🛠️ Show & Tell: AI Voice Receptionist — Retell AI + n8n + Google Sheets + Retool

Hey Contra community 👋

Just wrapped a full AI voice receptionist build for a home services client and wanted to share what went into it.

What it does:

Answers inbound calls 24/7 using Retell AI

Runs 3 real-time checks via n8n: service area · slot availability · customer lookup

Books the appointment live on the call — no double-booking

Logs to Google Sheets and fires a confirmation email automatically

Full Retool command center for the client to manage everything

The tricky part: Retell AI has a toggle called "Payload: args only" — when enabled, it strips the parent wrapper from the webhook payload. Took a solid debug session to figure out why n8n kept returning empty data. Once I caught it and rebuilt the payload mapping, everything worked end to end.

Stack: Retell AI · n8n · Google Sheets · Retool MCP

Happy to answer questions on any part of the build — webhooks, n8n sub-workflow structure, Retool dashboard setup, whatever.

If you're a builder who gets overflow work in voice AI or home services automation, let's connect 🤝

Nice systems thinking in this build—the handoff between voice intake, availability checks, booking, and confirmation is clearly mapped to a real user outcome. The Retool command center also makes the automation legible instead of hiding it behind the scenes.

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