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

Description and use

Master-of reduces token usage and speeds up Claude Code startup by gating unused skills behind domain-specific gates.

Problem

Claude Code sessions were slow to start and consuming excessive tokens because every installed skill’s description was loaded into the system prompt regardless of use.

Outcome

Master-of reduced token consumption per session by gating unused skills, leading to faster startup and lower costs.

Workflow

• Install master-of via the plugin marketplace
• Restart Claude Code to apply changes
• When a new skill is installed, the session-start hook flags it for sorting
• Use the check-skills command to view gated skills and estimated token savings
• Enable or disable gates as needed for specific domains

Evidence

Turns out every installed skill's description sits in the system prompt all the time, whether that session needs it or not.

Source

So I built master-of. It's basically a bouncer — skills stay dormant behind a handful of domain gates...

Source