Apple updated Xcode to version 26.3: software agents can now work with files, assemblies, and project previews

Apple released an Xcode 26.3 update with extended support for software agents like Claude and Codex. In the new version, these systems are able to search documentation, view file structures, change project settings, as well as fix Xcode Preview and work with assembly iterations.

What is known

Agents are added through a new Intelligence section in the application settings. After selecting a provider, such as OpenAI or Anthropic, the user can specify the desired model, including choosing GPT-5.1 instead of GPT-5.2.

Integration of Claude and Codex is realized through the Model Context Protocol (MCP), which allows large language models to exchange data with development environments. MCP was implemented by Anthropic in the fall of 2024, and later supported by OpenAI.

According to Apple, the implementation of MCP allows connecting any agent with this protocol support. Xcode 26.3 is already available for Apple Developer Program participants, and the release on the Mac App Store is announced soon.

Source: Apple