hidden-coupling-vault-auth

What problem does it solve? Files that change together but share no import relationship reveal hidden architectural coupling that developers often miss, causing incomplete changes and broken tests. This Skill captures three recorded lessons showing that backend/app/api/routes/vault_members.py co-changes with three test files at NPMI=1.000. ## Core Features & Use Cases - Hidden Coupling Awareness: Records that vault_members.py co-changes with test_auth_routes.py, test_vault_group_access_routes.py, and test_vault_members_routes.py despite having no import relationship. - Change Guidance: Instructs that modifications to the vault members route likely require corresponding updates to all three coupled test files. - Use Case: When editing backend/app/api/routes/vault_members.py, apply this Skill to remember to update the three coupled test files in the same change, avoiding CI failures from stale tests. ## Quick Start Apply this skill whenever modifying backend/app/api/routes/vault_members.py and update the three coupled test files in the same commit.