Perl::Critic is an extensible framework for creating and applying coding
standards to Perl source code. Essentially, it is a static source code
analysis engine. Perl::Critic is distributed with a number of
Perl::Critic::Policy modules that attempt to enforce various coding
guidelines. Most Policy modules are based on Damian Conway's book Perl Best
Practices. However, Perl::Critic is not limited to PBP and will even
support Policies that contradict Conway. You can enable, disable, and
customize those Polices through the Perl::Critic interface. You can also
create new Policy modules that suit your own tastes.

For a command-line interface to Perl::Critic, see the documentation for
perlcritic. If you want to integrate Perl::Critic with your build
process, Test::Perl::Critic provides an interface that is suitable for
test programs. Also, Test::Perl::Critic::Progressive is useful for
gradually applying coding standards to legacy code. For the ultimate
convenience (at the expense of some flexibility) see the criticism
pragma.