diff --git a/.claude/hooks/memory-guard.sh b/.claude/hooks/memory-guard.sh
new file mode 100755
index 00000000..ebf3f4a4
--- /dev/null
+++ b/.claude/hooks/memory-guard.sh
@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+# 会话启动时的内存/进程守卫
+# 1. 检查可用内存，低于 2GB 时警告
+# 2. 检查是否有多个 claude 会话在运行
+# 输出 JSON 到 stdout，警告通过 additionalContext 注入
+
+AVAILABLE_MB=$(awk '/^MemAvailable:/ {print int($2/1024)}' /proc/meminfo 2>/dev/null || echo "0")
+CLAUDE_COUNT=$(pgrep -c -f "claude.*permission-mode" 2>/dev/null || echo "0")
+
+WARNINGS=""
+
+if [[ "$AVAILABLE_MB" -gt 0 && "$AVAILABLE_MB" -lt 2048 ]]; then
+  WARNINGS="${WARNINGS}- ⚠ 可用内存仅 ${AVAILABLE_MB}MB，建议关闭其他应用后再操作\n"
+fi
+
+if [[ "$CLAUDE_COUNT" -gt 2 ]]; then
+  WARNINGS="${WARNINGS}- ⚠ 检测到 ${CLAUDE_COUNT} 个 claude 会话在运行，多会话可能导致 OOM\n"
+fi
+
+if [[ -n "$WARNINGS" ]]; then
+  cat << EOF
+{
+  "continue": true,
+  "hookSpecificOutput": {
+    "hookEventName": "SessionStart",
+    "additionalContext": "## ⚠ 资源警告\n\n${WARNINGS}"
+  }
+}
+EOF
+else
+  echo '{"continue": true}'
+fi