master-of: Gave my 20+ Claude Code skills a bouncer at the door

A developer built master-of, an open-source plugin that gates Claude Code skills behind domain-specific categories so only the skills relevant to a task load into the system prompt. The tool, released under the MIT license, aims to cut token usage and speed up session startup by keeping unused skill descriptions dormant, and includes a session-start hook that flags newly installed skills for sorting.

Noticed my Claude Code sessions were getting slower to start and burning tokens before I'd even said anything. Turns out every installed skill's description sits in the system prompt all the time, whether that session needs it or not. I had a decent-sized personal library and it was quietly costing me thousands of tokens a session for stuff I touch once a month. So I built master-of . It's basically a bouncer — skills stay dormant behind a handful of domain gates design, dev, research, whatever you want , and Claude only opens the one gate a task actually needs instead of loading everyone's ID at the door. It also self-maintains a bit: a session-start hook notices when you've installed something new and flags it for sorting, and there's a check-skills command if you just want to see what's gated and roughly how many tokens you're saving. Nothing happens behind your back — plugin changes only kick in on restart, so it just tells you what needs attention and lets you decide. /plugin marketplace add devrudals/master-of /plugin install master-of@master-of MIT licensed, needs bun or Node 22.6+: https://github.com/devrudals/master-of https://github.com/devrudals/master-of Built this for my own setup — curious if the default gates make sense for anyone else's skill pile.