Accessing the KB is really simple. As said, you can add knowledge, delete it, or make query for it.

		#Inserts a Knowledge
		agent.addBelieve(expr("value(1)"))

		#Deletes a Knowledge
		agent.removeBelieve(expr("value(2)"))

		#Ask for a Knowledge
		agent.askBelieve(expr("value(1)"))
		True

		agent.askBelieve(expr("value(X)"))
		True