Slither is a contract security framework written in Python and first conceived in a 2019 paper from Josselin Feist, Gustavo Grieco, and Alex Groce. The Slither framework provides automated vulnerability and optimization detection, as well as assistive codebase summaries to further developer comprehension. Born of Crytic, the blockchain security arm of Trail of Bits, Slither is Hardhat and Truffle compatible, and operational for Solidity code written in V0.4 onwards.