How Does an Invariant Help in Debugging a Smart Contract?

An invariant helps in debugging by providing a clear, verifiable condition that should never be false. When a test or a formal verification tool detects a failure, the invariant violation immediately points to a breach in the contract's core financial logic.

Instead of searching through complex code, the developer knows exactly which high-level rule was broken and can trace back the sequence of transactions that led to the violation, drastically reducing the time and complexity of finding the root cause of a bug.