That's the wonderful thing about the Agile Manifesto - it says so little you can use it to justify anything.

Specs? The agile manifesto never said to stop writing specs!

Standups? Checmkate waterfallists, the agile manifesto never mentioned that!

Real software engineers have written written real papers on these things. We can forego the manifesto, which is just a few platitudes from consultants on a website.