Xcode 26.3 introduced built-in agentic coding support, integrating Claude Code and Codex directly into the IDE. The author shares first impressions and explains how to configure the three 'core pillars' of their agent workflow — agents.md, skills files, and MCPs — within Xcode's new Codex installation. Key insight: Xcode's Codex is a fresh, separate install with its own config.toml tuned for Apple/iOS development. Skills can be copied over manually, MCPs can be added via config, and agents.md works out of the box. The experience is praised for its native feel and polished UI, though maintaining skills and MCPs across multiple agent installations remains a friction point. The author hopes the community converges on open standards for these configuration files.
