Automated email digest from Gmail to Slack with GPT-4o summary

Who’s it for

Teams that start their day in Slack and want a concise, automated summary of yesterday’s emails—ops leads, PMs, founders, and anyone handling busy inboxes without writing code.

What it does / How it works

Runs every morning at 08:00 (cron 0 0 8 ), fetches all emails received yesterday, and routes the result: if none were found, it posts a polite “no emails” notice; if emails exist, it aggregates them and asks an AI agent to produce a structured digest, then formats and posts to your chosen Slack channel. The flow uses Gmail → If → Aggregate (Item Lists) → AI Agent (OpenRouter model with structured output) → Code (Slack formatter) → Slack. A set of sticky notes on the canvas explains each step and required inputs.

How to set up

1. Connect Gmail (OAuth2) and keep the default date window (yesterday → today at 00:00). 2. Connect Slack (OAuth2) and select your target channel. 3. Add OpenRouter credentials and pick a compact model (e.g., gpt-4o-mini). 4. Keep the provided structured-output schema and formatter code. 5. Adjust the schedule/timezone if needed (the fallback message includes an Asia/Tokyo example). 6. Paste this description into the yellow sticky note at the top of the canvas.

Requirements

Gmail & Slack accounts with appropriate scopes OpenRouter API key stored in Credentials (no hard-coded keys) n8n Cloud or self-host with LangChain agent nodes enabled