Xcode MCP Tool Reference

Complete reference for every tool exposed by Xcode's MCP server — the Model Context Protocol interface that lets an AI assistant drive Xcode directly. Covers parameters, return shapes, and the behavioral caveats that the tool descriptions leave out. Generated from a live tools/list capture on Xcode 27 beta 5, not from documentation.

When to Use This Reference

Use this reference when:

• Looking up the exact parameter list for a specific MCP tool
• Checking the return-shape contract for BuildProject, RunAllTests, RenderPreview, or any other tool
• Verifying which parameters are required versus optional
• Working out why a call failed with workspaceIdentifier is required for this action
• Choosing between near-equivalent tools (XcodeUpdate vs XcodeWrite, RunAllTests vs RunSomeTests, GetBuildLog vs XcodeRefreshCodeIssuesInFile)
• Bootstrapping a headless session — opening, creating, or listing workspaces
• Wondering why a tool you expected is missing from tools/list

Example Prompts

• "What parameters does BuildProject take?"
• "What does GetBuildLog return?"
• "How do I open a project when Xcode isn't running?"
• "What's the difference between RunSomeTests and RunAllTests?"
• "Why does my tool call say workspaceIdentifier is required when only one project is open?"
• "Why can't I find DocumentationSearch in the tool list?"
• "What does XcodeNewProject need — projectName or productName?"

Two Things That Trip Everyone Up

The tool count changes. The server exposes 53 tools with no workspace open and 54 with one — it advertises capabilities.tools.listChanged: true, and DocumentationSearch is the sole workspace-gated tool. A tool missing from tools/list may simply mean nothing is open yet.

workspaceIdentifier is required even though it never appears in a required list. All 46 tools that accept it demand it, even when a single workspace is open. The error names the valid identifiers, so a missed one costs a round trip rather than a wrong-target write. Identifiers are readable slugs (workspace-Gxw7GRzGoI), not UUIDs, and come from XcodeListWorkspaces. On Xcode 26.x this parameter was tabIdentifier, which no longer exists in any tool.

What's Covered

Workspaces & projects

XcodeListWorkspaces, XcodeOpenWorkspace, XcodeCloseWorkspace, XcodeNewProject, XcodeListTemplates, XcodeNewTarget, XcodeListTargets

File operations

XcodeRead, XcodeWrite, XcodeUpdate, XcodeGlob, XcodeGrep, XcodeLS, XcodeMakeDir, XcodeMV, XcodeRM

Build

BuildProject, GetBuildLog, XcodeRefreshCodeIssuesInFile, GetTargetBuildSettings, UpdateTargetBuildSetting, GetFileCompilerFlags, UpdateFileCompilerFlags

Run & debug

RunProject, StopProject, GetConsoleOutput, InvokeDebuggerCommand, RunCodeSnippet

Testing

GetTestList, RunAllTests, RunSomeTests, XcodeListTestPlans, XcodeSwitchTestPlan

Schemes & run destinations

XcodeListSchemes, XcodeSwitchScheme, XcodeListRunDestinations, XcodeSwitchRunDestination

Previews

RenderPreview

Device interaction

DeviceInteractionStartSession, DeviceInteractionStartWorkspaceSession, DeviceInteractionInstallAndRun, DeviceInteractionSynthesize, DeviceInteractionEndSession

Crash & field diagnostics

GetTopCrashIssues, GetCrashIssueLogs, GetTopFieldPerformanceIssues, GetFieldPerformanceIssueLogs

Localization & string catalogs

LocalizationPlanner, StringCatalogContext, StringCatalogRead, StringCatalogEdit

Project configuration

AddEntitlement, AddInfoPlist

Documentation

DocumentationSearch

Fifteen entries carry extra notes for caveats their schema descriptions bury — among them the word "test" being forbidden in RunCodeSnippet's purpose, XcodeRM moving files to the Trash by default, XcodeListTemplates truncating to 100 of 193 templates, and GetTestList capping inline output at 100 tests.

Documentation Scope

This page documents the xcode-mcp-ref reference skill. For setup and connection guidance, including the headless server, see Xcode MCP Setup. For workflow patterns (workspace bootstrap, BuildFix loop, TestFix loop), see Xcode MCP Tools.

• For environment diagnostics outside MCP (Derived Data, zombie xcodebuild processes), see Xcode Debugging
• For Apple's bundled for-LLM documentation guides, see Apple Documentation Access — a separate resource from the DocumentationSearch tool
• For driving simulators and devices without MCP, see Device Control