Automatic Reminders for Follow-ups with AI and Human-in-the-Loop (Gmail)

This n8n workflow automates the process of sending follow-up reminders, leveraging AI to draft personalized messages and incorporating a human-in-the-loop approval step via Gmail. It's designed to ensure important follow-ups are never missed and that communications are always relevant and approved before sending.

What it does

1. Schedules Daily Check: The workflow is triggered daily to check for events.
2. Fetches Google Calendar Events: Retrieves events from a specified Google Calendar.
3. Filters for Relevant Events: Filters the fetched events based on specific criteria (e.g., event name, status) to identify those requiring a follow-up.
4. Removes Duplicate Events: Ensures that each event is processed only once, preventing redundant follow-up attempts.
5. Prepares Data for AI: Transforms and structures the event data into a format suitable for the AI agent.
6. AI Drafts Follow-up Email: An AI agent (powered by OpenAI) generates a draft follow-up email based on the event details.
7. Parses AI Output: Extracts the structured email content (subject, body, recipient) from the AI's response.
8. Sends Human-in-the-Loop Email for Approval: Sends the AI-drafted email to a designated human for review and approval via Gmail. This email will likely contain options to approve or reject the follow-up.
9. Processes Approval/Rejection (Implicit): While not explicitly shown in the provided JSON, a complete human-in-the-loop setup would typically involve another workflow or a subsequent node that listens for responses to the approval email (e.g., a webhook triggered by a click on an "Approve" button in the email) to then send the final follow-up or take other actions.

Prerequisites/Requirements

• n8n Instance: A running n8n instance.
• Google Calendar Account: Authenticated Google Calendar credentials in n8n to fetch events.
• Gmail Account: Authenticated Gmail credentials in n8n to send approval emails.
• OpenAI API Key: An API key for OpenAI to power the AI Agent and Chat Model.

Setup/Usage

1. Import the workflow: Import the provided JSON into your n8n instance.
2. Configure Credentials:
   • Google Calendar: Set up your Google Calendar OAuth2 credentials.
   • Gmail: Set up your Gmail OAuth2 credentials.
   • OpenAI Chat Model: Configure your OpenAI API Key credentials.
3. Customize Nodes:
   • Schedule Trigger: Adjust the schedule frequency as needed (e.g., daily at a specific time).
   • Google Calendar: Specify the calendar ID and any filters for events you want to monitor.
   • Filter: Define the conditions for which events should trigger a follow-up (e.g., events ending in the last 24 hours, events with specific keywords in the title).
   • Edit Fields (Set): Customize the data structure passed to the AI agent.
   • AI Agent / OpenAI Chat Model: Refine the prompt to guide the AI in drafting effective follow-up emails.
   • Structured Output Parser: Ensure the parser correctly extracts the subject, body, and recipient from the AI's output.
   • Gmail: Configure the recipient for the human-in-the-loop approval email and the content of that approval request.
4. Activate the Workflow: Once configured, activate the workflow to start sending automatic reminders.