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Frontmatter hook writes bare vs single-quoted CLAUDE_PLUGIN_ROOT and CLAUDE_PROJECT_DIR to a log, to separate shell expansion from pre-substitution at the frontmatter tier.
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
| name | fm-check |
| description | Frontmatter hook writes bare vs single-quoted CLAUDE_PLUGIN_ROOT and CLAUDE_PROJECT_DIR to a log, to separate shell expansion from pre-substitution at the frontmatter tier. |
| user-invocable | true |
| hooks | {"PreToolUse":[{"matcher":"Bash","hooks":[{"type":"command","command":"out=\"$CLAUDE_PROJECT_DIR/findings/fm-presub.log\"; { echo \"ROOT_BARE=${CLAUDE_PLUGIN_ROOT}\"; echo 'ROOT_SQ=${CLAUDE_PLUGIN_ROOT}'; echo \"PROJ_BARE=${CLAUDE_PROJECT_DIR}\"; echo 'PROJ_SQ=${CLAUDE_PROJECT_DIR}'; } >> \"$out\""}]}]} |
frontmatter hook の解決機構（事前置換 vs シェル展開）を切り分ける probe（CLI 専用）。
次の bash を実行してください。frontmatter PreToolUse:Bash hook が先に発火して、bare と single-quote 両形を log に書きます。
echo "fm-check body ran"
ROOT_BARE / PROJ_BARE（裸）が実値、かつ ROOT_SQ / PROJ_SQ（single-quote）が literal → シェル展開（env 由来。single-quote で抑止される）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.