Much of Agile is simply about common sense. Do what is needed when it is needed!
Most of the real value of Agile methods is in how it enables us to knock the rust off old ways of working. The revelation that software development needs “people centric” is, in fact, no revelation at all.
The really big news is that developers need to engage in with the business. Oddly, this is the message that the vast majority of agilista’s fail to deliver to, failing to properly engage the business in the agile development process!