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Build Information

Failed to build mcp-stdio-swift, reference main (1a5e0b), with Swift 6.3 for iOS using Xcode 26.4 on 18 Apr 2026 03:45:05 UTC.

Build Command

env DEVELOPER_DIR=/Applications/Xcode-26.4.0.app xcrun xcodebuild -IDEClonedSourcePackagesDirPathOverride=$PWD/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath $PWD/.derivedData build -scheme mcp-stdio-swift -destination generic/platform=iOS

Build Log

========================================
RunAll
========================================
Builder version: 4.70.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/xbill9/mcp-stdio-swift.git
Reference: main
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/xbill9/mcp-stdio-swift
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at 1a5e0bc add settings.json for gemini cli
Cloned https://github.com/xbill9/mcp-stdio-swift.git
Revision (git rev-parse @):
1a5e0bc4601b79bafc196f7e1bd4bca79d0a8227
SUCCESS checkout https://github.com/xbill9/mcp-stdio-swift.git at main
========================================
Build
========================================
Selected platform:         iOS
Swift version:             6.3
Building package at path:  $PWD
https://github.com/xbill9/mcp-stdio-swift.git
Command line invocation:
    /Applications/Xcode-26.4.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -resolvePackageDependencies
Resolve Package Graph
Fetching from https://github.com/swift-server/swift-service-lifecycle.git
Fetching from https://github.com/apple/swift-log.git
Fetching from https://github.com/modelcontextprotocol/swift-sdk
Fetching from https://github.com/mattt/eventsource.git
Fetching from https://github.com/apple/swift-system.git
Fetching from https://github.com/apple/swift-nio.git
Fetching from https://github.com/apple/swift-async-algorithms.git
Fetching from https://github.com/apple/swift-collections.git
Fetching from https://github.com/apple/swift-atomics.git
Creating working copy of package ‘eventsource’
Checking out 1.4.1 of package ‘eventsource’
Creating working copy of package ‘swift-sdk’
Checking out 0.12.0 of package ‘swift-sdk’
Creating working copy of package ‘swift-nio’
Checking out 2.98.0 of package ‘swift-nio’
Creating working copy of package ‘swift-async-algorithms’
Checking out 1.1.3 of package ‘swift-async-algorithms’
Creating working copy of package ‘swift-service-lifecycle’
Checking out 2.11.0 of package ‘swift-service-lifecycle’
Creating working copy of package ‘swift-system’
Checking out 1.6.4 of package ‘swift-system’
Creating working copy of package ‘swift-atomics’
Checking out 1.3.0 of package ‘swift-atomics’
Creating working copy of package ‘swift-log’
Checking out 1.12.0 of package ‘swift-log’
Creating working copy of package ‘swift-collections’
Checking out 1.4.1 of package ‘swift-collections’
Resolve Package Graph
Resolved source packages:
  mcp-stdio-swift: /Users/admin/builder/spi-builder-workspace
  swift-log: https://github.com/apple/swift-log.git @ 1.12.0
  EventSource: https://github.com/mattt/eventsource.git @ 1.4.1
  mcp-swift-sdk: https://github.com/modelcontextprotocol/swift-sdk @ 0.12.0
  swift-service-lifecycle: https://github.com/swift-server/swift-service-lifecycle.git @ 2.11.0
  swift-nio: https://github.com/apple/swift-nio.git @ 2.98.0
  swift-async-algorithms: https://github.com/apple/swift-async-algorithms.git @ 1.1.3
  swift-atomics: https://github.com/apple/swift-atomics.git @ 1.3.0
  swift-collections: https://github.com/apple/swift-collections.git @ 1.4.1
  swift-system: https://github.com/apple/swift-system.git @ 1.6.4
resolved source packages: mcp-stdio-swift, swift-log, EventSource, mcp-swift-sdk, swift-service-lifecycle, swift-nio, swift-async-algorithms, swift-atomics, swift-collections, swift-system
2026-04-17 23:44:41.998 xcodebuild[529:3066] [MT] IDERunDestination: Supported platforms for the buildables in the current scheme is empty.
{
  "dependencies" : [
    {
      "identity" : "swift-sdk",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "0.10.2",
            "upper_bound" : "1.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/modelcontextprotocol/swift-sdk"
    },
    {
      "identity" : "swift-service-lifecycle",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "2.6.0",
            "upper_bound" : "3.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/swift-server/swift-service-lifecycle.git"
    },
    {
      "identity" : "swift-log",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "1.6.0",
            "upper_bound" : "2.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/apple/swift-log.git"
    }
  ],
  "manifest_display_name" : "mcp-stdio-swift",
  "name" : "mcp-stdio-swift",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "macos",
      "version" : "13.0"
    }
  ],
  "products" : [
    {
      "name" : "mcp-stdio-swift",
      "targets" : [
        "mcp-stdio-swift"
      ],
      "type" : {
        "executable" : null
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "mcp_stdio_swiftTests",
      "module_type" : "SwiftTarget",
      "name" : "mcp-stdio-swiftTests",
      "path" : "Tests/mcp-stdio-swiftTests",
      "sources" : [
        "HandlersTests.swift"
      ],
      "target_dependencies" : [
        "mcp-stdio-swift"
      ],
      "type" : "test"
    },
    {
      "c99name" : "mcp_stdio_swift",
      "module_type" : "SwiftTarget",
      "name" : "mcp-stdio-swift",
      "path" : "Sources/mcp-stdio-swift",
      "product_dependencies" : [
        "MCP",
        "ServiceLifecycle",
        "Logging"
      ],
      "product_memberships" : [
        "mcp-stdio-swift"
      ],
      "sources" : [
        "Handlers.swift",
        "JSONLogHandler.swift",
        "MCPService.swift",
        "main.swift"
      ],
      "type" : "executable"
    }
  ],
  "tools_version" : "6.0"
}
{
  "workspace" : {
    "name" : "spi-builder-workspace",
    "schemes" : [
      "mcp-stdio-swift"
    ]
  }
}
2026-04-17 23:44:50.886 xcodebuild[1002:5567] [MT] IDERunDestination: Supported platforms for the buildables in the current scheme is empty.
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-26.4.0.app xcrun xcodebuild -IDEClonedSourcePackagesDirPathOverride=$PWD/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath $PWD/.derivedData build -scheme mcp-stdio-swift -destination generic/platform=iOS
Command line invocation:
    /Applications/Xcode-26.4.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath /Users/admin/builder/spi-builder-workspace/.derivedData build -scheme mcp-stdio-swift -destination generic/platform=iOS
Resolve Package Graph
Resolve Package Graph
Resolved source packages:
  swift-log: https://github.com/apple/swift-log.git @ 1.12.0
  mcp-swift-sdk: https://github.com/modelcontextprotocol/swift-sdk @ 0.12.0
  swift-system: https://github.com/apple/swift-system.git @ 1.6.4
  swift-nio: https://github.com/apple/swift-nio.git @ 2.98.0
  EventSource: https://github.com/mattt/eventsource.git @ 1.4.1
  swift-collections: https://github.com/apple/swift-collections.git @ 1.4.1
  swift-async-algorithms: https://github.com/apple/swift-async-algorithms.git @ 1.1.3
  swift-atomics: https://github.com/apple/swift-atomics.git @ 1.3.0
  mcp-stdio-swift: /Users/admin/builder/spi-builder-workspace
  swift-service-lifecycle: https://github.com/swift-server/swift-service-lifecycle.git @ 2.11.0
ComputePackagePrebuildTargetDependencyGraph
Prepare packages
CreateBuildRequest
SendProjectDescription
CreateBuildOperation
ComputeTargetDependencyGraph
note: Building targets in dependency order
note: Target dependency graph (36 targets)
    Target 'mcp-stdio-swift' in project 'mcp-stdio-swift'
        ➜ Explicit dependency on target 'MCP' in project 'mcp-swift-sdk'
        ➜ Explicit dependency on target 'ServiceLifecycle' in project 'swift-service-lifecycle'
        ➜ Explicit dependency on target 'Logging' in project 'swift-log'
    Target 'ServiceLifecycle' in project 'swift-service-lifecycle'
        ➜ Explicit dependency on target 'ServiceLifecycle' in project 'swift-service-lifecycle'
        ➜ Explicit dependency on target 'ConcurrencyHelpers' in project 'swift-service-lifecycle'
        ➜ Explicit dependency on target 'UnixSignals' in project 'swift-service-lifecycle'
        ➜ Explicit dependency on target 'Logging' in project 'swift-log'
        ➜ Explicit dependency on target 'AsyncAlgorithms' in project 'swift-async-algorithms'
    Target 'ServiceLifecycle' in project 'swift-service-lifecycle'
        ➜ Explicit dependency on target 'ConcurrencyHelpers' in project 'swift-service-lifecycle'
        ➜ Explicit dependency on target 'UnixSignals' in project 'swift-service-lifecycle'
        ➜ Explicit dependency on target 'Logging' in project 'swift-log'
        ➜ Explicit dependency on target 'AsyncAlgorithms' in project 'swift-async-algorithms'
    Target 'AsyncAlgorithms' in project 'swift-async-algorithms'
        ➜ Explicit dependency on target 'AsyncAlgorithms' in project 'swift-async-algorithms'
        ➜ Explicit dependency on target 'OrderedCollections' in project 'swift-collections'
        ➜ Explicit dependency on target 'DequeModule' in project 'swift-collections'
    Target 'AsyncAlgorithms' in project 'swift-async-algorithms'
        ➜ Explicit dependency on target 'OrderedCollections' in project 'swift-collections'
        ➜ Explicit dependency on target 'DequeModule' in project 'swift-collections'
    Target 'OrderedCollections' in project 'swift-collections'
        ➜ Explicit dependency on target 'OrderedCollections' in project 'swift-collections'
        ➜ Explicit dependency on target 'InternalCollectionsUtilities' in project 'swift-collections'
    Target 'OrderedCollections' in project 'swift-collections'
        ➜ Explicit dependency on target 'InternalCollectionsUtilities' in project 'swift-collections'
    Target 'UnixSignals' in project 'swift-service-lifecycle'
        ➜ Explicit dependency on target 'ConcurrencyHelpers' in project 'swift-service-lifecycle'
    Target 'ConcurrencyHelpers' in project 'swift-service-lifecycle' (no dependencies)
    Target 'MCP' in project 'mcp-swift-sdk'
        ➜ Explicit dependency on target 'MCP' in project 'mcp-swift-sdk'
        ➜ Explicit dependency on target 'SystemPackage' in project 'swift-system'
        ➜ Explicit dependency on target 'Logging' in project 'swift-log'
        ➜ Explicit dependency on target 'EventSource' in project 'EventSource'
    Target 'MCP' in project 'mcp-swift-sdk'
        ➜ Explicit dependency on target 'SystemPackage' in project 'swift-system'
        ➜ Explicit dependency on target 'Logging' in project 'swift-log'
        ➜ Explicit dependency on target 'EventSource' in project 'EventSource'
    Target 'EventSource' in project 'EventSource'
        ➜ Explicit dependency on target 'EventSource' in project 'EventSource'
        ➜ Explicit dependency on target 'NIOCore' in project 'swift-nio'
    Target 'EventSource' in project 'EventSource'
        ➜ Explicit dependency on target 'NIOCore' in project 'swift-nio'
    Target 'NIOCore' in project 'swift-nio'
        ➜ Explicit dependency on target 'NIOCore' in project 'swift-nio'
        ➜ Explicit dependency on target 'CNIOAtomics' in project 'swift-nio'
        ➜ Explicit dependency on target 'NIOConcurrencyHelpers' in project 'swift-nio'
        ➜ Explicit dependency on target '_NIOBase64' in project 'swift-nio'
        ➜ Explicit dependency on target 'CNIOOpenBSD' in project 'swift-nio'
        ➜ Explicit dependency on target 'CNIODarwin' in project 'swift-nio'
        ➜ Explicit dependency on target 'CNIOLinux' in project 'swift-nio'
        ➜ Explicit dependency on target 'CNIOWindows' in project 'swift-nio'
        ➜ Explicit dependency on target 'CNIOWASI' in project 'swift-nio'
        ➜ Explicit dependency on target '_NIODataStructures' in project 'swift-nio'
        ➜ Explicit dependency on target 'DequeModule' in project 'swift-collections'
        ➜ Explicit dependency on target 'Atomics' in project 'swift-atomics'
    Target 'NIOCore' in project 'swift-nio'
        ➜ Explicit dependency on target 'CNIOAtomics' in project 'swift-nio'
        ➜ Explicit dependency on target 'NIOConcurrencyHelpers' in project 'swift-nio'
        ➜ Explicit dependency on target '_NIOBase64' in project 'swift-nio'
        ➜ Explicit dependency on target 'CNIOOpenBSD' in project 'swift-nio'
        ➜ Explicit dependency on target 'CNIODarwin' in project 'swift-nio'
        ➜ Explicit dependency on target 'CNIOLinux' in project 'swift-nio'
        ➜ Explicit dependency on target 'CNIOWindows' in project 'swift-nio'
        ➜ Explicit dependency on target 'CNIOWASI' in project 'swift-nio'
        ➜ Explicit dependency on target '_NIODataStructures' in project 'swift-nio'
        ➜ Explicit dependency on target 'DequeModule' in project 'swift-collections'
        ➜ Explicit dependency on target 'Atomics' in project 'swift-atomics'
    Target 'Atomics' in project 'swift-atomics'
        ➜ Explicit dependency on target 'Atomics' in project 'swift-atomics'
        ➜ Explicit dependency on target '_AtomicsShims' in project 'swift-atomics'
    Target 'Atomics' in project 'swift-atomics'
        ➜ Explicit dependency on target '_AtomicsShims' in project 'swift-atomics'
    Target '_AtomicsShims' in project 'swift-atomics' (no dependencies)
    Target 'DequeModule' in project 'swift-collections'
        ➜ Explicit dependency on target 'DequeModule' in project 'swift-collections'
        ➜ Explicit dependency on target 'InternalCollectionsUtilities' in project 'swift-collections'
        ➜ Explicit dependency on target 'ContainersPreview' in project 'swift-collections'
    Target 'DequeModule' in project 'swift-collections'
        ➜ Explicit dependency on target 'InternalCollectionsUtilities' in project 'swift-collections'
        ➜ Explicit dependency on target 'ContainersPreview' in project 'swift-collections'
    Target 'ContainersPreview' in project 'swift-collections'
        ➜ Explicit dependency on target 'InternalCollectionsUtilities' in project 'swift-collections'
    Target 'InternalCollectionsUtilities' in project 'swift-collections' (no dependencies)
    Target '_NIODataStructures' in project 'swift-nio' (no dependencies)
    Target 'CNIOWASI' in project 'swift-nio' (no dependencies)
    Target 'CNIOWindows' in project 'swift-nio' (no dependencies)
    Target 'CNIOLinux' in project 'swift-nio' (no dependencies)
    Target 'CNIODarwin' in project 'swift-nio' (no dependencies)
    Target 'CNIOOpenBSD' in project 'swift-nio' (no dependencies)
    Target '_NIOBase64' in project 'swift-nio' (no dependencies)
    Target 'NIOConcurrencyHelpers' in project 'swift-nio'
        ➜ Explicit dependency on target 'CNIOAtomics' in project 'swift-nio'
    Target 'CNIOAtomics' in project 'swift-nio' (no dependencies)
    Target 'Logging' in project 'swift-log'
        ➜ Explicit dependency on target 'Logging' in project 'swift-log'
    Target 'Logging' in project 'swift-log' (no dependencies)
    Target 'SystemPackage' in project 'swift-system'
        ➜ Explicit dependency on target 'SystemPackage' in project 'swift-system'
        ➜ Explicit dependency on target 'CSystem' in project 'swift-system'
    Target 'SystemPackage' in project 'swift-system'
        ➜ Explicit dependency on target 'CSystem' in project 'swift-system'
    Target 'CSystem' in project 'swift-system' (no dependencies)
GatherProvisioningInputs
CreateBuildDescription
ExecuteExternalTool /Applications/Xcode-26.4.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -v -E -dM -arch arm64 -isysroot /Applications/Xcode-26.4.0.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS26.4.sdk -x c -c /dev/null
ExecuteExternalTool /Applications/Xcode-26.4.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swiftc --version
ExecuteExternalTool /Applications/Xcode-26.4.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -v -E -dM -isysroot /Applications/Xcode-26.4.0.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS26.4.sdk -x c -c /dev/null
ExecuteExternalTool /Applications/Xcode-26.4.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld -version_details
ReadFileContents /Applications/Xcode-26.4.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/share/docc/features.json
Build description signature: 718b3022d5631941f20a2c2bf6ecf2c1
Build description path: /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/XCBuildData/718b3022d5631941f20a2c2bf6ecf2c1.xcbuilddata
error: The package product 'MCP' requires minimum platform version 16.0 for the iOS platform, but this target supports 12.0 (in target 'mcp-stdio-swift' from project 'mcp-stdio-swift')
2026-04-17 23:44:56.926 xcodebuild[1036:5717] [MT] IDERunDestination: Supported platforms for the buildables in the current scheme is empty.
** BUILD FAILED **
The following build commands failed:
	Building workspace spi-builder-workspace with scheme mcp-stdio-swift
(1 failure)
Command line invocation:
    /Applications/Xcode-26.4.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -resolvePackageDependencies
Resolve Package Graph
Resolved source packages:
  swift-nio: https://github.com/apple/swift-nio.git @ 2.98.0
  swift-service-lifecycle: https://github.com/swift-server/swift-service-lifecycle.git @ 2.11.0
  mcp-stdio-swift: /Users/admin/builder/spi-builder-workspace
  swift-collections: https://github.com/apple/swift-collections.git @ 1.4.1
  EventSource: https://github.com/mattt/eventsource.git @ 1.4.1
  mcp-swift-sdk: https://github.com/modelcontextprotocol/swift-sdk @ 0.12.0
  swift-log: https://github.com/apple/swift-log.git @ 1.12.0
  swift-system: https://github.com/apple/swift-system.git @ 1.6.4
  swift-async-algorithms: https://github.com/apple/swift-async-algorithms.git @ 1.1.3
  swift-atomics: https://github.com/apple/swift-atomics.git @ 1.3.0
resolved source packages: swift-nio, swift-service-lifecycle, mcp-stdio-swift, swift-collections, EventSource, mcp-swift-sdk, swift-log, swift-system, swift-async-algorithms, swift-atomics
2026-04-17 23:45:00.916 xcodebuild[1180:6387] [MT] IDERunDestination: Supported platforms for the buildables in the current scheme is empty.
{
  "dependencies" : [
    {
      "identity" : "swift-sdk",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "0.10.2",
            "upper_bound" : "1.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/modelcontextprotocol/swift-sdk"
    },
    {
      "identity" : "swift-service-lifecycle",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "2.6.0",
            "upper_bound" : "3.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/swift-server/swift-service-lifecycle.git"
    },
    {
      "identity" : "swift-log",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "1.6.0",
            "upper_bound" : "2.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/apple/swift-log.git"
    }
  ],
  "manifest_display_name" : "mcp-stdio-swift",
  "name" : "mcp-stdio-swift",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "macos",
      "version" : "13.0"
    }
  ],
  "products" : [
    {
      "name" : "mcp-stdio-swift",
      "targets" : [
        "mcp-stdio-swift"
      ],
      "type" : {
        "executable" : null
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "mcp_stdio_swiftTests",
      "module_type" : "SwiftTarget",
      "name" : "mcp-stdio-swiftTests",
      "path" : "Tests/mcp-stdio-swiftTests",
      "sources" : [
        "HandlersTests.swift"
      ],
      "target_dependencies" : [
        "mcp-stdio-swift"
      ],
      "type" : "test"
    },
    {
      "c99name" : "mcp_stdio_swift",
      "module_type" : "SwiftTarget",
      "name" : "mcp-stdio-swift",
      "path" : "Sources/mcp-stdio-swift",
      "product_dependencies" : [
        "MCP",
        "ServiceLifecycle",
        "Logging"
      ],
      "product_memberships" : [
        "mcp-stdio-swift"
      ],
      "sources" : [
        "Handlers.swift",
        "JSONLogHandler.swift",
        "MCPService.swift",
        "main.swift"
      ],
      "type" : "executable"
    }
  ],
  "tools_version" : "6.0"
}
{
  "workspace" : {
    "name" : "spi-builder-workspace",
    "schemes" : [
      "mcp-stdio-swift"
    ]
  }
}
2026-04-17 23:45:02.560 xcodebuild[1217:6571] [MT] IDERunDestination: Supported platforms for the buildables in the current scheme is empty.
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-26.4.0.app xcrun xcodebuild -IDEClonedSourcePackagesDirPathOverride=$PWD/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath $PWD/.derivedData build -scheme mcp-stdio-swift -destination generic/platform=iOS
Command line invocation:
    /Applications/Xcode-26.4.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath /Users/admin/builder/spi-builder-workspace/.derivedData build -scheme mcp-stdio-swift -destination generic/platform=iOS
Resolve Package Graph
Resolved source packages:
  swift-async-algorithms: https://github.com/apple/swift-async-algorithms.git @ 1.1.3
  swift-collections: https://github.com/apple/swift-collections.git @ 1.4.1
  swift-nio: https://github.com/apple/swift-nio.git @ 2.98.0
  mcp-swift-sdk: https://github.com/modelcontextprotocol/swift-sdk @ 0.12.0
  swift-service-lifecycle: https://github.com/swift-server/swift-service-lifecycle.git @ 2.11.0
  swift-atomics: https://github.com/apple/swift-atomics.git @ 1.3.0
  EventSource: https://github.com/mattt/eventsource.git @ 1.4.1
  swift-log: https://github.com/apple/swift-log.git @ 1.12.0
  swift-system: https://github.com/apple/swift-system.git @ 1.6.4
  mcp-stdio-swift: /Users/admin/builder/spi-builder-workspace
ComputePackagePrebuildTargetDependencyGraph
Prepare packages
CreateBuildRequest
SendProjectDescription
CreateBuildOperation
ComputeTargetDependencyGraph
note: Building targets in dependency order
note: Target dependency graph (36 targets)
    Target 'mcp-stdio-swift' in project 'mcp-stdio-swift'
        ➜ Explicit dependency on target 'MCP' in project 'mcp-swift-sdk'
        ➜ Explicit dependency on target 'ServiceLifecycle' in project 'swift-service-lifecycle'
        ➜ Explicit dependency on target 'Logging' in project 'swift-log'
    Target 'ServiceLifecycle' in project 'swift-service-lifecycle'
        ➜ Explicit dependency on target 'ServiceLifecycle' in project 'swift-service-lifecycle'
        ➜ Explicit dependency on target 'ConcurrencyHelpers' in project 'swift-service-lifecycle'
        ➜ Explicit dependency on target 'UnixSignals' in project 'swift-service-lifecycle'
        ➜ Explicit dependency on target 'Logging' in project 'swift-log'
        ➜ Explicit dependency on target 'AsyncAlgorithms' in project 'swift-async-algorithms'
    Target 'ServiceLifecycle' in project 'swift-service-lifecycle'
        ➜ Explicit dependency on target 'ConcurrencyHelpers' in project 'swift-service-lifecycle'
        ➜ Explicit dependency on target 'UnixSignals' in project 'swift-service-lifecycle'
        ➜ Explicit dependency on target 'Logging' in project 'swift-log'
        ➜ Explicit dependency on target 'AsyncAlgorithms' in project 'swift-async-algorithms'
    Target 'AsyncAlgorithms' in project 'swift-async-algorithms'
        ➜ Explicit dependency on target 'AsyncAlgorithms' in project 'swift-async-algorithms'
        ➜ Explicit dependency on target 'OrderedCollections' in project 'swift-collections'
        ➜ Explicit dependency on target 'DequeModule' in project 'swift-collections'
    Target 'AsyncAlgorithms' in project 'swift-async-algorithms'
        ➜ Explicit dependency on target 'OrderedCollections' in project 'swift-collections'
        ➜ Explicit dependency on target 'DequeModule' in project 'swift-collections'
    Target 'OrderedCollections' in project 'swift-collections'
        ➜ Explicit dependency on target 'OrderedCollections' in project 'swift-collections'
        ➜ Explicit dependency on target 'InternalCollectionsUtilities' in project 'swift-collections'
    Target 'OrderedCollections' in project 'swift-collections'
        ➜ Explicit dependency on target 'InternalCollectionsUtilities' in project 'swift-collections'
    Target 'UnixSignals' in project 'swift-service-lifecycle'
        ➜ Explicit dependency on target 'ConcurrencyHelpers' in project 'swift-service-lifecycle'
    Target 'ConcurrencyHelpers' in project 'swift-service-lifecycle' (no dependencies)
    Target 'MCP' in project 'mcp-swift-sdk'
        ➜ Explicit dependency on target 'MCP' in project 'mcp-swift-sdk'
        ➜ Explicit dependency on target 'SystemPackage' in project 'swift-system'
        ➜ Explicit dependency on target 'Logging' in project 'swift-log'
        ➜ Explicit dependency on target 'EventSource' in project 'EventSource'
    Target 'MCP' in project 'mcp-swift-sdk'
        ➜ Explicit dependency on target 'SystemPackage' in project 'swift-system'
        ➜ Explicit dependency on target 'Logging' in project 'swift-log'
        ➜ Explicit dependency on target 'EventSource' in project 'EventSource'
    Target 'EventSource' in project 'EventSource'
        ➜ Explicit dependency on target 'EventSource' in project 'EventSource'
        ➜ Explicit dependency on target 'NIOCore' in project 'swift-nio'
    Target 'EventSource' in project 'EventSource'
        ➜ Explicit dependency on target 'NIOCore' in project 'swift-nio'
    Target 'NIOCore' in project 'swift-nio'
        ➜ Explicit dependency on target 'NIOCore' in project 'swift-nio'
        ➜ Explicit dependency on target 'CNIOAtomics' in project 'swift-nio'
        ➜ Explicit dependency on target 'NIOConcurrencyHelpers' in project 'swift-nio'
        ➜ Explicit dependency on target '_NIOBase64' in project 'swift-nio'
        ➜ Explicit dependency on target 'CNIOOpenBSD' in project 'swift-nio'
        ➜ Explicit dependency on target 'CNIODarwin' in project 'swift-nio'
        ➜ Explicit dependency on target 'CNIOLinux' in project 'swift-nio'
        ➜ Explicit dependency on target 'CNIOWindows' in project 'swift-nio'
        ➜ Explicit dependency on target 'CNIOWASI' in project 'swift-nio'
        ➜ Explicit dependency on target '_NIODataStructures' in project 'swift-nio'
        ➜ Explicit dependency on target 'DequeModule' in project 'swift-collections'
        ➜ Explicit dependency on target 'Atomics' in project 'swift-atomics'
    Target 'NIOCore' in project 'swift-nio'
        ➜ Explicit dependency on target 'CNIOAtomics' in project 'swift-nio'
        ➜ Explicit dependency on target 'NIOConcurrencyHelpers' in project 'swift-nio'
        ➜ Explicit dependency on target '_NIOBase64' in project 'swift-nio'
        ➜ Explicit dependency on target 'CNIOOpenBSD' in project 'swift-nio'
        ➜ Explicit dependency on target 'CNIODarwin' in project 'swift-nio'
        ➜ Explicit dependency on target 'CNIOLinux' in project 'swift-nio'
        ➜ Explicit dependency on target 'CNIOWindows' in project 'swift-nio'
        ➜ Explicit dependency on target 'CNIOWASI' in project 'swift-nio'
        ➜ Explicit dependency on target '_NIODataStructures' in project 'swift-nio'
        ➜ Explicit dependency on target 'DequeModule' in project 'swift-collections'
        ➜ Explicit dependency on target 'Atomics' in project 'swift-atomics'
    Target 'Atomics' in project 'swift-atomics'
        ➜ Explicit dependency on target 'Atomics' in project 'swift-atomics'
        ➜ Explicit dependency on target '_AtomicsShims' in project 'swift-atomics'
    Target 'Atomics' in project 'swift-atomics'
        ➜ Explicit dependency on target '_AtomicsShims' in project 'swift-atomics'
    Target '_AtomicsShims' in project 'swift-atomics' (no dependencies)
    Target 'DequeModule' in project 'swift-collections'
        ➜ Explicit dependency on target 'DequeModule' in project 'swift-collections'
        ➜ Explicit dependency on target 'InternalCollectionsUtilities' in project 'swift-collections'
        ➜ Explicit dependency on target 'ContainersPreview' in project 'swift-collections'
    Target 'DequeModule' in project 'swift-collections'
        ➜ Explicit dependency on target 'InternalCollectionsUtilities' in project 'swift-collections'
        ➜ Explicit dependency on target 'ContainersPreview' in project 'swift-collections'
    Target 'ContainersPreview' in project 'swift-collections'
        ➜ Explicit dependency on target 'InternalCollectionsUtilities' in project 'swift-collections'
    Target 'InternalCollectionsUtilities' in project 'swift-collections' (no dependencies)
    Target '_NIODataStructures' in project 'swift-nio' (no dependencies)
    Target 'CNIOWASI' in project 'swift-nio' (no dependencies)
    Target 'CNIOWindows' in project 'swift-nio' (no dependencies)
    Target 'CNIOLinux' in project 'swift-nio' (no dependencies)
    Target 'CNIODarwin' in project 'swift-nio' (no dependencies)
    Target 'CNIOOpenBSD' in project 'swift-nio' (no dependencies)
    Target '_NIOBase64' in project 'swift-nio' (no dependencies)
    Target 'NIOConcurrencyHelpers' in project 'swift-nio'
        ➜ Explicit dependency on target 'CNIOAtomics' in project 'swift-nio'
    Target 'CNIOAtomics' in project 'swift-nio' (no dependencies)
    Target 'Logging' in project 'swift-log'
        ➜ Explicit dependency on target 'Logging' in project 'swift-log'
    Target 'Logging' in project 'swift-log' (no dependencies)
    Target 'SystemPackage' in project 'swift-system'
        ➜ Explicit dependency on target 'SystemPackage' in project 'swift-system'
        ➜ Explicit dependency on target 'CSystem' in project 'swift-system'
    Target 'SystemPackage' in project 'swift-system'
        ➜ Explicit dependency on target 'CSystem' in project 'swift-system'
    Target 'CSystem' in project 'swift-system' (no dependencies)
GatherProvisioningInputs
CreateBuildDescription
ExecuteExternalTool /Applications/Xcode-26.4.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -v -E -dM -arch arm64 -isysroot /Applications/Xcode-26.4.0.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS26.4.sdk -x c -c /dev/null
ExecuteExternalTool /Applications/Xcode-26.4.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swiftc --version
ExecuteExternalTool /Applications/Xcode-26.4.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -v -E -dM -isysroot /Applications/Xcode-26.4.0.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS26.4.sdk -x c -c /dev/null
ExecuteExternalTool /Applications/Xcode-26.4.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld -version_details
ReadFileContents /Applications/Xcode-26.4.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/share/docc/features.json
Build description signature: 718b3022d5631941f20a2c2bf6ecf2c1
Build description path: /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/XCBuildData/718b3022d5631941f20a2c2bf6ecf2c1.xcbuilddata
error: The package product 'MCP' requires minimum platform version 16.0 for the iOS platform, but this target supports 12.0 (in target 'mcp-stdio-swift' from project 'mcp-stdio-swift')
2026-04-17 23:45:03.850 xcodebuild[1247:6689] [MT] IDERunDestination: Supported platforms for the buildables in the current scheme is empty.
** BUILD FAILED **
The following build commands failed:
	Building workspace spi-builder-workspace with scheme mcp-stdio-swift
(1 failure)
BUILD FAILURE 6.3 iOS