diff --git a/ios/build.zsh b/ios/build.zsh
index 59fbf46..5d65cd2 100755
--- a/ios/build.zsh
+++ b/ios/build.zsh
@@ -55,16 +55,50 @@ function cleanup_build {
 	pod install
 	cd ..
 
-	# 4. Signing (Manual Step)
-	echo "4. Opening Xcode for Signing..."
+	# 4. Signing (Automated)
+	echo "4. Configuring Xcode Signing..."
 	XCODE_PROJ="ios/${APP_NAME}.xcodeproj"
-	# Fallback search if variable name logic differs
 	if [ ! -d "$XCODE_PROJ" ]; then
 		XCODE_PROJ=$(find ios -name "*.xcodeproj" | head -n 1)
 	fi
+	PBXPROJ="$XCODE_PROJ/project.pbxproj"
 
-	open "$XCODE_PROJ"
-	read
+	# Set DEVELOPMENT_TEAM in pbxproj
+	if [ -n "$DEVELOPMENT_TEAM" ]; then
+		echo "   Setting DEVELOPMENT_TEAM=$DEVELOPMENT_TEAM"
+		sed -i '' "s/PRODUCT_BUNDLE_IDENTIFIER = /DEVELOPMENT_TEAM = $DEVELOPMENT_TEAM; PRODUCT_BUNDLE_IDENTIFIER = /g" "$PBXPROJ"
+		sed -i '' "s/DEVELOPMENT_TEAM = \"\";/DEVELOPMENT_TEAM = $DEVELOPMENT_TEAM;/g" "$PBXPROJ"
+		sed -i '' "s/DEVELOPMENT_TEAM = ;/DEVELOPMENT_TEAM = $DEVELOPMENT_TEAM;/g" "$PBXPROJ"
+	fi
+
+	# Create/Update entitlements file with App Group
+	ENTITLEMENTS_FILE="ios/${APP_NAME}/${APP_NAME}.entitlements"
+	if [ -n "$APP_GROUP" ]; then
+		echo "   Setting APP_GROUP=$APP_GROUP"
+		cat > "$ENTITLEMENTS_FILE" << EOF
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>aps-environment</key>
+	<string>production</string>
+	<key>com.apple.security.application-groups</key>
+	<array>
+		<string>${APP_GROUP}</string>
+	</array>
+</dict>
+</plist>
+EOF
+		if ! grep -q "CODE_SIGN_ENTITLEMENTS" "$PBXPROJ"; then
+			sed -i '' "s/DEVELOPMENT_TEAM = $DEVELOPMENT_TEAM;/DEVELOPMENT_TEAM = $DEVELOPMENT_TEAM; CODE_SIGN_ENTITLEMENTS = ${APP_NAME}\\/${APP_NAME}.entitlements;/g" "$PBXPROJ"
+		fi
+	fi
+
+	echo "✅ Signing configured automatically"
+
+	# (Old manual step - commented out)
+	# open "$XCODE_PROJ"
+	# read
 }
 
 case $1 in
@@ -84,6 +118,7 @@ xcodebuild -workspace "$WORKSPACE" \
   -configuration Release \
   -archivePath "$BUILD_DIR/${APP_NAME}.xcarchive" \
   -allowProvisioningUpdates \
+		DEVELOPMENT_TEAM="$DEVELOPMENT_TEAM" \
   archive 2>&1 | tee "$BUILD_DIR/build.log"
 
 # アーカイブ成功確認
diff --git a/ios/preview.zsh b/ios/preview.zsh
index 070c575..9c0c88b 100755
--- a/ios/preview.zsh
+++ b/ios/preview.zsh
@@ -48,25 +48,62 @@ cd ios
 pod install
 cd ..
 
-# 4. Signing (Manual Step)
-echo "4. Opening Xcode for Signing..."
+# 4. Signing (Automated)
+echo "4. Configuring Xcode Signing..."
 XCODE_PROJ="ios/${APP_NAME}.xcodeproj"
-# Fallback search if variable name logic differs
 if [ ! -d "$XCODE_PROJ" ]; then
     XCODE_PROJ=$(find ios -name "*.xcodeproj" | head -n 1)
 fi
+PBXPROJ="$XCODE_PROJ/project.pbxproj"
 
-open "$XCODE_PROJ"
-echo "========================================================"
-echo " [ACTION REQUIRED] "
-echo " Xcode opened ($XCODE_PROJ)."
-echo " 1. Go to 'Signing & Capabilities' tab."
-echo " 2. Select your Team."
-echo " 3. Verify 'App Clip' target is gone."
-echo " 4. Ensure no red errors exist."
-echo " Press ENTER here once you are done to continue building."
-echo "========================================================"
-read
+# Set DEVELOPMENT_TEAM in pbxproj
+if [ -n "$DEVELOPMENT_TEAM" ]; then
+    echo "   Setting DEVELOPMENT_TEAM=$DEVELOPMENT_TEAM"
+    # Add DEVELOPMENT_TEAM to all build configurations
+    sed -i '' "s/PRODUCT_BUNDLE_IDENTIFIER = /DEVELOPMENT_TEAM = $DEVELOPMENT_TEAM; PRODUCT_BUNDLE_IDENTIFIER = /g" "$PBXPROJ"
+    # Also set where it might already exist but be empty
+    sed -i '' "s/DEVELOPMENT_TEAM = \"\";/DEVELOPMENT_TEAM = $DEVELOPMENT_TEAM;/g" "$PBXPROJ"
+    sed -i '' "s/DEVELOPMENT_TEAM = ;/DEVELOPMENT_TEAM = $DEVELOPMENT_TEAM;/g" "$PBXPROJ"
+fi
+
+# Create/Update entitlements file with App Group
+ENTITLEMENTS_FILE="ios/${APP_NAME}/${APP_NAME}.entitlements"
+if [ -n "$APP_GROUP" ]; then
+    echo "   Setting APP_GROUP=$APP_GROUP"
+    cat > "$ENTITLEMENTS_FILE" << EOF
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>aps-environment</key>
+    <string>development</string>
+    <key>com.apple.security.application-groups</key>
+    <array>
+        <string>${APP_GROUP}</string>
+    </array>
+</dict>
+</plist>
+EOF
+    # Add CODE_SIGN_ENTITLEMENTS to pbxproj if not present
+    if ! grep -q "CODE_SIGN_ENTITLEMENTS" "$PBXPROJ"; then
+        sed -i '' "s/DEVELOPMENT_TEAM = $DEVELOPMENT_TEAM;/DEVELOPMENT_TEAM = $DEVELOPMENT_TEAM; CODE_SIGN_ENTITLEMENTS = ${APP_NAME}\\/${APP_NAME}.entitlements;/g" "$PBXPROJ"
+    fi
+fi
+
+echo "✅ Signing configured automatically"
+
+# (Old manual step - commented out)
+# open "$XCODE_PROJ"
+# echo "========================================================"
+# echo " [ACTION REQUIRED] "
+# echo " Xcode opened ($XCODE_PROJ)."
+# echo " 1. Go to 'Signing & Capabilities' tab."
+# echo " 2. Select your Team."
+# echo " 3. Verify 'App Clip' target is gone."
+# echo " 4. Ensure no red errors exist."
+# echo " Press ENTER here once you are done to continue building."
+# echo "========================================================"
+# read
 
 # 5. Run
 echo "5. Building and Running..."