
"options": {}
},
"credentials": {
"anthropicApi": {
"name": "<your credential>"
}
},
"typeVersion": 1.5
},
{
"id": "e5f6a7b8-c9d0-1234-efab-345678901234",
"name": "Structured Output Parser",
"type": "@n8n/n8n-nodes-langchain.outputParserStructured",
"position": [
688,
664
],
"parameters": {
"schemaType": "manual",
"inputSchema": "{\"type\":\"object\",\"properties\":{\"score\":{\"type\":\"string\",\"enum\":[\"HOT\",\"WARM\",\"COLD\"]},\"justification\":{\"type\":\"string\"}},\"required\":[\"score\",\"justification\"]}"
},
"typeVersion": 1.3
},
{
"id": "f6a7b8c9-d0e1-2345-fabc-456789012345",
"name": "Route by Score",
"type": "n8n-nodes-base.switch",
"position": [
1000,
360
],
"parameters": {
"rules": {
"values": [
{
"outputKey": "HOT",
"conditions": {
"options": {
"version": 1,
"leftValue": "",
"caseSensitive": false,
"typeValidation": "loose"
},
"combinator": "and",
"conditions": [
{
"operator": {
"type": "string",
"operation": "equals"
},
"leftValue": "={{ $json.output.score }}",
"rightValue": "HOT"
}
]
},
"renameOutput": true
},
{
"outputKey": "WARM",
"conditions": {
"options": {
"version": 1,
"leftValue": "",
"caseSensitive": false,
"typeValidation": "loose"
},
"combinator": "and",
"conditions": [
{
"operator": {
"type": "string",
"operation": "equals"
},
"leftValue": "={{ $json.output.score }}",
"rightValue": "WARM"
}
]
},
"renameOutput": true
}
]
},
"options": {
"fallbackOutput": "extra"
}
},
"typeVersion": 3.4
},
{
"id": "a7b8c9d0-e1f2-3456-abcd-567890123456",
"name": "Alert: Email HOT Lead",
"type": "n8n-nodes-base.gmail",
"position": [
1220,
360
],
"parameters": {
"sendTo": "user@example.com",
"message": "=<h2>New HOT Lead</h2><p><strong>Name:</strong> {{ $('Set Lead Fields').item.json.name }}</p><p><strong>Email:</strong> {{ $('Set Lead Fields').item.json.email }}</p><p><strong>Company:</strong> {{ $('Set Lead Fields').item.json.company }}</p><p><strong>Message:</strong> {{ $('Set Lead Fields').item.json.message }}</p><hr><p><strong>AI Score:</strong> HOT</p><p><strong>Justification:</strong> {{ $json.output.justification }}</p>",
"options": {
"appendAttribution": false
},
"subject": "=HOT Lead: {{ $('Set Lead Fields').item.json.name }} \u2014 {{ $('Set Lead Fields').item.json.company }}",
"operation": "send"
},
"credentials": {
"gmailOAuth2": {
"name": "<your credential>"
}
},
"typeVersion": 2.2
},
{
"id": "b8c9d0e1-f2a3-4567-bcde-678901234567",
"name": "Log WARM Lead",
"type": "n8n-nodes-base.googleSheets",
"position": [
1220,
520
],
"parameters": {
"columns": {
"value": {
"Date": "={{ $now.toISO() }}",
"Name": "={{ $('Set Lead Fields').item.json.name }}",
"Email": "={{ $('Set Lead Fields').item.json.email }}",
"Status": "=WARM \u2014 {{ $json.output.justification }}",
"Company": "={{ $('Set Lead Fields').item.json.company }}",
"Message": "={{ $('Set Lead Fields').item.json.message }}"
},
"schema": [
{
"id": "Date",
"displayName": "Date",
"canBeUsedToMatch": false
},
{
"id": "Name",
"displayName": "Name",
"canBeUsedToMatch": false
},
{
"id": "Email",
"displayName": "Email",
"canBeUsedToMatch": false
},
{
"id": "Company",
"displayName": "Company",
"canBeUsedToMatch": false
},
{
"id": "Message",
"displayName": "Message",
"canBeUsedToMatch": false
},
{
"id": "Status",
"displayName": "Status",
"canBeUsedToMatch": false
}
],
"mappingMode": "defineBelow",
"matchingColumns": []
},
"options": {},
"operation": "append",
"sheetName": {
"mode": "id",
"value": "0"
},
"documentId": {
"mode": "id",
"value": ""
}
},
"credentials": {
"googleSheetsOAuth2Api": {
"name": "<your credential>"
}
},
"typeVersion": 4.7
},
{
"id": "c9d0e1f2-a3b4-5678-cdef-789012345678",
"name": "Return Score to Caller",
"type": "n8n-nodes-base.respondToWebhook",
"position": [
1440,
420
],
"parameters": {
"options": {
"responseCode": 200
},
"respondWith": "json",
"responseBody": "={{ JSON.stringify({ success: true, score: $('Score Lead with Claude').item.json.output.score, justification: $('Score Lead with Claude').item.json.output.justification }) }}"
},
"typeVersion": 1.5
}
],
"active": false,
"settings": {
"executionOrder": "v1",
"saveManualExecutions": true
},
"staticData": null,
"connections": {
"Claude Haiku": {
"ai_languageModel": [
[
{
"node": "Score Lead with Claude",
"type": "ai_languageModel",
"index": 0
}
]
]
},
"Receive Lead": {
"main": [
[
{
"node": "Set Lead Fields",
"type": "main",
"index": 0
}
]
]
},
"Log WARM Lead": {
"main": [
[
{
"node": "Return Score to Caller",
"type": "main",
"index": 0
}
]
]
},
"Route by Score": {
"main": [
[
{
"node": "Alert: Email HOT Lead",
"type": "main",
"index": 0
}
],
[
{
"node": "Log WARM Lead",
"type": "main",
"index": 0
}
],
[
{
"node": "Return Score to Caller",
"type": "main",
"index": 0
}
]
]
},
"Set Lead Fields": {
"main": [
[
{
"node": "Score Lead with Claude",
"type": "main",
"index": 0
}
]
]
},
"Alert: Email HOT Lead": {
"main": [
[
{
"node": "Return Score to Caller",
"type": "main",
"index": 0
}
]
]
},
"Score Lead with Claude": {
"main": [
[
{
"node": "Route by Score",
"type": "main",
"index": 0
}
]
]
},
"Structured Output Parser": {
"ai_outputParser": [
[
{
"node": "Score Lead with Claude",
"type": "ai_outputParser",
"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.
anthropicApigmailOAuth2googleSheetsOAuth2Api
Pro
For the full experience including quality scoring and batch install features for each workflow upgrade to Pro
About this workflow
This workflow receives inbound lead data via a webhook, uses Anthropic Claude to qualify it as HOT, WARM, or COLD, then routes HOT leads to Gmail and WARM leads to Google Sheets, and finally returns the score in the webhook response. Receives a POST webhook request containing…
Source: https://n8n.io/workflows/15902/ — original creator credit. Request a take-down →
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