Managing AWS environments across multiple accounts introduces a visibility problem that the console alone doesn't solve well. Cost anomalies accumulate quietly across accounts, security posture drifts between review cycles, and Well-Architected findings go unaddressed simply because no one has a consolidated view of what needs attention. I ran into this repeatedly and eventually decided to build something to address it.

The Architecture Problem

The core challenge with multi-account visibility is access. You need a pattern that scales across an arbitrary number of accounts without requiring persistent credentials in each one. The standard approach is cross-account IAM role assumption a central account hosts your analysis engine, and each member account has a read-only IAM role with a trust policy pointing back to the central account's Lambda execution role.