菜单
§2.7. In Cowork, hook side effects (file writes) don't reach the shell sandbox. Only stdout/additionalContext flows through. This probe writes a canary file from a hook (via the inline command below) then tries to read it from Bash tool.
默认使用会先检查来源的 Prompt；你也可以切换为直接命令，或下载本地副本。
决定是否安装前，请先阅读 SKILL.md，以及 SkillsMP 当前展示的配套文件。
用 Codex 或 Claude 帮你安装 复制这段 Prompt，粘贴到 Codex、Claude 或其他助手里，让它检查 Skill 页面并帮你完成安装。
直接命令不会经过审查 Prompt；运行前请先检查来源。
npx skills add https://github.com/kazukinagata/analyzing-claude-plugin --skill 15-cowork-file-io命令会保持在同一行。复制前请横向滚动并检查完整内容。
想先保存到本地？可下载 SkillsMP 当前能够提供的文件。
Mac Cowork で、plugin-level SessionStart hook(host 側)から $CLAUDE_PLUGIN_DATA に書いた値が「別の chat session を跨いで」残るかを検証する probe。書き込み＆読み戻しは hook(persist.sh)側で行い、その結果は SessionStart の stdout として context に出る。この skill body は対比用に「VM Bash 側から DATA が見えるか／hook が書いたファイルを読めるか」を確認する。
Surfaces UPE_PROBE_* marker lines to test whether the plugin-level UserPromptExpansion hook fires on Cowork. Invoking this skill via slash is itself the trigger; compares against UserPromptSubmit and SessionStart controls.
Triggers the plugin-level PreToolUse hooks by running a sentinel bash command, to test (via session export) whether Cowork runs PreToolUse hook commands through cmd.exe or a POSIX shell, and whether the inline block pattern actually blocks the bash tool.
基于 SOC 职业分类
正在显示 SKILL.md
| name | 15-cowork-file-io |
| description | §2.7. In Cowork, hook side effects (file writes) don't reach the shell sandbox. Only stdout/additionalContext flows through. This probe writes a canary file from a hook (via the inline command below) then tries to read it from Bash tool. |
| user-invocable | true |
| hooks | {"PreToolUse":[{"matcher":"Bash","hooks":[{"type":"command","command":"ts=$(date +%s%N); marker_path=\"/tmp/file-io-canary-$ts.txt\"; printf \"[15-FM marker_path=%s wrote_at=%s]\" \"$marker_path\" \"$(date -Iseconds)\" > \"$marker_path\" 2>/dev/null; printf \"[15-FM-hook fired marker_path=%s]\\n\" \"$marker_path\" >> \"$CLAUDE_PROJECT_DIR/findings/${VERIFIER_VERSION_DIR:-v-unknown}/${CLAUDE_SESSION_ID:-no-sid}/probe.log\" 2>/dev/null"}]}]} |
§2.7 — Cowork で hook 内 file write が届かない。
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 '[15-BODY %s] tag=alive-check\n' "$(date -Iseconds)"
printf '[15-BODY] file-io-canary files in /tmp:\n'
ls -la /tmp/file-io-canary-*.txt 2>&1
} | tee -a "$out_dir/probe.log"
echo
echo "=== probe.log: 15-FM-hook lines (proves hook was called) ==="
grep "15-FM-hook" "$out_dir/probe.log" 2>&1
完了して exit、./scripts/assert.sh 15。