菜单
Reads the /tmp canary written by the plugin-level SessionStart hook, to test whether the hook (host) and the Bash tool (VM) share a filesystem.
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基于 SOC 职业分类
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 ${CLAUDE_PLUGIN_ROOT} to a real path and exports it as an env var on Cowork, where shell form (§2.1/§2.2) failed both.
Shows what skill-body CLAUDE_PLUGIN_ROOT and friends substitute to on Mac Cowork, whether the VM Bash tool can use that path, and whether the Read tool can read a bundled file at that host path.
Proves whether a skill frontmatter PreToolUse Bash hook fires on Cowork by emitting only a block decision (no echo). A marked bash should be blocked even though no frontmatter stdout surfaces.
| name | fs-check |
| description | Reads the /tmp canary written by the plugin-level SessionStart hook, to test whether the hook (host) and the Bash tool (VM) share a filesystem. |
| user-invocable | true |
plugin-level SessionStart hook が /tmp/cowork-fs-canary.txt に書き込みました。Bash tool から読めるか確認します。次の bash を実行してください。
echo "BODY host=$(hostname)"
echo "--- cat /tmp/cowork-fs-canary.txt ---"
cat /tmp/cowork-fs-canary.txt 2>&1
echo "--- ls ---"
ls -la /tmp/cowork-fs-canary.txt 2>&1
実行後、context にある [FS-HOOK] wrote ... host=... の行も併せて貼ってください（hook が動いた host 名が分かります）。
判定：
FS_CANARY_CONTENT が出る + BODY host が hook host と同じ → 同一 filesystem（CLI 予想）No such file or directory + BODY host=claude（hook host と違う） → hook はホスト / Bash tool は VM の別 filesystem（Cowork 予想）