Nothing is written to the AWS account until a human opens the door: collection runs through a read-only role, simulation is the default mode, and a real write requires a second opt-in role.
Internal stepExternal serviceCheckpoint — review or opt-inVerified outputApplication boundary
Waste is detected with a read-only role; writing only exists on the amber path, behind a second opt-in IAM role. The other two paths leave the tool (Git, backlog) and come back through the verification step. A saving is only declared once seven days of billing have gone by.