How I Built an AI That Reads, Labels & Replies to Gmail

Most inboxes are chaotic: job offers mixed with newsletters, client emails buried, important messages missed. I didn’t want to just “manage” Gmail — I wanted it to think.

I built an AI Gmail Assistant with n8n, Google Gemini, and LangChain. It:

Reads emails

Understands content

Labels correctly

Drafts polite replies

Tech Stack: n8n Workflow, Gemini LLM, LangChain AI Agent, Gmail Tool, Structured Output Parser

Workflow: polls Gmail → fetches message → AI classifies & drafts → parses JSON → labels → saves draft

Challenges: Polling isn’t real-time, messy JSON, label ID mismatches, plain text dull → switched to HTML

Results: ✔️ Inbox automated ✔️ 70% less time managing emails ✔️ Replies ready instantly ✔️ Labels synced perfectly