skill-registry-system-reminder-costs-20k-tokens-per-tool-call

The full skill-registry (~170 skills) is injected as a system reminder on every tool call return, consuming approximately 20k context tokens per round-trip. This becomes a significant constraint in long multi-stage sessions that involve many tool calls across 50+ file edits. Plan high-volume skill editing sessions to front-load bulk writes early, minimize tool call count, and use batch scripts over sequential individual edits.