08b-self-block-attempt

name	08b-self-block-attempt
description	Companion to 08. Tests whether a skill's own frontmatter hook can block its own load (it cannot — frontmatter hooks register AFTER load).
user-invocable	true
hooks	{"PreToolUse":[{"matcher":"Skill","hooks":[{"type":"command","command":"ver=\"${VERIFIER_VERSION_DIR:-v-unknown}\"; sid=\"${CLAUDE_SESSION_ID:-no-sid}\"; out_dir=\"$CLAUDE_PROJECT_DIR/findings/$ver/$sid\"; mkdir -p \"$out_dir\"; printf \"[08b-FM %s] tag=block-emitted reason=\\\"blocked by 08b-self-block-attempt\\\"\\n\" \"$(date -Iseconds)\" >> \"$out_dir/probe.log\"; printf '{\"decision\":\"block\",\"reason\":\"blocked by 08b-self-block-attempt (testing whether self-blocking works)\"}\\n'"}]}]}

08b-self-block-attempt

このスキルは自分自身（PreToolUse:Skill）を block しようとしますが、frontmatter hook は load 後にしか登録されないため、自身の最初の起動は block されません。

step 1: alive-check

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 '[08b-BODY %s] tag=alive-check (this proves 08b loaded — frontmatter cannot block itself)\n' "$(date -Iseconds)" | tee -a "$out_dir/probe.log"

step 2: 同セッション内で 08b を再 invoke した場合の block

ユーザに「次のプロンプトで 08b-self-block-attempt skill をもう一度呼んでください と自然文で頼んでみてください」と依頼。
2 度目の呼び出しが block されることを確認（blocked by 08b-self-block-attempt が cli output に出る）。