[Bug]: Device Hub opens for stable Xcode when Xcode 27 beta is co-installed
还没有人认领这个 Issue。
评估
- 难度
- 3/5
- 预计耗时
- 1-2 天
- 新手友好度
- 74/100
- Issue 类型
- 缺陷
- 描述清晰度
- 描述清楚
- 活跃度
- 活跃
- 技术栈
- macos, typescript
- 领域
- mobile-dev, tooling
调研方向
从 src/utils/focus-policy.ts 中的前端候选顺序开始，然后跟踪 src/mcp/tools/simulator/build_run_sim.ts 如何在启动后调用 policy。安装 stable 和 beta Xcode，并让 DEVELOPER_DIR 选择 stable，以复现该问题；完成标准是自动 GUI 启动由所选 Xcode 所拥有的前端，而 headless 模式仍然不会打开任何前端。
由索引模型根据 Issue 内容生成。
描述
Bug Description
When Xcode 26 stable and Xcode 27 beta are installed together, XcodeBuildMCP
2.7.0 opens the beta-only Device Hub even when DEVELOPER_DIR explicitly
selects stable Xcode and the target is an iOS 26.5 simulator.
This crosses the selected toolchain boundary. Stable Xcode 26 ships
Simulator.app; Device Hub is bundled only inside Xcode 27 beta on this host.
The cause appears to be the frontend candidate order in
focus-policy.ts:
the Device Hub candidate is attempted first for every non-headless simulator
launch—via devices:// when a simulator ID is known, or open -a DeviceHub
otherwise—without consulting the active Xcode selected by DEVELOPER_DIR.
Simulator.app is only a fallback if opening Device Hub fails. build_run_sim
invokes this policy automatically after boot.
The same behavior is still present on main as of 2026-08-10.
Debug Output
Platform: macOS 26.5.2 (25F84), arm64
Stable Xcode: 26.6 (17F113)
Beta Xcode: 27.0 (27A5237l)
Selected DEVELOPER_DIR: /Applications/Xcode.app/Contents/Developer
XcodeBuildMCP: 2.7.0
Codex CLI: 0.144.1
Stable frontend:
/Applications/Xcode.app/Contents/Developer/Applications/Simulator.app
bundle id: com.apple.iphonesimulator
Beta frontend:
/Applications/Xcode-beta.app/Contents/Applications/DeviceHub.app
bundle id: com.apple.dt.Devices
Target simulator:
iPhone 17 Pro, iOS 26.5
Control result with XCODEBUILDMCP_HEADLESS_LAUNCH=1:
build-and-run SUCCEEDED on the iOS 26.5 simulator
app launched successfully
no DevicesTrampoline process was created
Editor/Client
Codex desktop with Codex CLI 0.144.1
MCP Server Version
2.7.0
LLM
GPT-5 Codex
MCP Configuration
[mcp_servers.xcodebuildmcp]
command = "npx"
args = ["-y", "[email protected]", "mcp"]
env = {
DEVELOPER_DIR = "/Applications/Xcode.app/Contents/Developer",
XCODEBUILDMCP_ENABLED_WORKFLOWS = "simulator,ui-automation,debugging,logging",
}
Steps to Reproduce
- Install Xcode 26 stable at
/Applications/Xcode.app. - Install Xcode 27 beta at
/Applications/Xcode-beta.app. - Set
DEVELOPER_DIR=/Applications/Xcode.app/Contents/Developer. - Leave
XCODEBUILDMCP_HEADLESS_LAUNCHunset. - Select an available iOS 26.5 simulator by UDID.
- Run
open_simorbuild_run_sim. - Observe that Device Hub from Xcode 27 beta opens instead of Simulator.app
from the selected stable Xcode.
Expected Behavior
In automatic GUI mode, the active Apple toolchain should own the simulator
frontend:
- Xcode 26 stable selected -> Simulator.app
- Xcode 27 selected -> Device Hub
An explicit auto | simulator | device-hub preference would also work, with
auto derived from the Xcode selected by DEVELOPER_DIR rather than from the
machine-wide devices:// URL handler.
Headless mode should continue to suppress both frontends.
Actual Behavior
For every non-headless launch, XcodeBuildMCP tries Device Hub first. Because the
Xcode 27 beta installation registers devices://, that succeeds even though
stable Xcode is selected, so Simulator.app is never attempted.
Error Messages
No command error is emitted; the wrong GUI frontend opens successfully.
Related
#498 covers the separate but complementary problem of selecting the newest
simulator runtime within a stable OS major when a next-major beta is installed.
- 主要语言
- TypeScript
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