snowflake-v2-progressive-disclosure-for-skill-files

Monolithic skill files (1000+ lines) load their full token cost on every invocation even when only one phase executes. Splitting into a 50-line entry point that references phase-specific files (loaded on demand) achieves 95%+ reduction in baseline token cost. The session-close skill went from 1230 lines to a 54-line entry point with 8 phase reference files — same capability, fraction of the cost per session.