Missing pagination support in Tenable.io agent_groups.details
When you use pyTenable to fetch details of an agent group, you are limited to a list of only the first 50 member agents. This is because per the API docs, the "agents" field is paginated - you must specify offset, limit, sort, filter, etc. to get everything. However, there is no way in pyTenable to supply any of those arguments to agent_groups.details(). The only two documented arguments are group_id and scanner_id, and the source code confirms that nothing else can be passed.

https://developer.tenable.com/reference#agent-groups-details
https://pytenable.readthedocs.io/en/latest/io.html#tenable.io.agent_groups.AgentGroupsAPI.details
https://pytenable.readthedocs.io/en/latest/_modules/tenable/io/agent_groups.html#AgentGroupsAPI.details

I would suggest that a possible solution would be for functions like this one to accept arbitrary named parameters. In the case where they don't know how to deal with the natively, they would pass them through unmodified to the backend API. That would be a major change, however. Alternately, we could simply add pagination support to this specific function, following the example of agents.list(), say.

https://pytenable.readthedocs.io/en/latest/io.html#tenable.io.agents.AgentsAPI.list
diff --git a/tenable/io/agent_groups.py b/tenable/io/agent_groups.py
index 8e362b9..960a5b9 100644
--- a/tenable/io/agent_groups.py
+++ b/tenable/io/agent_groups.py
@@ -181,7 +181,7 @@ class AgentGroupsAPI(TIOEndpoint):
                     self._check('group_id', group_id, int)),
                 json={'items': [self._check('agent_ids', i, int) for i in agent_ids]}).json()
 
-    def details(self, group_id, scanner_id=1):
+    def details(self, group_id, scanner_id=1, *filters, **kw):
         '''
         Retrieve the details about the specified agent group.
 
@@ -189,7 +189,39 @@ class AgentGroupsAPI(TIOEndpoint):
 
         Args:
             group_id (int): The id of the agent group.
-            scanner_id (int, optional): The id of the scanner
+            *filters (tuple, optional):
+                Filters are tuples in the form of ('NAME', 'OPERATOR', 'VALUE').
+                Multiple filters can be used and will filter down the data being
+                returned from the API.
+
+                Examples:
+                    - ``('distro', 'match', 'win')``
+                    - ``('name', 'nmatch', 'home')``
+
+                As the filters may change and sortable fields may change over
+                time, it's highly recommended that you look at the output of
+                the `filters:agents-filters <https://cloud.tenable.com/api#/resources/filters/agents-filters>`_
+                endpoint to get more details.
+            filter_type (str, optional):
+                The filter_type operator determines how the filters are combined
+                together.  ``and`` will inform the API that all of the filter
+                conditions must be met for an agent to be returned, whereas
+                ``or`` would mean that if any of the conditions are met, the
+                agent record will be returned.
+            limit (int, optional):
+                The number of records to retrieve.  Default is 50
+            offset (int, optional):
+                The starting record to retrieve.  Default is 0.
+            scanner_id (int, optional):
+                The identifier the scanner that the agent communicates to.
+            sort (tuple, optional):
+                A tuple of tuples identifying the the field and sort order of
+                the field.
+            wildcard (str, optional):
+                A string to pattern match against all available fields returned.
+            wildcard_fields (list, optional):
+                A list of fields to optionally restrict the wild-card matching
+                to.
 
         Returns:
             :obj:`dict`:
@@ -199,11 +231,70 @@ class AgentGroupsAPI(TIOEndpoint):
             >>> group = tio.agent_groups.details(1)
             >>> pprint(group)
         '''
+        scanner_id = 1
+        limit = 50
+        offset = 0
+        pages = None
+        query = self._parse_filters(filters,
+            self._api.filters.agents_filters(), rtype='colon')
+
+        # Overload the scanner_id with a new value if it has been requested
+        # to do so.
+        if 'scanner_id' in kw:
+            scanner_id = self._check('scanner_id', kw['scanner_id'], int)
+
+        # For the sorting fields, we are converting the tuple that has been
+        # provided to us and converting it into a comma-delimited string with
+        # each field being represented with its sorting order.  e.g. If we are
+        # presented with the following:
+        #
+        #   sort=(('field1', 'asc'), ('field2', 'desc'))
+        #
+        # we will generate the following string:
+        #
+        #   sort=field1:asc,field2:desc
+        #
+        if 'sort' in kw and self._check('sort', kw['sort'], tuple):
+            query['sort'] = ','.join(['{}:{}'.format(
+                self._check('sort_field', i[0], str),
+                self._check('sort_direction', i[1], str, choices=['asc', 'desc'])
+            ) for i in kw['sort']])
+
+        # The filter_type determines how the filters are combined together.
+        # The default is 'and', however you can always explicitly define 'and'
+        # or 'or'.
+        if 'filter_type' in kw and self._check(
+            'filter_type', kw['filter_type'], str, choices=['and', 'or']):
+            query['ft'] = kw['filter_type']
+
+        # The wild-card filter text refers to how the API will pattern match
+        # within all fields, or specific fields using the wildcard_fields param.
+        if 'wildcard' in kw and self._check('wildcard', kw['wildcard'], str):
+            query['w'] = kw['wildcard']
+
+        # The wildcard_fields parameter allows the user to restrict the fields
+        # that the wild-card pattern match pertains to.
+        if 'wildcard_fields' in kw and self._check(
+            'wildcard_fields', kw['wildcard_fields'], list):
+            query['wf'] = ','.join(kw['wildcard_fields'])
+
+        # If the offset was set to something other than the default starting
+        # point of 0, then we will update offset to reflect that.
+        if 'offset' in kw and self._check('offset', kw['offset'], int):
+            query['offset'] = kw['offset']
+
+        # The limit parameter affects how many records at a time we will pull
+        # from the API.  The default in the API is set to 50, however we can
+        # pull any variable amount.
+        if 'limit' in kw and self._check('limit', kw['limit'], int):
+            query['limit'] = kw['limit']
+
         return self._api.get(
             'scanners/{}/agent-groups/{}'.format(
                 self._check('scanner_id', scanner_id, int),
                 self._check('group_id', group_id, int)
-            )).json()
+            ), params=query
+        ).json()
 
     def list(self, scanner_id=1):
         '''
['tenable/io/agent_groups.py']