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error-handling

Custom error patterns and revert handling for Solidity. Use when designing error hierarchies, implementing try/catch for external calls, or establishing error conventions across a protocol. Covers custom errors, revert patterns, error propagation, and NatSpec documentation.

skills/error-handling/SKILL.md

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# Error Handling

## Custom Errors vs Require Strings

Custom errors are cheaper and more expressive. Always prefer them.

```solidity
// BAD: require with string (~200 gas more per revert, larger bytecode)
require(amount > 0, "Amount must be greater than zero");
require(msg.sender == owner, "Not authorized");

// GOOD: custom errors
error ZeroAmount();
error Unauthorized(address caller, address required);