diff --git a/.clang-format b/.clang-format
new file mode 100644
index 0000000..7051425
--- /dev/null
+++ b/.clang-format
@@ -0,0 +1,11 @@
+Language: Cpp
+BasedOnStyle: Google
+AccessModifierOffset: -2
+AlignConsecutiveAssignments: true
+AllowShortFunctionsOnASingleLine: Empty
+ColumnLimit: 96
+Cpp11BracedListStyle: true
+DerivePointerAlignment: false
+SortIncludes: false
+SpacesBeforeTrailingComments: 1
+Standard: Cpp11
diff --git a/tools/formatAll.sh b/tools/formatAll.sh
new file mode 100755
index 0000000..47e04cd
--- /dev/null
+++ b/tools/formatAll.sh
@@ -0,0 +1,8 @@
+#!/bin/bash
+
+. "$(dirname "$0")/isTopLevel.sh"
+
+for f in $(git ls-files | grep -E '.*\.(cc|h)$'); do
+  echo "formatting ${f}"
+  clang-format -i "${f}"
+done
diff --git a/tools/isTopLevel.sh b/tools/isTopLevel.sh
new file mode 100644
index 0000000..97f7cc8
--- /dev/null
+++ b/tools/isTopLevel.sh
@@ -0,0 +1,9 @@
+#!/bin/bash
+
+if ! git rev-parse --is-inside-work-tree > /dev/null 2>&1; then
+  exit 1
+fi
+
+if [ "$(pwd)" != "$(git rev-parse --show-toplevel)" ]; then
+  exit 1
+fi
diff --git a/tools/validate/format.sh b/tools/validate/format.sh
new file mode 100755
index 0000000..3140408
--- /dev/null
+++ b/tools/validate/format.sh
@@ -0,0 +1,14 @@
+#!/bin/bash
+
+. "$(dirname "$0")/../isTopLevel.sh"
+
+RETVAL=0
+
+for f in $(git ls-files | grep -E '.*\.(cc|h)$'); do
+  if ! clang-format "${f}" | diff "${f}" - > /dev/null 2>&1; then
+    echo "Error: Invalid code formatting in ${f}" >&2
+    RETVAL=1
+  fi
+done
+
+exit $RETVAL
diff --git a/tools/validate/includeGuard.sh b/tools/validate/includeGuard.sh
new file mode 100755
index 0000000..a66b80f
--- /dev/null
+++ b/tools/validate/includeGuard.sh
@@ -0,0 +1,25 @@
+#!/bin/bash
+
+. "$(dirname "$0")/../isTopLevel.sh"
+
+RETVAL=0
+
+for f in $(git ls-files | grep -E '^src\/.*\.h$'); do
+  # ファイルパスから正しいインクルードガードの文字列を生成する
+  s1="$(echo "$f" | sed -r 's/^src\///; s/[\/\.-]+/_/g; s/^.*$/\U&/')_"
+
+	# ファイルからインクルードガードを読み込む
+  s2=$(grep -Pzo '#ifndef\s+\K\b(\w+)\b(?=\s+#define\s+\b\1\b)' "$f" | tr '\0' '\n')
+
+  if [ -z "$s2" ]; then
+    echo "error: $f: include guard is missing or incorrect" >&2
+    echo "       ($s1)" >&2
+    RETVAL=1
+  elif [ "$s2" != "$s1" ]; then
+    echo "error: $f: include guard is incorrect" >&2
+    echo "       ($s2 => $s1)" >&2
+    RETVAL=1
+  fi
+done
+
+exit $RETVAL