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§2.4 / §2.5. Self-blocker skill. Its frontmatter PreToolUse:Skill hook returns a JSON block decision for any Skill tool call to 11-block-target. Must be invoked BEFORE 11-block-target so the hook is registered.
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 ${CLAUDE_PLUGIN_ROOT} to a real path and exports it as an env var on Cowork, where shell form (§2.1/§2.2) failed both.
Shows what skill-body CLAUDE_PLUGIN_ROOT and friends substitute to on Mac Cowork, whether the VM Bash tool can use that path, and whether the Read tool can read a bundled file at that host path.
Proves whether a skill frontmatter PreToolUse Bash hook fires on Cowork by emitting only a block decision (no echo). A marked bash should be blocked even though no frontmatter stdout surfaces.
| name | 12-block-self |
| description | §2.4 / §2.5. Self-blocker skill. Its frontmatter PreToolUse:Skill hook returns a JSON block decision for any Skill tool call to 11-block-target. Must be invoked BEFORE 11-block-target so the hook is registered. |
| user-invocable | true |
| hooks | {"PreToolUse":[{"matcher":"Skill","hooks":[{"type":"command","command":"payload=$(cat 2>/dev/null || true)\ncase \"$payload\" in\n *11-block-target*)\n cat <<JSON\n{\"decision\":\"block\",\"reason\":\"blocked by 12-block-self frontmatter hook (target was 11-block-target)\"}\nJSON\n ;;\n *)\n # Allow other Skill calls\n :\n ;;\nesac\n"}]}]} |
§2.4 — frontmatter PreToolUse:Skill で 11-block-target だけを block する。
proj="${CLAUDE_PROJECT_DIR:-$PWD}"
ver="${VERIFIER_VERSION_DIR:-v-unknown}"
sid="${CLAUDE_SESSION_ID:-no-sid}"
out_dir="$proj/findings/$ver/$sid"
mkdir -p "$out_dir"
printf '[12-BODY %s] tag=alive-check (self-blocker registered)\n' "$(date -Iseconds)" | tee -a "$out_dir/probe.log"
次のプロンプトで、自然文で「11-block-target skill を起動してください」とユーザに依頼してもらう（slash 経由は §1.9 によると Skill tool が呼ばれないので block 経路にならない）。