Toolkit is a source filter, so the usual caveats apply.

I personally like explicit module mention, too, but I have

package y;
use Exporter qw (import );
our @EXPORT = qw ( &foo ); # exported functions 
my $callpack  = ( caller )[0];
eval <<"EOH";
package $callpack;
use Data::Dumper;
use B::Deparse;
# other modules...

EOH

sub foo { ... }
1;
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which allows me to

#!/usr/bin/Perl
use strict; use warnings;
use y;
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or on the command line

qwurx [shmem] ~> perl -My -nle 'dwim $_' somefile
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having all defaults in place. Pragmas like strict and warnings should always be explicit.

Thank you for your answer. Toolkit could be an option. I would prefer to have something similar to Toolkit. I need to have those obligatory modules only for some projects and not for each and every one.