This is a really great post - and what they've built here is very impressive.

I wonder if we're at the point where the cost of building and maintaining this yourselves (assisted with an AI Copilot) is now more effective than an off-the-shelf?

It feels like there's a LOT of moving parts here, but also it's deeply tailored to their own setup.

FWIW - I tried pointing Claude at the post and asking it to design an implementation, (like the post said to do) and it struggled - but perhaps I prompted it wrong.

I had this exact idea, I pointed Codex to it, with giving it context of our environment which is pretty complex. It is struggling, but that is because even our dev experience where I work is not great and not documented, so that would need to be lifted before I can reliably get an agent setup as well integrated as this blog post details.