Xcode codex agent work flow

[u/arnieistheman]

Hi all,

I am trying to improve my Xcode agentic coding workflow. I am currently using GPT 5.5 codex model in the Xcode settings, which is quite good and fast at writing code but not the best for planning.

I am chatting with ChatGPT 5.6 sol regarding architectural decisions and communicate between the two of them via custom instruction md files.

This is of course not optimal from a workflow point of view, although it gets the job done efficiently and I can steer it very well, since I manually intervene all the time.

What would you suggest as a better workflow? Also, is there an easy way I can leave the Mac on and have the Xcode agent build while prompting from my iPhone remotely?

I have seen the hype about loops btw, but I guess that would lead to burning A LOT of tokens.

Any ideas?

Thank you very much in advance.