Apple is making a significant change to how developers manage application projects, introducing a simpler configuration format that makes files easier for both humans and AI coding agents to edit.
The tech giant released the Xcode 27.2 release candidate on Oct. 19, bringing its new JSON-based project configuration format closer to general availability after introducing the feature in beta 2. The format aims to reduce merge conflicts, simplify code reviews, and help AI tools modify project settings more reliably.
However, compatibility concerns involving popular development automation tools could complicate adoption for teams with established workflows.
Apple introduces a simpler format for Xcode projects
According to Apple's official documentation, Xcode 27.2 supports a smaller, hierarchical JSON-based project configuration format that uses .xcproj files instead of the traditional .pbxproj files.
Both formats reside inside the familiar .xcodeproj project package, but they organize configuration settings differently.
Traditional Xcode projects rely on property list files that contain interconnected references and identifiers. Even relatively small changes can produce complicated differences in version control, making collaboration and code reviews more difficult.
Apple says the new structure is designed to address those limitations through three improvements:
- Clearer code reviews: Developers can more easily identify which project settings have changed.
- Reduced merge conflicts: A more organized structure aims to minimize unnecessary conflicts when multiple developers modify project settings.
- Improved AI compatibility: Coding agents can more easily interpret and update configuration files.
Apple says the JSON-based .xcproj format is the default project configuration format in Xcode 27.2 and later. Existing projects can continue using the traditional .pbxproj format or migrate to JSON through the File inspector.
Xcode 27 and later support both formats.
Why AI coding agents could benefit
AI coding assistants can generate source code, identify errors, and implement features, but they also need to interact with project configurations. Adding frameworks, modifying build settings, and adjusting dependencies can require changes to files that are difficult for automated tools to interpret.
Apple's new format aims to make those tasks more manageable by replacing complex references with a more readable hierarchy. The change arrives as AI coding tools expand beyond individual programming tasks.
For example, Microsoft's local AI coding initiative highlights growing interest in tools that give developers more control over AI-assisted programming. Meanwhile, eWeek's reporting on Anthropic's AI agents shows how the expansion of AI-assisted development can create additional demand for human supervision, code review, and decision-making.
Apple's update addresses an underlying requirement for those tools: access to project settings that can be interpreted and modified without introducing unnecessary complexity.
Fastlane compatibility concerns could delay adoption
Developers relying on fastlane should evaluate compatibility before migrating existing projects.
In an Oct. 1 GitHub discussion, a fastlane project member recommended against adopting the new .xcproj format until the project's tooling could support it.
The discussion documents reported failures involving code-signing settings, application identifiers, and version management. The project member indicated that support would require changes to the underlying xcodeproj library and could take months.
In the reported tests, converting the project to .xcproj caused affected fastlane actions to fail because the installed xcodeproj library continued looking for the older project.pbxproj file.
The GitHub report identifies fastlane 2.240.1 and xcodeproj 1.28.1 as the affected tool versions. The failures were reported during the Xcode 27.2 beta cycle, although the precise Xcode build used to reproduce them could not be independently confirmed.
Fastlane subsequently released versions 2.241.0 on Oct. 10 and 2.241.1 on Oct. 15. The original discussion does not establish whether those updates resolve the compatibility problems or whether the same failures persist in the Oct. 19 release candidate.
The issue reporter also noted that Xcode-generated .xcproj files could contain trailing commas. That could cause problems for custom tools relying on strict JSON parsers.
These findings underscore the importance of testing specific tool versions before migrating.
What eWeek found: AI-friendly files don't guarantee AI-ready workflows
Apple's approach highlights an important distinction in the evolution of AI-assisted software development: making project files easier for coding agents to modify does not automatically make the surrounding development environment compatible with those changes.
Three implications stand out:
- AI agents need access beyond source code. As coding tools handle more complex tasks, they must interact reliably with build configurations and project dependencies.
- Tooling support determines adoption. A more readable project format provides limited practical value when essential automation tools cannot process it.
- Governance becomes more important. Allowing AI agents to modify project settings introduces additional reasons to review changes, validate builds, and restrict permissions.
The governance issue is particularly relevant for enterprise development teams. As eWeek previously reported, organizations are increasingly examining how to monitor and govern AI agents operating across business systems.
For CIOs and engineering leaders, Apple's change offers a potential productivity improvement, but the greater opportunity lies in integrating AI agents into existing development processes without compromising reliability or oversight.
What developers should do before switching
Developers using Xcode 27.2 can enable the JSON-based format for existing projects by selecting the project in the Project navigator, opening the File inspector, and choosing JSON under Project Format.
Before adopting it across production workflows, teams should:
- Check compatibility: Confirm that build tools, dependency managers, and automation scripts support .xcproj files.
- Test separately: Convert a copy of the project in a dedicated Git branch.
- Validate workflows: Run builds, tests, code-signing operations, and deployment automation.
- Review changes: Examine configuration differences before merging them into the main development branch.
The release candidate gives development teams an opportunity to evaluate the new format before adopting it across production projects.
For development teams, the immediate question is whether the new format works with their existing toolchain. Testing that compatibility before migration will help determine whether Apple's AI-friendly changes deliver practical benefits without disrupting established workflows.
Related reading: For a deeper look at how autonomous coding tools work and the risks businesses should consider, read eWeek’s Agentic AI Cheat Sheet: A Guide to AI Agents, Tools, and Risks.