`shuf` is a GNU coreutil which requires `brew install coreutils` on
macOS. Replace it with `echo $((RANDOM % <sides> + 1))` which works in
bash and zsh on both Linux and macOS.
Also reword "true randomness" to "using a random number generator" to
more clearly distinguish programmatic RNG from LLM non-determinism.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Adds a tutorial-style quickstart guide that walks the reader through
creating their first Agent Skill — a `roll-dice` skill that teaches an
agent to roll dice using true system randomness. The guide covers
creating the `SKILL.md` file, verifying discovery via `/skills` in VS
Code, testing with a "Roll a d20" prompt, and a brief explanation of the
discovery/activation/execution lifecycle. Includes both bash and
PowerShell command variants, and a note about model variation in
tool-use reliability.
Also adds the quickstart as the first page under "For skill creators" in
`docs.json` navigation.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>