solidity-gas-optimization — Claude Code skill: cut Solidity gas costs

What solidity-gas-optimization does

The skill hands your agent a rule set for saving gas in Solidity, split into 8 categories and ordered by impact and risk. Storage work sits at the top: skip zero-to-one writes, pack variables into fewer slots, cache storage reads, move values into constants and immutables. Below that come deployment, calldata, design patterns, cross-contract calls, compiler flags and assembly tricks.

Inside you get a priority table, short bad/good code samples, and pointers to references/solidity-gas-guidelines.md plus a references/rules/ folder with individual patterns per category. Lookup is plain grep over those rule files, by storage or assembly or struct.

Some techniques are flagged as unsafe for production: making every function payable, ignoring the return value of send(), branching on gasleft(). There is also a section on advice that no longer holds — the claim that external beats public is one of them. The skill tells you to benchmark both versions, since compiler behavior shifts with version and context, and --via-ir can make some tricks pointless.