Automate Gmail Responses with GPT and Human-in-the-Loop Verification

This n8n workflow automates the process of generating email responses using an OpenAI Chat Model and incorporates a human-in-the-loop verification step before sending. It helps streamline email communication by providing AI-powered drafts, while ensuring accuracy and appropriateness through manual review.

What it does

1. Monitors Gmail: Continuously checks for new emails in your Gmail inbox.
2. Extracts Information: Uses an Information Extractor (likely powered by an LLM) to parse key details from the incoming email.
3. Generates AI Response: Leverages an OpenAI Chat Model to draft a suitable reply based on the extracted information.
4. Prepares for Review: Organizes the original email content, extracted information, and the AI-generated draft into a structured format.
5. Conditional Processing: Includes an If node, suggesting a conditional logic where responses might be handled differently based on certain criteria (e.g., urgency, sender, content).
6. Human-in-the-Loop (HITL) Verification: (Implied by the presence of Gmail node with HITL subcategory and the overall purpose) The workflow is designed to allow for human review of the AI-generated response before it is sent. This likely involves sending the draft to a human for approval or editing.
7. Sends Gmail Reply: Once approved (or if the condition in the If node is met to bypass review), the workflow sends the final email reply via Gmail.

Prerequisites/Requirements

• n8n Instance: A running n8n instance (self-hosted or cloud).
• Gmail Account: A Google account with Gmail enabled, configured as a credential in n8n.
• OpenAI API Key: An OpenAI API key configured as a credential in n8n for the OpenAI Chat Model.
• Langchain Integration: The @n8n/n8n-nodes-langchain package installed in your n8n instance (if not already built-in).

Setup/Usage

1. Import the Workflow:
   • Save the provided JSON content as a .json file.
   • In your n8n instance, go to "Workflows" and click "New".
   • Click the "Import from JSON" button and upload the saved .json file.
2. Configure Credentials:
   • Locate the "Gmail Trigger" node and configure your Google OAuth2 credentials to allow n8n to access your Gmail account.
   • Locate the "OpenAI Chat Model" node and configure your OpenAI API Key credential.
   • Locate the "Gmail" node (for sending replies) and configure your Google OAuth2 credentials.
3. Customize Nodes:
   • Gmail Trigger: Adjust the "Label" or "Query" parameters if you want to monitor specific inboxes, labels, or filter emails.
   • Information Extractor: Configure the schema or instructions for what information you want to extract from incoming emails.
   • OpenAI Chat Model: Fine-tune the prompt to guide the AI in generating appropriate responses for your use case.
   • If Node: Define the conditions under which the workflow should take different paths (e.g., send directly, require review, send to a different team).
   • Code Node: Review and modify the JavaScript code to transform or prepare data as needed for your specific context.
   • Edit Fields (Set) Node: Adjust which fields are being set or modified.
   • Gmail (Send) Node: Customize the subject, body, and recipient logic for the outgoing email. This is where the human-in-the-loop approval mechanism would typically be integrated, perhaps by waiting for a webhook or a signal from an external system before sending.
4. Activate the Workflow: Once configured, activate the workflow by toggling the "Active" switch in the top right corner of the workflow editor.