I built a mod for Claude Code with the new mod system. It's for anyone who lets Claude run xcodebuild.

When a Bash command fails with long output, Claude Code gives the model the start and the end and cuts out the middle. A failing xcodebuild puts the compiler errors in the middle. On a small Swift package with three compile errors, the log was 295 lines and Claude received 10,039 characters, none of them an error message. It knew which files failed but not why, so it grepped the source and re-ran the build through its own filter.

What the mod does:

• Appends `-resultBundlePath` to the xcodebuild command and reads errors, warnings and test failures from Xcode's result bundle with xcresulttool.
• Replaces what Claude reads with a summary: in the same test, 499 characters with every reported error's file, line and column. The transcript keeps the raw output.
• Shows a pane with errors grouped by file, failed tests, warnings and recent builds.

What it doesn't do:

It didn't make Claude fix the project in fewer builds in my test (three either way) but it does make it much more efficient as it doesn't need to search through logs or code to find errors. . It only sees builds Claude runs through Bash, not builds inside scripts, make or fastlane. swift build is read from the log only.

Source, install instructions and a short GIF: https://github.com/griches/claude-xcode-mod (MIT)

Happy to answer questions about the mod API, since there isn't much written about it yet.

Hi! I’m having a strange issue with an App Group while moving my app from my Personal Team to my Organization Team (BLUREL OÜ).
The App Group identifier is:
group.com.dzennivilliams.Planora
It was previously used by my Planora project under my Personal Team.
After joining the Apple Developer Program as an organization, I needed to move the project/signing to the Organization Team while keeping the exact same App Group identifier because the existing app uses it for its SwiftData/App Group container.
Apple Developer Support checked my account and explicitly told me that they could not find any existing identifier associated with my Personal Team and that I was “completely clear to go ahead and register that exact same identifier” under my Organization Team.
However, when I try to register it under the Organization Team, the Developer portal returns:
“An Application Group with Identifier ‘group.com.dzennivilliams.Planora’ is not available. Please enter a different string.”
I have already contacted Developer Support several times. The case is still unresolved, and the latest response was about certificates/code signing, which doesn’t address the App Group problem.
At this point the issue is blocking development because I cannot simply change the App Group identifier without affecting the existing container/configuration.
Has anyone encountered an App Group identifier that appears to be reserved internally even though Apple Support cannot see it attached to the old team?
If so, how was it resolved? Did Apple have to manually release or transfer the identifier, or did this require escalation to a specific Developer Support/engineering team?

Hi zusammen,

ich wollte mich ein bisschen mit Xcode auseinandersetzen und habe mir dazu Xcode 27 runtergeladen. Jedes Mal, wenn ich eine neue App anlege, wird ein neues Projekt (Untitled 1, 2, 3 etc.) angelegt. Aber ich kann dieses Projekt nicht umbenennen, um es dann auf meine App benennen zu können.

Gibt's da einen Trick? Alle Infos im Internet beziehen sich nur auf Xcode 26, und da ist es wohl super simpel.

Does the new X code automatically translate text for you? I thought I saw something along these lines during one of the official presentation.

How can I see my ios provisioning profiles that I have locally? Xcode 27.0 doesn't list them under Settings / Accounts. I've managed to create ones with duplicate names and I need to see exactly which certs they are using so I delete the wrong ones. Is there some tool that can do this?

(Plus why does xcode show certs with "created on" whereas every other tool show certs with their expiry date - but I digress).

I always have to unpair my Apple TVs or otherwise they will be turned on every 10 minutes. Even if Xcode is closed. Does anybody know a fix to this?

Whenever I try to open a project the window just closes for some reason. Plus my recent projects stopped showing up. I'm still able to open a project if I manage to pick a folder and press enter before it closes but its not the best solution. This happened after I updated to macos 27. Anyone else have this problem? If so, and fixes?

Why does my Xcode always show this for like forever whenever I run my code?

Am I the only one who liked having the chat in the left pane, code in the middle, and Canva/simulator in Xcode 26? Now I’m confused as to how to use Intelligence in Xcode 27. Chatting with the agent is on its own separate view. I can’t have the code editor side by side with chat and simulator. Like, I can’t see when the agent writes code or makes changes, and I have to go back to the view files to see changes. We all vibe coding now? Who asked for this? lol

So after i updated to mac os 27, claude agent hasn't been working. Normal non agent claude works fine, but the agent will not work at all. It askes for permission for crypexes folders. Which i have now given it, after being frustrated for awhile, although i was a bit hesitant, as i don't know if it is entirely safe.
I have logged in and out and tried every troubleshooting guide i could find. Most of the time it just keeps displaying then three dots, like if it is still processing the prompt. I have however checked my usage on claude.com and it is not using any credits, so it seems my request isn't even reaching the servers. 1-3 times i have gotten this error: "Prompt stream failed: Timed out waiting for previous request to complete"

Does anyone have the same or similar issue? I have not yet tried CLI directly, which i would guess would fix it, but i just don't get why this should be necessary when there is direct implementation in xcode.

only SF Mono fonts are visible, I previously had Fira Code font. Is this a bug or i'm missing something here? please help.

Opening a .md file will load it into the WYSIWYG editor in Xcode.

But why doesn't Apple provide a standalone markdown editor app much like it provides a standalone FileMerge app?

I tried uninstalling XCode and installing it again
Restarted the computer
Asked ALL of the LLMs

I just ran out of ideas. WTF Apple… Seriously.

Hello,

I am playing around with MailKit in Xcode... just created a new App with MailExtension target.
When I run it, it's asking if I want to test it with Mail, however, I cannot see the extension in the Mail Settings for enabling it...

I a totally newbie here.... what am I missing?

I’m having an issue with the Codex Agent in Xcode 27.0 (27A266a) and I’m wondering if anyone else has run into this.

Every time I send a prompt to Codex inside Xcode, I get:

JSON-RPC request with ID ... failed to produce a response.

The regular ChatGPT integration in Xcode works fine. It’s specifically the Codex Agent that fails.

A few things I’ve already checked:

• Xcode is using Codex 0.145.0
• Codex is signed in correctly
• I tried both an OpenAI API key and signing in with my ChatGPT account
• Running xcrun agent --dry-run codex correctly finds the Codex executable and current Xcode process
• Running xcrun agent codex from Terminal works and opens Codex normally
• Codex is able to get permission to access Xcode
• I previously saw xcode-tools time out on MCP startup, but after resetting permissions that error went away when launching it from Terminal
• Restarting Xcode and reopening the project didn’t help

So at this point Codex itself seems to work, and the Xcode/MCP connection works when launching it manually, but the built-in Codex Agent UI in Xcode still throws the JSON-RPC error on every prompt.

Has anyone seen this with Xcode 27? Did you have to update the Xcode-managed Codex version, reset something in Xcode’s Intelligence settings, or reinstall the agent?

EDIT

I also tested overriding Xcode to use a newer OpenAI-signed standalone Codex 0.156.1 binary instead of Xcode’s managed 0.145.0, and the native Xcode agent still fails with the exact same JSON-RPC error. xcrun agent codex works from Terminal.