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Big Bang 80/20: Invariant Construction
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Extract invariants from specification, encode in types/structure, enable single-pass construction.
SKILL.md
Full skill instructions
Big Bang 80/20: Invariant Construction
Core Concept
Big Bang 80/20 means single-pass construction in low-entropy domains.
Key: Extract invariants from specification, encode in types, never violate.
What Are Invariants?
Invariants are properties that must always be true:
| Domain | Invariant | Rust Type |
|---|---|---|
| Error handling | All errors Result<T,E> | Result<T, Error> |
| File paths | No traversal | SafePath wrapper |
| Age | 0 ≤ age ≤ 150 | newtype Age(u8) |
| Cache size | ≤ 10,000 entries | BoundedCache<T> |
Type-Safe Design
// ✅ Invariant encoded in type
pub struct Age(u8); // 0-255 enforced by type
impl Age {
pub fn new(value: u8) -> Result<Self, Error> {
if value > 150 {
Err(Error::InvalidAge)
} else {
Ok(Age(value))
}
}
}
Reference
See CLAUDE.md sections:
- Constitutional Rules (Type-First)
- Automatic (Type-safe design)
- Holographic Factory Metaphor (Corollary)
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