n8n Contract Review Workflow: Google Drive, OpenAI & Slack PDF

Auto-review contracts from Google Drive—analyze PDFs with OpenAI and send attorney-ready reports to Slack

This n8n Contract Review Workflow watches a Google Drive folder for new contract PDFs, extracts their text, uses OpenAI to identify key clauses and risks, generates a professional attorney-style PDF report, saves it back to Google Drive, and notifies your Slack channel with the results.

What this workflow does

• Monitors your intake folder: Triggers every minute when a new file is created in a specified Google Drive contract folder.
• Downloads and extracts PDF text: Retrieves the uploaded contract file from Google Drive and extracts the full text from the PDF.
• Analyzes the contract with OpenAI: Sends the extracted text to OpenAI to produce structured JSON covering contract type, key terms, risk score, risks, missing clauses, and recommendations.
• Generates an attorney report PDF: Converts the OpenAI analysis into a professionally styled HTML attorney report and then converts that HTML into a PDF (via HTML-to-PDF conversion).
• Saves and organizes files in Google Drive: Uploads the generated report to a target Google Drive folder and moves the original contract into a separate “processed” folder.
• Notifies Slack: Posts a completion message to a Slack channel including the risk details and the link to the generated report.

Use cases

• Legal ops teams reviewing inbound vendor/customer agreements stored in Google Drive
• SaaS operators triaging contracts by risk score and missing clauses
• Automation engineers building an end-to-end contract review workflow with n8n, OpenAI, and Slack

Technical details

• Triggers: n8n scheduled trigger (runs every minute) + Google Drive “new file” detection
• Core nodes/services: Google Drive, Extract from file (PDF text extraction), OpenAI (gpt-4o-mini), HTML-to-PDF conversion (HTMLCSS to PDF), Slack
• Credentials required: Google Drive OAuth, OpenAI API credential, Slack credentials
• Setup includes: intake folder, report destination folder, processed folder, and ensuring the HTML-to-PDF node is available in your n8n instance