# 20 Cowork Validation

> CLI validates plugins fully; Cowork reports a generic Plugin validation failed without exposing the cause (research section 2.3). Runs claude plugin validate on isolated violator variants.

- Skill: `kazukinagata/20-cowork-validation` (Agent Skill)
- Install (CLI): `npx skillmds@latest add kazukinagata/20-cowork-validation`
- Raw SKILL.md: https://api.skillmd.com/api/skills/kazukinagata/20-cowork-validation/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Research & Search
- Author: kazukinagata (https://skillmd.com/u/kazukinagata)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/kazukinagata/20-cowork-validation

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# 20-cowork-validation

§2.3 — Cowork での **validation 失敗の理由が出ない**。CLI は具体的なエラー。

## step 1: alive-check と CLI validation baseline

```bash
proj="${CLAUDE_PROJECT_DIR:-$PWD}"
ver="${VERIFIER_VERSION_DIR:-v-unknown}"
sid="${CLAUDE_SESSION_ID:-no-sid}"
out_dir="$proj/findings/$ver/$sid"
mkdir -p "$out_dir"
printf '[20-BODY %s] tag=alive-check\n' "$(date -Iseconds)" | tee -a "$out_dir/probe.log"
echo
echo "=== 20a: UserPromptExpansion variant plugin ===" | tee -a "$out_dir/probe.log"
claude plugin validate "$proj/verifier-violator-userpromptexpansion" 2>&1 | tee -a "$out_dir/probe.log" || true
echo
echo "=== 20b: uppercase plugin name variant ===" | tee -a "$out_dir/probe.log"
claude plugin validate "$proj/verifier-violator-uppercase-name" 2>&1 | tee -a "$out_dir/probe.log" || true
```

完了して exit、`./scripts/assert.sh 20`。