According to http://ogp.me/ description is not required.

README.rst

@@ -58,7 +58,7 @@ Usage
    ... """
    >>> movie = opengraph.OpenGraph() # or you can instantiate as follows: opengraph.OpenGraph(html=HTML)
    >>> movie.parser(HTML)
-   >>> video.is_valid()
+   >>> movie.is_valid()
    True
 
 **Generate JSON or HTML**

opengraph/opengraph.py

@@ -23,7 +23,7 @@ class OpenGraph(dict):
     """
     """
 
-    required_attrs = ['title', 'type', 'image', 'url', 'description']
+    required_attrs = ['title', 'type', 'image', 'url']
 
     def __init__(self, url=None, html=None, scrape=False, **kwargs):
         # If scrape == True, then will try to fetch missing attribtues

opengraph/test.py

@@ -28,6 +28,7 @@ def test_isinstace(self):
     def test_to_html(self):
         og = opengraph.OpenGraph(html=HTML)
         self.assertTrue(og.to_html())
+        self.assertTrue(og.is_valid())
 
     def test_to_json(self):
         og = opengraph.OpenGraph(url='https://www.youtube.com/watch?v=XAyNT2bTFuI')