How Anchor's Constraints Make Solana Development Inherently Safer

Anchor's declarative constraint system provides automatic account validation that Web2 developers often overlook, preventing entire categories of security bugs before handler code executes. Through iterative development of a counter program, the article reveals how constraints like `has_one` and `init` transform manual, error-prone validation into guaranteed pre-conditions verified by the framework itself. For Solana builders, this shift from runtime checks to built-in constraints represents a fundamental change in how safe smart contracts can be written.