Check Prerequisites

---
description: "Read-only report of whether the external tools the instruction-placement plugin declares in prerequisites.json resolve, through the shared Node checker. /instruction-placement:check gates rule globs; this skill checks the plugin's own tools. Use when a hook notice says node or jq is missing, or before assuming the rules index drift hook ran. Does not install."
user-invocable: true
disable-model-invocation: false
metadata:
  workflow-stage: anytime
  summary: Report whether node and jq resolve for instruction-placement. Never installs.
---

## Purpose

Run the read-only check. Do not install anything, and do not edit `prerequisites.json`.

The plugin's `check` skill already means the rule-glob gate, so the prerequisites check has its own name. A hook notice names this skill.

## Check

Run the shared checker through its stub, which reports a missing `node` instead of failing to start:

```bash
sh "${CLAUDE_PLUGIN_ROOT}/lib/prerequisites.sh" check "${CLAUDE_PLUGIN_ROOT}" --data-dir "${CLAUDE_PLUGIN_DATA}"
```

Where there is no `sh` (Windows without Git Bash), run the PowerShell stub with the same arguments instead:

```powershell
powershell -NoProfile -ExecutionPolicy Bypass -File "${CLAUDE_PLUGIN_ROOT}/lib/prerequisites.ps1" check "${CLAUDE_PLUGIN_ROOT}" --data-dir "${CLAUDE_PLUGIN_DATA}"
```

Report the PASS/FAIL rows as a table. On a FAIL, give the install hints the checker printed. Stop.

## Next

A passing check has no successor. For the rule-glob gate, run `/instruction-placement:check`.

## Gotchas

This skill does not install. A hook notice is not permission to install Node.js or jq.