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Single-quote isolation probe to fill team-report §1.2 unverified cells. Tests Claude Code pre-substitution in plugin-level hook + skill frontmatter hook + skill body for SESSION_ID, PROJECT_DIR, SKILL_DIR, and user_config.KEY.
Codex または Claude でインストール この Prompt をコピーして Codex、Claude、または他のアシスタントに貼り付けると、Skill ページを確認してインストールできます。
SOC 職業分類に基づく
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 ${CLAUDE_PLUGIN_ROOT} to a real path and exports it as an env var on Cowork, where shell form (§2.1/§2.2) failed both.
Shows what skill-body CLAUDE_PLUGIN_ROOT and friends substitute to on Mac Cowork, whether the VM Bash tool can use that path, and whether the Read tool can read a bundled file at that host path.
Proves whether a skill frontmatter PreToolUse Bash hook fires on Cowork by emitting only a block decision (no echo). A marked bash should be blocked even though no frontmatter stdout surfaces.
| name | 22-substitution-frontmatter |
| description | Single-quote isolation probe to fill team-report §1.2 unverified cells. Tests Claude Code pre-substitution in plugin-level hook + skill frontmatter hook + skill body for SESSION_ID, PROJECT_DIR, SKILL_DIR, and user_config.KEY. |
| user-invocable | true |
| hooks | {"PreToolUse":[{"matcher":"Bash","hooks":[{"type":"command","command":"\"${CLAUDE_PLUGIN_ROOT}/hooks/subst-probe.sh\" fm SESSION_ID '${CLAUDE_SESSION_ID}'"},{"type":"command","command":"\"${CLAUDE_PLUGIN_ROOT}/hooks/subst-probe.sh\" fm PROJECT_DIR '${CLAUDE_PROJECT_DIR}'"},{"type":"command","command":"\"${CLAUDE_PLUGIN_ROOT}/hooks/subst-probe.sh\" fm SKILL_DIR '${CLAUDE_SKILL_DIR}'"}]}]} |
§1.2 マトリクスの未検証セルを single-quote isolation で観測する probe。
'${CLAUDE_SESSION_ID}' のように single-quote 内に ${VAR} を書くと：
${...}期待結果（v2.1.146 推測）：
| tier | SESSION_ID | PROJECT_DIR | SKILL_DIR | user_config.KEY |
|---|---|---|---|---|
| plugin-level | ? | ✅ | ? | ✅ |
| frontmatter | ? | ? | ? | — |
| body | ✅ | ✅ | ✅ | ? |
proj="${CLAUDE_PROJECT_DIR:-$PWD}"
ver="${VERIFIER_VERSION_DIR:-v-unknown}"
out_dir="$proj/findings/$ver/probe-22"
mkdir -p "$out_dir"
# body tier — single-quote isolation
echo '[BODY] USER_CONFIG_HELLO=${user_config.hello_message}' >> "$out_dir/subst.log"
echo '[BODY] USER_CONFIG_API=${user_config.api_secret}' >> "$out_dir/subst.log"
echo '[BODY] SESSION_ID=${CLAUDE_SESSION_ID}' >> "$out_dir/subst.log"
echo '[BODY] PROJECT_DIR=${CLAUDE_PROJECT_DIR}' >> "$out_dir/subst.log"
echo '[BODY] SKILL_DIR=${CLAUDE_SKILL_DIR}' >> "$out_dir/subst.log"
# show all results
echo "=== subst.log (tier=plugin: SessionStart 経路, tier=fm: 自スキル frontmatter 経路, tier=body: 直前 echo) ==="
cat "$out_dir/subst.log"
各行を見て：
9307ae27-...) → 事前置換 ✅/home/...) → 事前置換 ✅${CLAUDE_SESSION_ID} 等 → 事前置換 ❌完了したら exit。