How to build CLI tool + skill to work longer without compacting

I work with AI agents daily and try really hard to minimise context switching and enable agent to use all the tools I'd normally use during development, which goes really well nowadays as agents are good into finding those tools themselves. But as my work requires ClickUp, I got tired of alt-tabbing to it for every status update, comment, or task description I just wanted to feed that into context, so I prompted a CLI for it, along with a skill, so agent would pick it up automatically. The whole project was built with Claude Opus 4, set to High mode via OpenCode (😉) Not a single line.