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The current and planned high-resolution, high-multiplexity stellarspectroscopic surveys, as well as the swelling amount of under-utilized datapresent in public archives have led to an increasing number of efforts toautomate the crucial but slow process to retrieve stellar parameters andchemical abundances from spectra. We present MyGIsFOS, a code designed toderive atmospheric parameters and detailed stellar abundances from medium -high resolution spectra of cool (FGK) stars. We describe the general structureand workings of the code, present analyses of a number of well studied starsrepresentative of the parameter space MyGIsFOS is designed to cover, andexamples of the exploitation of MyGIsFOS very fast analysis to assessuncertainties through Montecarlo tests. MyGIsFOS aims to reproduce a``traditional'' manual analysis by fitting spectral features for differentelements against a precomputed grid of synthetic spectra. Fe I and Fe II linescan be employed to determine temperature, gravity, microturbulence, andmetallicity by iteratively minimizing the dependence of Fe I abundance fromline lower energy and equivalent width, and imposing Fe I - Fe II ionizationequilibrium. Once parameters are retrieved, detailed chemical abundances aremeasured from lines of other elements. MyGIsFOS replicates closely the resultsobtained in similar analyses on a set of well known stars. It is also quitefast, performing a full parameter determination and detailed abundance analysisin about two minutes per star on a mainstream desktop computer. Currently, itspreferred field of application are high-resolution and/or large spectralcoverage data (e.g UVES, X-Shooter, HARPS, Sophie).

MyGIsFOS: an automated code for parameter determination and detailed abundance analysis in cool stars