Your $tag_id variable is not defined before use. Try a test with a fixed value in there:
<p class="klientWlasciciel">WLASCICIEL: <?php echo 'Tag Description: ' . tag_description( '1' ); ?> </p>
… or test the default behavior which should be the current queried tag:
<p class="klientWlasciciel">WLASCICIEL: <?php echo 'Tag Description: ' . tag_description(); ?> </p>
https://codex.wordpress.org/Function_Reference/tag_description
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