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Probe that hook commands run under /bin/sh (dash on WSL Ubuntu), not bash (§1.3). Bash-specific constructs should produce Bad substitution / syntax errors.
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 ${CLAUDE_PLUGIN_ROOT} to a real path and exports it as an env var on Cowork, where shell form (§2.1/§2.2) failed both.
Shows what skill-body CLAUDE_PLUGIN_ROOT and friends substitute to on Mac Cowork, whether the VM Bash tool can use that path, and whether the Read tool can read a bundled file at that host path.
Proves whether a skill frontmatter PreToolUse Bash hook fires on Cowork by emitting only a block decision (no echo). A marked bash should be blocked even though no frontmatter stdout surfaces.
| name | 03-shell-binsh |
| description | Probe that hook commands run under /bin/sh (dash on WSL Ubuntu), not bash (§1.3). Bash-specific constructs should produce Bad substitution / syntax errors. |
| user-invocable | true |
| hooks | {"PreToolUse":[{"matcher":"Bash","hooks":[{"type":"command","command":"{ printf \"[03-FM-bashisms %s] BASH_VERSION=[%s] uppercased=[${PWD^^}]\\n\" \"$(date -Iseconds)\" \"$BASH_VERSION\" 2>&1; } >> \"$CLAUDE_PROJECT_DIR/findings/${VERIFIER_VERSION_DIR:-v-unknown}/${CLAUDE_SESSION_ID:-no-sid}/probe.log\" 2>&1 ; exit 0"}]}]} |
§1.3 — hook 実行は /bin/sh（dash）。bash 固有構文で Bad substitution / syntax error。
proj="${CLAUDE_PROJECT_DIR:-$PWD}"
ver="${VERIFIER_VERSION_DIR:-v-unknown}"
sid="${CLAUDE_SESSION_ID:-no-sid}"
out_dir="$proj/findings/$ver/$sid"
mkdir -p "$out_dir"
{
printf '[03-BODY %s] tag=alive-check\n' "$(date -Iseconds)"
printf '[03-BODY] /bin/sh -> %s\n' "$(readlink -f /bin/sh)"
/bin/sh -c 'printf "[03-binsh] BASH_VERSION=[%s] RANDOM=[%s]\n" "$BASH_VERSION" "$RANDOM"'
/bin/sh -c '[[ "$X" = "y" ]] && echo "[[ works"' 2>&1 || printf '[03-binsh] [[ syntax error (expected)\n'
/bin/sh -c 'echo "${PWD^^}"' 2>&1 || printf '[03-binsh] ^^ syntax error (expected)\n'
} | tee -a "$out_dir/probe.log"
proj="${CLAUDE_PROJECT_DIR:-$PWD}"
ver="${VERIFIER_VERSION_DIR:-v-unknown}"
sid="${CLAUDE_SESSION_ID:-no-sid}"
echo "=== probe.log (shell test) ==="
tail -n 30 "$proj/findings/$ver/$sid/probe.log"
echo
echo "=== hooks.log (frontmatter hook bashism attempt) ==="
grep -A2 '03-FM-bashisms' "$proj/findings/$ver/$sid/hooks.log" 2>&1 || echo "(no match)"
完了して exit、./scripts/assert.sh 03。