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package MyApp::Model::ProblemSolver;
use Moose;
...
  my ($self, $args) = @_;
  return %$args;
}

override 'prepare_arguments' => sub {
  my ($self, $c) = @_; 
...
  my %merged_args = ( %$config_params, %$passed_in_params ); 
  return \%merged_args;
}; # prepare_arguments

$c->stash->{problem_solver_args}{some_param} = $user_input1 if $user_i
+nput1;
...

my $problem_solver = $c->model('ProblemSolver');
my $result = $problem_solver->solve_problem();

Model::ProblemSolver:
  args:
    database: a_database_of_solved_problems
    some_param: SOME_DEFAULT_VALUE