Codex实装，RegularGridFloor

.codex/hooks/log-agent.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+# Claude Code SubagentStart hook: Log agent invocations for audit trail
+# Tracks which agents are being used and when
+#
+# Input schema (SubagentStart) — per Claude Code hooks reference:
+# { "session_id": "...", "agent_id": "agent-abc123", "agent_type": "Explore", ... }
+#
+# The agent name is in `agent_type`, NOT `agent_name`. Reading `.agent_name`
+# returns null on every invocation, so the fallback "unknown" is always used
+# and the audit trail captures nothing useful.
+
+INPUT=$(cat)
+
+# Parse agent name -- use jq if available, fall back to grep
+if command -v jq >/dev/null 2>&1; then
+    AGENT_NAME=$(echo "$INPUT" | jq -r '.agent_type // "unknown"' 2>/dev/null)
+else
+    AGENT_NAME=$(echo "$INPUT" | grep -oE '"agent_type"[[:space:]]*:[[:space:]]*"[^"]*"' | sed 's/"agent_type"[[:space:]]*:[[:space:]]*"//;s/"$//')
+    [ -z "$AGENT_NAME" ] && AGENT_NAME="unknown"
+fi
+
+TIMESTAMP=$(date +%Y%m%d_%H%M%S)
+SESSION_LOG_DIR="production/session-logs"
+
+mkdir -p "$SESSION_LOG_DIR" 2>/dev/null
+
+echo "$TIMESTAMP | Agent invoked: $AGENT_NAME" >> "$SESSION_LOG_DIR/agent-audit.log" 2>/dev/null
+
+exit 0