Context Sync

Keeps .context/ files in sync with the actual codebase. Prevents context drift — the #1 failure mode of spec-driven development.

When to Use This Skill

• After installing or removing a dependency
• After creating new files or directories
• After completing a feature spec
• When starting a new session (validation mode)

Sync Rules

Dependency Changes → stack.md

When a dependency is added, removed, or upgraded:

1. Read .context/stack.md
2. Check if the change is already reflected
3. If not, propose an update with: package name, purpose, version, and constraints