diff --git a/commands/check.rb b/commands/check.rb
index 99313d6bb..22ed61b1b 100644
--- a/commands/check.rb
+++ b/commands/check.rb
@@ -8,6 +8,9 @@ class Command
   def self.check(name, force)
     local_package = File.join(CREW_LOCAL_REPO_ROOT, 'packages', "#{name}.rb")
     crew_package = File.join(CREW_PACKAGES_PATH, "#{name}.rb")
+    local_filelist = File.join(CREW_LOCAL_REPO_ROOT, 'manifest', ARCH, name[0].to_s, "#{name}.filelist")
+    crew_filelist_path = File.join(CREW_LIB_PATH, 'manifest', ARCH, name[0].to_s)
+    crew_filelist = File.join(crew_filelist_path, "#{name}.filelist")
     local_package_test = File.join(CREW_LOCAL_REPO_ROOT, 'tests', 'package', name[0].to_s, name)
     crew_package_test_path = File.join(CREW_LIB_PATH, 'tests', 'package', name[0].to_s)
     crew_package_test = File.join(crew_package_test_path, name)
@@ -21,7 +24,7 @@ class Command
 
     # Use rubocop to sanitize package file, and let errors get flagged.
     if Kernel.system('rubocop --version', %i[out err] => File::NULL)
-      puts "Using rubocop to sanitize #{local_package}".orange
+      puts "Using rubocop to sanitize #{local_package}".yellow
       # The .rubocop.yml file is found in the rubocop-chromebrew gem
       require_gem('rubocop-chromebrew')
       if File.file?(File.join(CREW_LOCAL_REPO_ROOT, '.rubocop.yml'))
@@ -35,54 +38,56 @@ class Command
       puts 'To install Rubocop, run the following command: '.lightred + "crew #{'re' if PackageUtils.installed?('ruby_rubocop')}install ruby_rubocop".lightblue
     end
 
-    to_copy = force
+    to_copy_package = force
     to_copy_test = force
+    to_copy_filelist = force
+
+    # This pulls the operation from the calling function.
+    operation = caller_locations(1, 2)[0].to_s.split[3].split('_')[0].split('#')[1]
 
     # Prompt to copy the local repo package to crew if the package is not found.
-    unless force || File.file?(crew_package)
-      puts "The crew package '#{name}' does not exist."
-      to_copy = true
+    if !force && File.file?(local_package) && !File.file?(crew_package)
+      puts "The crew package #{crew_package} does not exist.".yellow
+      to_copy_package = true
     end
 
     # Prompt to copy the local repo package test to crew if the package test is not found.
-    if File.file?(local_package_test) && !(force || File.file?(crew_package_test))
-      puts "The crew package test '#{name}' does not exist."
+    if !force && File.file?(local_package_test) && !File.file?(crew_package_test)
+      puts "The crew package test #{crew_package_test} does not exist.".yellow
       to_copy_test = true
     end
 
+    # Prompt to copy the local repo filelist to crew if the filelist is not found.
+    if !force && File.file?(local_filelist) && !File.file?(crew_filelist)
+      puts "The crew filelist #{crew_filelist} does not exist.".yellow
+      to_copy_filelist = true
+    end
+
     # Compare local repo package to the crew repo package and prompt to copy if necessary to prepare for the operation.
-    unless force || (File.file?(crew_package) && FileUtils.identical?(local_package, crew_package))
-      puts "#{local_package} does not match the crew package."
-      to_copy = true
+    if !force && File.file?(local_package) && File.file?(crew_package) && !FileUtils.identical?(local_package, crew_package)
+      puts "#{local_package} does not match the crew package.".yellow
+      to_copy_package = true
     end
 
     # Compare local repo package test to the crew repo package test and prompt to copy if necessary to prepare for the operation.
-    if File.file?(local_package_test) && !(force || (File.file?(crew_package_test) && FileUtils.identical?(local_package_test, crew_package_test)))
-      puts "#{local_package_test} does not match the crew package test."
+    if !force && File.file?(local_package_test) && File.file?(crew_package_test) && !FileUtils.identical?(local_package_test, crew_package_test)
+      puts "#{local_package_test} does not match the crew package test.".yellow
       to_copy_test = true
     end
 
-    if to_copy && !force
-      # This pulls the operation from the calling function.
-      operation = caller_locations(1, 2)[0].to_s.split[3].split('_')[0].split('#')[1]
-      if Package.agree_default_yes("\nWould you like to copy #{name}.rb to crew and start the #{operation}")
-        to_copy = true
-      else
-        return false
-      end
+    # Compare local repo filelist to the crew filelist and prompt to copy if necessary to prepare for the operation.
+    if !force && File.file?(local_filelist) && File.file?(crew_filelist) && !FileUtils.identical?(local_filelist, crew_filelist)
+      puts "#{local_filelist} does not match the crew filelist.".yellow
+      to_copy_filelist = true
     end
 
-    if to_copy_test && !force && File.file?(local_package_test)
-      # This pulls the operation from the calling function.
-      operation = caller_locations(1, 2)[0].to_s.split[3].split('_')[0].split('#')[1]
-      if Package.agree_default_yes("\nWould you like to copy #{local_package_test} to crew and start the #{operation}")
-        to_copy_test = true
-      else
-        return false
-      end
-    end
+    return false if !force && to_copy_package && !Package.agree_default_yes("\nWould you like to copy #{local_package} to crew and start the #{operation}")
 
-    if to_copy
+    return false if !force && to_copy_test && !Package.agree_default_yes("\nWould you like to copy #{local_package_test} to crew and start the #{operation}")
+
+    return false if !force && to_copy_filelist && !Package.agree_default_yes("\nWould you like to copy #{local_filelist} to crew and start the #{operation}")
+
+    if to_copy_package && File.file?(local_package)
       FileUtils.copy_file(local_package, crew_package)
       puts "Copied #{local_package} to #{CREW_PACKAGES_PATH}".lightgreen
     end
@@ -93,10 +98,19 @@ class Command
       puts "Copied #{local_package_test} to #{crew_package_test_path}".lightgreen
     end
 
+    if to_copy_filelist && File.file?(local_filelist)
+      FileUtils.mkdir_p crew_filelist_path unless File.directory?(crew_filelist_path)
+      FileUtils.copy_file(local_filelist, crew_filelist)
+      puts "Copied #{local_filelist} to #{crew_filelist_path}".lightgreen
+    end
+
     # Run property and buildsystem tests on the package, and fail if they fail.
     return false unless system "#{CREW_LIB_PATH}/tests/prop_test #{name}"
     return false unless system "#{CREW_LIB_PATH}/tests/buildsystem_test #{name}"
-    return false if (ARGV[0] == 'check') && File.file?(local_package_test) && !system("#{CREW_LIB_PATH}/tests/package_test #{name}")
+    if ARGV[0] == 'check'
+      return false unless system("#{CREW_LIB_PATH}/tests/library_test #{name}")
+      return false unless system("#{CREW_LIB_PATH}/tests/package_test #{name}")
+    end
 
     # If we're still here every test has passed, so return true.
     return true
diff --git a/lib/const.rb b/lib/const.rb
index cf43aa9f4..9f4587862 100644
--- a/lib/const.rb
+++ b/lib/const.rb
@@ -4,7 +4,7 @@ require 'etc'
 require 'open3'
 
 OLD_CREW_VERSION = defined?(CREW_VERSION) ? CREW_VERSION : '1.0'
-CREW_VERSION = '1.69.0' unless defined?(CREW_VERSION) && CREW_VERSION == OLD_CREW_VERSION
+CREW_VERSION = '1.70.0' unless defined?(CREW_VERSION) && CREW_VERSION == OLD_CREW_VERSION
 
 # Kernel architecture.
 KERN_ARCH = Etc.uname[:machine]
diff --git a/tests/library_test b/tests/library_test
new file mode 100755
index 000000000..f5844a31d
--- /dev/null
+++ b/tests/library_test
@@ -0,0 +1,75 @@
+#!/usr/bin/env ruby
+
+require_relative '../lib/const'
+require_relative '../lib/color'
+require_relative '../lib/package'
+
+# Add >LOCAL< lib to LOAD_PATH so that packages can be loaded
+$LOAD_PATH.unshift File.join(CREW_LIB_PATH, 'lib')
+
+def check_libraries(pkg_path, verbose: false)
+  name = File.basename(pkg_path, '.rb')
+  puts "Checking #{name} package ...".yellow if verbose
+  # If the package is invalid, it will almost certainly raise a NameError when we attempt to load it.
+  begin
+    Package.load_package(pkg_path)
+  rescue NameError => e
+    e.name.to_s
+  end
+
+  filelist = "#{CREW_LIB_PATH}/manifest/#{ARCH}/#{name[0]}/#{name}.filelist"
+  unless File.exist?(filelist)
+    puts "The manifest #{filelist} does not exist.".lightred
+    puts "Library test for #{name} failed.".lightred
+    return 1
+  end
+
+  libraries = `grep -E "^#{CREW_PREFIX}/lib" "#{filelist}" | grep -vE "^#{CREW_PREFIX}/libexec/" | grep -vE "^#{CREW_PREFIX}/lib/perl" | grep -vE "^#{CREW_PREFIX}/lib/python"`.chomp
+  if libraries.empty?
+    puts "Library test for #{name} passed.".lightgreen if verbose
+    return 0
+  else
+    valid_libraries = `grep -E "^#{CREW_LIB_PREFIX}/" "#{filelist}" | grep -vE "^#{CREW_PREFIX}/libexec/" | grep -vE "^#{CREW_PREFIX}/lib/perl" | grep -vE "^#{CREW_PREFIX}/lib/python"`.chomp
+    if valid_libraries.empty?
+      puts 'All libraries:'
+      puts libraries
+      puts 'Invalid library paths.'.lightred
+      puts "Library test for #{name} failed.".lightred
+      return 1
+    elsif libraries != valid_libraries
+      puts 'All libraries:'
+      puts libraries
+      puts 'Valid libraries:'
+      puts valid_libraries
+      puts 'Invalid library paths.'.lightred
+      puts "Library test for #{name} failed.".lightred
+      return 1
+    else
+      puts "Library test for #{name} passed.".lightgreen if verbose
+      return 0
+    end
+  end
+end
+
+if ARGV[0]
+  ARGV.each do |name|
+    if File.file?(File.join(CREW_PACKAGES_PATH, "#{name}.rb"))
+      test_result = check_libraries(File.join(CREW_PACKAGES_PATH, "#{name}.rb"), verbose: true)
+      exit(1) if test_result.positive?
+    else
+      puts "Package #{name} not found.".lightred
+    end
+  end
+else
+  failed_packages = 0
+  Dir["#{CREW_PACKAGES_PATH}/*.rb"].each do |filename|
+    failed_packages += check_libraries(filename)
+  end
+
+  if failed_packages.positive?
+    puts "\n#{failed_packages} packages failed library tests.".lightred
+    exit(1)
+  else
+    puts "\nAll packages passed library tests.".lightgreen
+  end
+end