Gusto finds /login leading-space tokens billed

The author examines how different types of slash commands function in Claude Code, explaining which ones consume tokens and which run locally without hitting the model. By analyzing built-in categories, hooks, and telemetry, the article demonstrates how transcript scraping and prompt hooks each miss certain entry points. To measure skill usage accurately, the author recommends combining UserPromptExpansion and PostToolUse hooks. Open article →