This article introduces the Fault Tolerance Analyser Tool, an open-source utility for identifying AWS resources with single points of failure that violate multi-AZ fault tolerance best practices.

• Open-source tool inspects AWS resources for fault tolerance configuration issues
• Analyzes 15 AWS services including RDS, Lambda, DynamoDB, ElastiCache, and others
• Generates CSV reports identifying potential availability and resilience problems
• Supports multi-account analysis with customizable threading and output options
• Findings can be saved locally, to S3, or posted to EventBridge
• Complements AWS Well-Architected Tool, Trusted Advisor, and Resilience Hub
• Does not assess cross-region redundancy or dependencies outside analyzed resources
• Recommended for scheduled automation, CI/CD pipelines, and change management gates

The tool automates fault tolerance validation against AWS Well-Architected Framework reliability best practices, helping teams proactively identify and remediate single points of failure in their cloud infrastructure.