n8n Lead Qualification Workflow: GPT-4o + Gmail + Google Sheets

Automatically qualify inbound leads with GPT-4o—then email or nurture in seconds

This n8n Lead Qualification Workflow captures new web form enquiries via a webhook, uses an OpenAI GPT-4o agent to enrich and score each lead against your ideal-customer rules, and then routes results to Gmail for priority follow-up or to Google Sheets for nurture tracking—plus polite declines for out-of-scope leads.

What this workflow does

• Receives enquiries by accepting a POST request on the /lead webhook with the new enquiry payload.
• Applies your ideal customer profile rules and urgency signals by attaching them to the incoming data.
• Enriches and scores with GPT-4o using an orchestrator n8n LangChain agent: it calls an enrichment sub-workflow first, then a scoring sub-workflow.
• Routes qualified leads to Gmail: high-scoring or urgent leads trigger a Gmail email to the workflow owner with a summary and contact details.
• Tracks mid-scoring leads in Google Sheets: appends enquiry info, score, and status to a nurture list.
• Declines low-scoring leads via Gmail using a polite out-of-scope email based on the scoring outcome.

Use cases

• SaaS teams that want instant lead prioritization from landing page forms.
• Automation engineers building AI-assisted qualification pipelines in n8n.
• Operators who need a simple system to follow up quickly on high-intent enquiries and keep the rest organized.

Technical details

• Nodes/Tools used: webhook, set, Gmail tool, Google Sheets tool, n8n-nodes-langchainagent (GPT-4o agent), plus a Sticky Note.
• Required setup: add OpenAI credentials for GPT-4o; configure the two sub-workflows for enrich_lead and score_lead; connect Gmail and set the priority recipient inbox; connect Google Sheets with the target spreadsheet document ID and sheet name; update the ideal customer profile rules text.