I was preparing a new release of my German verb-conjugation iOS app, Konjugieren, and I noticed something strange about its on-device AI tutor. The tutor would occasionally produce a polite German refusal, “Ich kann dir keine Filmempfehlungen machen…”, and then render that refusal inside the speech bubble as if it were a verb-conjugation lesson. The user, who had asked something perfectly reasonable, would see the refusal appear in the conversation as a totally normal-looking response. There was no error and no fallback. The model had simply declined, and the app had presented the decline as if it were content.

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The single highest-leverage practice in agentic iOS coding, as of mid-2026, is the one Anthropic’s Best Practices for Claude Code names directly: “Give Claude a way to verify its work.” On the iOS side, that practice has been hard to apply. I have built a Claude Code skill called ios-build-verify that makes it cheap.

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Default SwiftUI is the iOS equivalent of AI slop. Left to its own defaults, a general-purpose coding assistant will hand you .body fonts everywhere, flat black or white backgrounds, list rows that run edge-to-edge without structural framing, and screens that look indistinguishable from, for example, the kind of toy app one builds while learning the primitives of SwiftUI. I have created the iOS Design Agent Skill to give Claude Code, Cursor, and the other Agent Skills-aware tools a design critic’s eye when they build or audit iOS interfaces.

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