Apple's Xcode 26.3: Agentic Coding with Claude Agent & Codex

Apple's Xcode 26.3 has agentic coding with Claude Agent and OpenAI's Codex. In this video, I go through my first impressions and show you the actual workflow, from setting up your Anthropic/OpenAI accounts in Xcode settings to using the new tools like build project, documentation search with vector embeddings, SwiftUI preview screenshots, and terminal access via bash. The agents can now do the full feedback loop: build, find errors, fix them, and push to GitHub with co-authored commits. I also demo working with GitHub issues using the gh CLI directly from Xcode and show how plan mode works for feature development. --- Want to build AI-powered iOS apps? Check out my books: Exploring AI for iOS Development: https://academy.rudrank.com/product/ai Exploring AI-Assisted Coding for iOS Development: https://academy.rudrank.com/product/ai-driven-coding --- Support my work by checking out these great apps (Affiliate Links): Astro ASO Tool: https://tryastro.app/?aff=6NqZ6 Screen Studio: https://screen.studio/?aff=6NqZ6 --- Follow my journey: https://x.com/rudrankriyam --- Timestamps: 00:00 - First impressions on Xcode 26.3 agentic coding 00:53 - Setting up OpenAI Codex and Anthropic accounts in Xcode settings 01:46 - Agent settings: internet access, terminal, Xcode tools, MCP 02:28 - Starting a chat with Claude Agent (faster than Codex) 02:58 - Xcode-specific tools overview (build, grep, list directory, tests) 03:39 - Documentation search with vector DB and MLX embeddings 04:12 - WWDC videos as searchable context (future potential) 04:44 - Web fetch, web search, and plan mode tools 05:10 - Live demo: fetching GitHub issues with gh CLI 07:16 - Entering plan mode and exploring project architecture 09:28 - Model options: Opus, Opus + Sonnet, Sonnet 10:01 - Agent designing implementation plan for multi-tool workflow 11:54 - Shameless plug: App Store Connect CLI 14:11 - Starting implementation in a new branch 16:06 - To-do list from plan mode, working on multiple chats 17:49 - Agent creates files, builds project, finds and fixes errors 19:04 - Agent commits and creates PR automatically 20:23 - Testing SwiftUI preview with screenshots 22:20 - Agent iterating on UI issues 23:17 - Comparing to WWDC 2025 Swift Assist promises 24:00 - Agent taking preview screenshots to verify changes 25:46 - Agent improves UI based on feedback 26:38 - Co-authored by Opus 4.5, git push, PR created 27:28 - Final thoughts and upcoming MCP setup video #Xcode #AgenticCoding #ClaudeAgent #Codex #iOSDev #SwiftUI ---