sl-test

A Model Context Protocol (MCP) server that provides Xcode-related tools for integration with AI assistants and other MCP clients.

Table of contents

• Overview
• Why?
• Features
  • Xcode project management
  • Swift Package Manager
  • Simulator management
  • App utilities
• Getting started
  • Prerequisites
  • UI Automation
  • Configure your MCP client
    • Quick install
    • Manual installation
    • Alternative installation method using mise
• Incremental build support
• Troubleshooting
  • Diagnostic Tool
    • Using with npx
    • Using with mise
  • MCP Server Logs
• Privacy
  • What is sent to Sentry?
  • Opting Out of Sentry
• Selective tool registration
• Demos
  • Autonomously fixing build errors in Cursor
  • Utilising the new UI automation and screen capture features
  • Building and running iOS app in Claude Desktop
• Contributing
• Licence

Overview

This project implements an MCP server that exposes Xcode operations as tools that can be invoked by AI agents via the MCP protocol. It enables programmatic interaction with Xcode projects through a standardised interface, optimised for agent-driven development workflows.

Why?

The XcodeBuild MCP tool exists primarily to streamline and standardise interaction between AI agents and Xcode projects. By providing dedicated tools for common Xcode operations, it removes reliance on manual or potentially incorrect command-line invocations.

This ensures a reliable and efficient development process, allowing agents to seamlessly leverage Xcode's capabilities while reducing the risk of configuration errors.

Critically, this MCP enables AI agents to independently validate code changes by building projects, inspecting errors, and iterating autonomously. In contrast to user-driven tools like Sweetpad, XcodeBuild MCP empowers agents to automate these workflows effectively.

Features

The XcodeBuildMCP server provides the following tool capabilities:

Xcode project management

• Discover Projects: Xcode projects and workspaces discovery
• Build Operations: Platform-specific build tools for macOS, iOS simulator, and iOS device targets
• Project Information: Tools to list schemes and show build settings for Xcode projects and workspaces
• Clean Operations: Clean build products using xcodebuild's native clean action
• Incremental build support: Lightning fast builds using incremental build support (experimental, opt-in required)
• Project Scaffolding: Create new iOS and macOS projects from modern templates with workspace + SPM package architecture, customizable bundle identifiers, deployment targets, and device families

Swift Package Manager

• Build Packages: Build Swift packages with configuration and architecture options
• Run Tests: Execute Swift package test suites with filtering and parallel execution
• Run Executables: Execute package binaries with timeout handling and background execution support
• Process Management: List and stop long-running executables started with Swift Package tools
• Clean Artifacts: Remove build artifacts and derived data for fresh builds

Simulator management

• Simulator Control: List, boot, and open iOS simulators
• App Deployment: Install and launch apps on iOS simulators
• Log Capture: Capture run-time logs from a simulator
• UI Automation: Interact with simulator UI elements (beta)
• Screenshot: Capture screenshots from a simulator (beta)

App utilities

• Bundle ID Extraction: Extract bundle identifiers from iOS and macOS app bundles
• App Launching: Launch built applications on both simulators and macOS

Getting started

Prerequisites

• macOS 14.5 or later
• Xcode 16.x or later
• Node 18.x or later
• AXe 1.0.0 or later (optional, required for UI automation)

UI Automation

For UI automation features (tap, swipe, type etc.), you'll need to install AXe:

For more information about AXe and other installation methods, see the AXe repository.

Configure your MCP client

Quick install

For a quick install, you can use the following links:

Manual installation

Configure your MCP client (Windsurf, Cursor, Claude Desktop, Claude Code etc.) to use the XcodeBuildMCP server by ammending your client application's MCP configuration.

Alternative installation method using mise

Alternatively, you can use XcodeBuildMCP without a specific installation of Node.js by using mise to install it:

Then configure your MCP client to use mise to install XcodeBuildMCP:

Incremental build support

XcodeBuildMCP includes experimental support for incremental builds. This feature is disabled by default and can be enabled by setting the INCREMENTAL_BUILDS_ENABLED environment variable to true:

To enable incremental builds, set the INCREMENTAL_BUILDS_ENABLED environment variable to true:

Example MCP client configuration:

Troubleshooting

If you encounter issues with XcodeBuildMCP, the diagnostic tool can help identify the problem by providing detailed information about your environment and dependencies.

Diagnostic Tool

The diagnostic tool is a standalone utility that checks your system configuration and reports on the status of all dependencies required by XcodeBuildMCP. It's particularly useful when reporting issues.

Using with npx

Using with mise

The diagnostic tool will output comprehensive information about:

• System and Node.js environment
• Xcode installation and configuration
• Required dependencies (xcodebuild, AXe, etc.)
• Environment variables affecting XcodeBuildMCP
• Feature availability status

When reporting issues on GitHub, please include the full output from the diagnostic tool to help with troubleshooting.

MCP Server Logs

It can be helpful to have access to the log messages from the MCP server to identify any issues. The logs are captured by the client application, for example in Cursor:

Cursor:

If your MCP client doesn't have log files you can run the server directly using the MCP Inspector tool see Debugging for more information on how to do this. Once running the MCP tool prints all log messages to it's error pane, which can be helpful in diagnosing issues.

Privacy

This project uses Sentry for error monitoring and diagnostics. Sentry helps us track issues, crashes, and unexpected errors to improve the reliability and stability of XcodeBuildMCP.

What is sent to Sentry?

• Only error-level logs and diagnostic information are sent to Sentry by default.
• Error logs may include details such as error messages, stack traces, and (in some cases) file paths or project names. You can review the sources in this repository to see exactly what is logged.

Opting Out of Sentry

• If you do not wish to send error logs to Sentry, you can opt out by setting the environment variable SENTRY_DISABLED=true.

Example MCP client configuration:

Selective tool registration

By default all tools are enabled but for some clients it may be useful to only enable specific tools to reduce the amount of context that is sent to the client. This can be achieved by setting specific environment variables in your clients MCP configuration.

Once you have enabled one or more tools or groups of tools all other tools will be disabled. For example, to enable only the simulator related tools, you can set the environment variable to XCODEBUILDMCP_GROUP_IOS_SIMULATOR_WORKFLOW=true this will only expose tools for building, running and debugging on simulators

You can find a list of available tools and detailed instructions on how to enable them in the TOOL_OPTIONS.md file.

Demos

Autonomously fixing build errors in Cursor

Utilising the new UI automation and screen capture features

Building and running iOS app in Claude Desktop

https://github.com/user-attachments/assets/e3c08d75-8be6-4857-b4d0-9350b26ef086

Contributing

Contributions are welcome! Here's how you can help improve XcodeBuildMCP.

See our CONTRIBUTING document for more information on how to configure your local environment and contribute to the project.

Licence

This project is licensed under the MIT License - see the LICENSE file for details.

MCP Server Verification

Glama.ai

MseeP.a