/check-prereqs

name: nyann:check-prereqs
description: >
  Survey the machine and report which nyann features are usable right now.
  Classifies requirements as hard (nyann won't run without them) vs soft
  (feature-gated; graceful skip with a clear reason). Read-only; never
  installs anything.
arguments:
  - name: json
    description: If passed, emit the probe results as JSON instead of the human table.
    optional: true

**Plugin root:** This is a Claude Code plugin, NOT a CLI tool. Do NOT search via `which`, `npm list`, `pip list`, or `brew list`. This file is at `<plugin_root>/commands/`. All scripts: `<plugin_root>/bin/`. Read the matching `skills/*/SKILL.md` for the full flow.

/nyann:check-prereqs

Wraps `bin/check-prereqs.sh`. Useful before the first `/nyann:bootstrap` on a new machine — lets the user see which stacks are installable and which will skip-with-reason.

Classification

• **hard**: `git`, `jq`, `bash`. nyann exits 1 on any mutating command

without these.

• **soft**: stack toolchains (`node`, `pnpm`, `npm`, `go`, `cargo`),

integration helpers (`gh`, `gitleaks`, `pre-commit`, `uv`), and dev-only tooling (`shellcheck`, `bats`). Each is scoped to specific features; nyann degrades or skip-with-reasons when they're absent.

Output

Human-readable table by default. `/nyann:check-prereqs --json` emits a structured `prereqs[]` array (`{kind, tool, status, version, hint}`) for scripting.

When to use

• First-time setup: "what do I need to install before bootstrapping?"
• Before opening an issue: paste the output so the maintainer can see

which tools are present.

• In a team profile dry-run: confirm every teammate's machine has the

tools a profile expects.