# 00 Canary

> Observation infrastructure canary. Verifies that plugin-level hooks fire (via session-start log), that skill frontmatter hooks register and fire after first invoke, and that bash tool subprocess can write to the findings directory. Run this BEFORE any other probe — if this FAILs, the verdict of every later probe is CANARY-FAILED.

- Skill: `kazukinagata/00-canary` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add kazukinagata/00-canary`
- Raw SKILL.md: https://api.skillmd.com/api/skills/kazukinagata/00-canary/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: kazukinagata (https://skillmd.com/u/kazukinagata)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/kazukinagata/00-canary

---


# 00-canary

このスキルは**観測基盤の生存確認**です。後続のすべての probe の前提となるため、最初に走らせてください。

次の bash を1つずつ実行してください：

## step 1: alive-check tag を skill body から出力

```bash
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 '[00-canary-body %s] tag=alive-check sid=%s\n' "$(date -Iseconds)" "$sid" | tee -a "$out_dir/probe.log"
```

## step 2: log file の存在と中身を確認

```bash
proj="${CLAUDE_PROJECT_DIR:-$PWD}"
ver="${VERIFIER_VERSION_DIR:-v-unknown}"
sid="${CLAUDE_SESSION_ID:-no-sid}"
echo "=== hooks.log ($proj/findings/$ver/$sid/hooks.log) ==="
ls -la "$proj/findings/$ver/$sid/" 2>&1
echo
echo "=== probe.log ==="
cat "$proj/findings/$ver/$sid/probe.log" 2>&1
echo
echo "=== hooks.log (last 60 lines) ==="
tail -n 60 "$proj/findings/$ver/$sid/hooks.log" 2>&1
```

完了したら exit してください。`./scripts/assert.sh 00` で観測基盤の生存判定が走ります。