feat: Add Swift SDK for MCP Apps

Swift SDK for hosting MCP Apps in iOS/macOS applications:

SDK (swift/):
- AppBridge: Host-side protocol handler
- WKWebViewTransport: WebView communication
- Generated types from schema.json
- Full MCP Apps protocol support

Example App (examples/basic-host-swift/):
- SwiftUI app demonstrating SDK usage
- Bottom toolbar UI (server/tool pickers)
- WebView with AppBridge integration
- Tool forwarding to MCP servers
- Server name displayed in tool call cards

Type Generator:
- scripts/generate-swift-types.ts
- Generates Swift types from JSON Schema

CI:
- Swift job on macos-latest
- Builds and tests SDK

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: ochafik

.github/workflows/ci.yml

@@ -36,3 +36,37 @@ jobs:
       - run: npm test
 
       - run: npm run prettier
+
+  swift:
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Build Swift SDK
+        working-directory: swift
+        run: swift build
+
+      - name: Test Swift SDK
+        working-directory: swift
+        run: swift test
+
+  kotlin:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
+        with:
+          java-version: "21"
+          distribution: "temurin"
+
+      - name: Build Kotlin SDK
+        working-directory: kotlin
+        run: |
+          chmod +x gradlew
+          ./gradlew build
+
+      - name: Test Kotlin SDK
+        working-directory: kotlin
+        run: ./gradlew test

.prettierignore

@@ -4,3 +4,13 @@ examples/basic-server-react/**/*.ts
 examples/basic-server-react/**/*.tsx
 examples/basic-server-vanillajs/**/*.ts
 examples/basic-server-vanillajs/**/*.tsx
+
+# Swift package manager build artifacts
+sdk/swift/.build/
+examples/basic-host-swift/.build/
+examples/basic-host-swift/build/
+examples/basic-host-kotlin/.gradle/
+examples/basic-host-kotlin/build/
+
+# Swift build artifacts
+swift/.build/

examples/basic-host-swift/.gitignore

@@ -0,0 +1,34 @@
+# Xcode
+.DS_Store
+*/build/*
+*.pbxuser
+!default.pbxuser
+*.mode1v3
+!default.mode1v3
+*.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3
+xcuserdata/
+*.xccheckout
+*.moved-aside
+DerivedData/
+*.hmap
+*.ipa
+*.xcuserstate
+project.xcworkspace/
+
+# Swift Package Manager
+.build/
+.swiftpm/
+
+# CocoaPods
+Pods/
+
+# Intermediate outputs
+intermediate-outputs/
+build/
+.build/
+*.xcodeproj/
+DerivedData/
+Package.resolved

examples/basic-host-swift/Package.swift

@@ -0,0 +1,32 @@
+// swift-tools-version: 6.0
+import PackageDescription
+
+let package = Package(
+    name: "BasicHostSwift",
+    platforms: [
+        .iOS(.v16),
+        .macOS(.v13)
+    ],
+    products: [
+        .executable(
+            name: "BasicHostSwift",
+            targets: ["BasicHostApp"]
+        ),
+    ],
+    dependencies: [
+        // Local MCP Apps Swift SDK
+        .package(path: "../../swift"),
+        // MCP Swift SDK for MCP client (using spec-update branch with _meta support)
+        .package(url: "https://github.com/ajevans99/swift-sdk.git", branch: "spec-update"),
+    ],
+    targets: [
+        .executableTarget(
+            name: "BasicHostApp",
+            dependencies: [
+                .product(name: "McpApps", package: "swift"),
+                .product(name: "MCP", package: "swift-sdk"),
+            ],
+            path: "Sources/BasicHostApp"
+        ),
+    ]
+)