Validate property documents with Claude (Anthropic), Google Drive and Slack

Description

This workflow ingests property document packages submitted via webhook or monitored cloud storage, extracts text from each file, runs Claude AI to verify legal compliance, detect missing or expired documents, flag invalid clauses, and produces a structured validation report with remediation guidance.

How it works

Trigger — Webhook submission or Google Drive folder watch
Intake & Register — Logs submission, assigns case ID, normalises metadata
Download Documents — Fetches each file from Drive / S3 / URL
Extract Text — Reads PDF/DOCX content via parser node
Classify Document Type — Identifies contract, title, disclosure, certificate, etc.
AI Legal Compliance Check — Claude AI validates each document against jurisdiction rules
Aggregate Validation Results — Merges per-document findings into a case report
Check Required Doc Checklist — Detects missing mandatory documents
Route by Compliance Status — Branches on PASS / FAIL / REQUIRES_REVIEW
Notify Submitter — Email with full validation report and remediation steps
Alert Legal Team on Slack — Flags FAIL or critical issues to legal channel
Create Audit Record — Writes full report to Google Sheets compliance log
Generate PDF Report — Stores formatted report back to Drive
Return Validation Response — Sends structured JSON result to caller

Setup Steps

Import workflow into n8n
Configure credentials:
Anthropic API — Claude AI for legal document analysis
Google Drive OAuth — Document intake and report storage
Google Sheets OAuth — Compliance audit log
Slack OAuth — Legal team alerts
SendGrid / SMTP — Submitter notification emails
Set your Google Drive folder IDs for intake and output
Configure jurisdiction rules in the AI prompt node
Set mandatory document checklist in the Checklist node
Activate the workflow

Sample Webhook Payload
{
"caseId": "CASE-2025-0871",
"submitterEmail": "[email protected]",
"propertyAddress": "42 Oak Street, Sydney NSW 2000",
"transactionType": "sale",
"jurisdiction": "NSW",
"documents": [
{
"name": "Contract of Sale",
"type": "contract",
"driveFileId": "1aBcDeFgHiJkL"
},
{
"name": "Title Search",
"type": "title",
"driveFileId": "2mNoPqRsTuVwX"
}
]
}

Document Types Supported
Contract of Sale / Purchase Agreement
Certificate of Title / Title Search
Vendor Disclosure Statement
Section 32 / Vendor Statement
Building & Pest Inspection Report
Strata Report / Body Corporate Docs
Zoning Certificate / Planning Certificate
Land Tax Certificate
Mortgage / Discharge of Mortgage
Lease Agreement / Tenancy Documents
Council Rates Notice
Smoke Alarm / Safety Certificates

Features
Multi-document batch validation per submission
Jurisdiction-aware compliance rules (AU/UK/US configurable)
Missing document detection against mandatory checklist
Expiry date validation for time-sensitive certificates
Critical clause and red-flag detection
Automated remediation guidance per issue
Full audit trail in Google Sheets
PDF validation report stored to Drive

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