I am not quite sure but I think that the French Academy (Académie française) is the French institution that is the canonical guardian of the French language. (What organization is the official guardian of the French language in France and/or worldwide?). I do know that there was a French Grammar supervised by the French Academy (LA GRAMMAIRE DE L’ACADÉMIE: PAR M. ABEL HERMANT, DÉLÉGUÉ DE L’ACADÉMIE FRANÇAISE, 1930).
Have this grammar ever considered as the official French Grammar? What was the reactions to this work? Is there something relevant but more recent one? Is Grevisse's Le Bon usage considered as the Definite French Grammar?