Use this skill to decide whether Terraform or OpenTofu dependencies come from where their authors intended and whether that trust is actually enforced at install time: provider source addresses and namespace lookalikes, `.terraform.lock.hcl` coverage across every platform that runs `init`, the `h1:`/`zh:` hash schemes, mirrors and `dev_overrides` that bypass verification, and module sources pinned to mutable references. Static review of declarations, lock files, and CLI configuration only.
