wtf is hold-my-coffee?

Hold My Coffee is a pack of Agent Skills, meaning instruction files that change how an AI coding assistant behaves, aimed at making the assistant act more like a careful senior engineer than a quick code generator. Rather than jumping straight to writing code, it pushes the AI to first understand the existing system, write only the code needed to do the job, avoid known bad patterns, and treat every line of code it adds as something that has an ongoing cost. The pack contains a single main skill called sdlc. It is built as a short master file covering the overall stance and ten core rules, plus nine separate handbook files that get pulled in only when the AI reaches that stage of work: exploring a problem, breaking it into small shippable pieces, designing and building it, debugging with an evidence chain, reviewing a change before it ships, testing it in a fresh environment, checking it from a customer's point of view, and two cross cutting handbooks covering stability, security, and interface design. The AI reads the master file at the start of any task and only opens the handbook relevant to the phase it is currently in, rather than loading everything at once. Because Agent Skills are just a folder containing a SKILL.md file, this pack works with many different AI coding tools, including Claude Code, Codex, and Cursor, and over seventy others, through a single install command from the skills command line tool. Claude Code users can alternatively install it as a native plugin through Claude Code's own plugin marketplace. Both installation paths support updating and removing the skill later, either from one specific tool or from every tool it was installed to. The repository was written by its author together with an Anthropic AI model. It is released under the MIT license, and the author asks that changes be proposed as issues rather than pull requests.