Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE Ref_Shipping_Agents ( Id VARCHAR )
TABLE: CREATE TABLE Documents ( Id VARCHAR )

### Question ###
Which shipping agent shipped the most documents? List the shipping agent name and the number of documents.

### Accurate SQL ###

SELECT Ref_Shipping_Agents.shipping_agent_name, COUNT(Documents.document_id) FROM Ref_Shipping_Agents JOIN Documents ON Documents.shipping_agent_code = Ref_Shipping_Agents.shipping_agent_code GROUP BY Ref_Shipping_Agents.shipping_agent_code ORDER BY COUNT(Documents.document_id) DESC LIMIT 1