Individual skill

eip712-signing

Use when implementing EIP-712 typed structured data signing. Covers domain separator, type hashing, encoding rules, DOMAIN_SEPARATOR caching, chain ID fork handling, permit (EIP-2612), and gasless transaction patterns.

skills/eip712-signing/SKILL.md

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# EIP-712 Typed Structured Data Signing

## Overview

EIP-712 provides human-readable signing for structured data. Users see what they're signing in their wallet instead of opaque hex. Used by EIP-2612 (Permit), governance voting, meta-transactions, and order books.

## Domain Separator

```solidity
bytes32 constant DOMAIN_TYPEHASH = keccak256(
    "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"
);

function _buildDomainSeparator() internal view returns (bytes32) {