How to use converge_by in Chef LWRP's. This is from an app cookbook I forked from the main opscode application cookbook but stripped way down.

provider_default.rb

action :deploy do
  before_compile
  before_deploy
  run_deploy
  new_resource.updated_by_last_action(true)
end

protected

def install_packages
  converge_by("install app packages (#{new_resource.packages.length})") do
    new_resource.packages.each do |pkg|
      Chef::Log.warn "Install #{pkg}"
      package pkg do
        action :install
      end
    end
  end
end

def before_compile
  install_packages

  new_resource.app_provider self

  if new_resource.before_compile
    ruby_block "#{new_resource.name} before_compile" do
      block do
        callback(:before_compile, new_resource.before_deploy)
      end
    end
  end

  converge_by("run subresource before_compile hooks (#{new_resource.sub_resources.length})") do
    new_resource.sub_resources.each do |resource|
      resource.app_provider self
      resource.run_action :before_compile
    end
  end
end

def before_deploy
  verify_directories_exist

  if new_resource.before_deploy
    ruby_block "#{new_resource.name} before_deploy" do
      block do
        callback(:before_deploy, new_resource.before_deploy)
      end
    end
  end
end

Are you sure you need converge_by blocks here?