n8n Lead Qualification: GPT-4o, Gmail & Google Sheets Webhook

Instant lead qualification in n8n with GPT-4o + Gmail + Google Sheets

Stop manually triaging inbound enquiries. This n8n workflow accepts lead submissions via a webhook, uses an OpenAI (GPT-4o) agent to enrich and score each lead against your ideal-customer rules, and then routes the result by emailing you, adding leads to Google Sheets for nurture, or sending a polite decline email.

What this workflow does

• Receives inbound leads: Listens for a POST webhook request on /lead containing a new enquiry.
• Applies your qualification rules: Attaches your ideal-customer profile logic (e.g., IDEAL / GOOD / POOR / DECLINE) along with urgent signals to the incoming lead data.
• Enriches and scores using GPT-4o: Uses an n8n LangChain agent to call an enrichment sub-workflow and then a scoring sub-workflow, producing a fit score (1–10) and an urgency flag.
• Routes the lead automatically:
  • Emails the owner via Gmail when the score is 7+ or the lead is marked urgent.
  • Appends mid-fit leads (score 4–6) to a nurture list in Google Sheets, including enquiry details, score, and status.
  • Sends a warm decline email via Gmail when the score is 3 or below or the request matches your DECLINE rules.

Use cases

• Qualify SaaS demo requests submitted through a website form (webhook → GPT-4o scoring → Gmail follow-up).
• Prioritize high-intent inbound leads by urgency, while logging mid-fit leads to Google Sheets for ongoing nurture.
• Automatically respond to low-fit enquiries with a brief decline email to protect your sales time.

Technical details

• Webhook node for receiving POST requests on /lead
• OpenAI GPT-4o via n8n-nodes-langchainagent (agent/orchestrator)
• Gmail tool to email the owner and send customer decline messages
• Google Sheets tool to append nurture leads (configure spreadsheet and sheet name)
• Sub-workflows for enrich_lead and score_lead (set their workflow IDs in the template)