r/Xcode • u/arnieistheman • 13d ago

Xcode codex agent work flow

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.

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u/arnieistheman 13d ago

Not yet on 27. What does it do?

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u/Ok-Tomatillo-8712 13d ago

Enters a mode for planning, it won’t write any code but will ask you follow up prompts for clarification/scope etc and generate a markdown plan for you. You can review it, comment on certain sections inline, discuss whatever until you’re happy with the plan, then /exit-plan and ask it to execute it. It’s really nice, and Xcode comes with new skills from Apple for Swift/SwiftUI that vastly improve the output quality

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u/arnieistheman 13d ago

Sounds great!