dsh-apple-mode

When you work with Swift on macOS, you often want your AI session to operate the Xcode project directly—tweak a target build setting, switch schemes, list compiler errors from the Navigator, edit String Catalog entries. But bolting 26 Xcode MCP tools onto every DSH session means each round-trip carries 6000-plus tokens of tool schema, and the vast majority of ordinary chats pay that price for nothing. dsh-apple-mode packages the whole stack into an opt-in agent preset: select Apple Mode when creating a session and the full Xcode AI toolset loads; leave it unselected and the session stays lean with virtually zero extra token cost.

The preset bundles three layers of capability. The execution layer exposes 26 mcp__xcode__ tools via Apple's official mcpbridge, covering project file read/write/move, Glob and Grep search, target creation and build-setting edits, scheme and run-destination switching, test-plan management, code-issue refresh, and String Catalog editing. The knowledge layer generates 10 Apple platform skills locally from your own Xcode install—SwiftUI specialist, SwiftUI 27 what's new, App Intents, security hardening, C bounds safety, UIKit modernization, test modernization, device interaction, and document-based SwiftUI apps—loaded lazily on demand so they never sit idle in the context window. The behaviour layer embeds a persona adapted from the Xcode Intelligence prompt templates: Swift-first, tool-assisted, explain-then-change, giving each session a working rhythm that mirrors how you code inside Xcode.

The preset is aimed at macOS developers who use DeepSeek Harness for daily iOS or macOS work and want the AI to participate in project-structure operations rather than just chat out code snippets. You do not need to memorise 26 tool names or wire an MCP server globally; one click on Apple Mode when you need it, and the entire toolchain is ready. Every other session stays untouched.