The new `load_skill` tool was registered into the agent and plan
mode tool sets in 0c1699 but the prompt's `## Toolbox`
quick-reference still listed only the legacy progressive-
disclosure pattern (system prompt → read_file). The model has to
read the tool description to know `load_skill` exists, but
without a hint in the toolbox it's easy to miss when scanning.
Adds a `**Skills**` line that points at `load_skill` and explains
when to prefer it over `read_file` + `list_dir`. Pulls from the
existing `## Skills` section above for context, so the model
sees one short cross-reference instead of duplicate setup
instructions.
No code change; prompt-only doc edit. Existing prompt-stability
tests pass unchanged because they don't compare prose.
Hunter Bown
99223b148c