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§2.9. Cowork sandbox limits write/edit/bash to outputs/ by default; plugin dir is read-only; request_cowork_directory grants RW to arbitrary host folders.
Codex 또는 Claude로 설치 이 Prompt를 복사해 Codex, Claude 또는 다른 어시스턴트에 붙여 넣으면 Skill 페이지를 검토하고 설치를 진행할 수 있습니다.
SOC 직업 분류 기준
Mac Cowork で、plugin-level SessionStart hook(host 側)から $CLAUDE_PLUGIN_DATA に書いた値が「別の chat session を跨いで」残るかを検証する probe。書き込み＆読み戻しは hook(persist.sh)側で行い、その結果は SessionStart の stdout として context に出る。この skill body は対比用に「VM Bash 側から DATA が見えるか／hook が書いたファイルを読めるか」を確認する。
Surfaces UPE_PROBE_* marker lines to test whether the plugin-level UserPromptExpansion hook fires on Cowork. Invoking this skill via slash is itself the trigger; compares against UserPromptSubmit and SessionStart controls.
Triggers the plugin-level PreToolUse hooks by running a sentinel bash command, to test (via session export) whether Cowork runs PreToolUse hook commands through cmd.exe or a POSIX shell, and whether the inline block pattern actually blocks the bash tool.
Surfaces the EXEC_* marker lines emitted by the plugin-level SessionStart hooks, which run hook commands in EXEC FORM (args present). Used to test whether exec form resolves ${CLAUDE_PLUGIN_ROOT} to a real path and exports it as an env var on Cowork, where shell form (§2.1/§2.2) failed both.
Shows what skill-body CLAUDE_PLUGIN_ROOT and friends substitute to on Mac Cowork, whether the VM Bash tool can use that path, and whether the Read tool can read a bundled file at that host path.
Proves whether a skill frontmatter PreToolUse Bash hook fires on Cowork by emitting only a block decision (no echo). A marked bash should be blocked even though no frontmatter stdout surfaces.
| name | 21-cowork-connected-folder |
| description | §2.9. Cowork sandbox limits write/edit/bash to outputs/ by default; plugin dir is read-only; request_cowork_directory grants RW to arbitrary host folders. |
| user-invocable | true |
§2.9 — 接続フォルダの権限境界。
proj="${CLAUDE_PROJECT_DIR:-$PWD}"
ver="${VERIFIER_VERSION_DIR:-v-unknown}"
sid="${CLAUDE_SESSION_ID:-no-sid}"
out_dir="$proj/findings/$ver/$sid"
mkdir -p "$out_dir"
{
printf '[21-BODY %s] tag=alive-check\n' "$(date -Iseconds)"
printf '[21-BODY] CLAUDE_PROJECT_DIR=[%s]\n' "${CLAUDE_PROJECT_DIR-(unset)}"
printf '[21-BODY] CLAUDE_PLUGIN_ROOT=[%s]\n' "${CLAUDE_PLUGIN_ROOT-(unset)}"
} | tee -a "$out_dir/probe.log"
mkdir -p "${CLAUDE_PROJECT_DIR}/outputs" 2>/dev/null
echo
echo "=== Write trial: outputs/ (expected OK on Cowork) ===" | tee -a "$out_dir/probe.log"
{ echo "test-21-outputs" > "${CLAUDE_PROJECT_DIR}/outputs/canary-21.txt" 2>&1 && echo "outputs write: OK" || echo "outputs write: FAIL"; } | tee -a "$out_dir/probe.log"
echo
echo "=== Write trial: plugin dir (expected FAIL on Cowork) ===" | tee -a "$out_dir/probe.log"
{ echo "test-21-plugin" > "${CLAUDE_PLUGIN_ROOT}/canary-21.txt" 2>&1 && echo "plugin-dir write: OK" || echo "plugin-dir write: FAIL"; } | tee -a "$out_dir/probe.log"
Claude にお願いしてください：「~ への request_cowork_directory を実行して、承認したら ~/canary-21-host.txt に書き込みテストして」（Cowork 環境でのみ動作）。
完了して exit、./scripts/assert.sh 21。