Where does Puppet's environment come from?

Self-training on puppet and wrote the following manifest:

class bratch::test {

  file { '/var/cache/tempFile':
    owner  => 'root',
    group  => 'root',
    mode   => '0644',
    source => "http://puppet${puppetserver}/modules/bratch/tempFile"
  }

  exec { "create_file":
    command => "/bin/echo boop >> /tmp/outputFile",
  }

Works how I expected it but didn't really think about that exec line until after the fact.

If puppet understood the output redirection does that mean it invokes a shell? If so, where does it’s environment come from? Does it initialize the environment each time or does it inherit directly from the puppet agent?