attac-t Skill: Craft Context
"When an action needs too many parameters, the parameters become the object."
The Standard
- Private Constructor: Direct instantiation blocked. Forces use of named factories.
- Named Factories:
::forProvider(),::forBatch(). Intent in the name. - Self-Validating: Validate in constructor. Invalid context throws immediately.
- Immutable:
readonly class. Set once, read many. No setters.
The Anti-Patterns
| ❌ Don't | ✅ Do | Why |
|---|---|---|
| 5+ action parameters | Context object | Clarity, maintainability |
| Generic constructor | Named constructors | Intent is explicit |
| Mutable context | Immutable properties | Prevents bugs in long chains |
| Array of options | Typed properties | IDE support, validation |
Real-World Examples
See examples.md.