# Xcode MCP Snippet

> Execute a Swift snippet in the context of a specific Xcode source file through Xcode MCP. Use when the user asks to quickly evaluate Swift logic, inspect fileprivate behavior, print local type results, or run a small code experiment inside an app/framework/library target.

- Skill: `ai-x-builder/xcode-mcp-snippet` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add ai-x-builder/xcode-mcp-snippet`
- Raw SKILL.md: https://api.skillmd.com/api/skills/ai-x-builder/xcode-mcp-snippet/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: AI & ML
- Author: ai-x-builder (https://skillmd.com/u/ai-x-builder)
- Updated: 2026-09-22
- Page: https://skillmd.com/skills/ai-x-builder/xcode-mcp-snippet

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# Xcode MCP Snippet

## Overview

Run small Swift snippets through Xcode MCP with access to the selected source file's module context, including `fileprivate` declarations.

## Tool Availability

Before calling MCP tools, confirm the `mcp__xcode` namespace is available. If it is not available, use `tool_search` to expose Xcode MCP tools; if the tools still are not available, tell the user Xcode MCP is not connected and stop rather than editing files to simulate snippet execution.

## Workflow

1. Confirm the snippet is small, deterministic, and safe to run in the target context.
2. Discover Xcode tabs with `mcp__xcode.XcodeListWindows`.
3. Select the `tabIdentifier` for the workspace/project containing the source file.
4. Choose a Swift `sourceFilePath` in a target that builds an app, framework, library, or command-line executable.
5. Call `mcp__xcode.ExecuteSnippet` with a concise `purpose`, the `sourceFilePath`, the `codeSnippet`, and a timeout appropriate for the work.
6. Summarize printed output and any compile/runtime errors.

## Snippet Guidelines

- Include explicit `print` statements for values the user needs to see.
- Keep the `purpose` human-readable and avoid the word "test"; this tool is snippet execution, not XCTest.
- Do not run snippets with filesystem writes, network requests, account, signing, destructive, or production-affecting side effects. If the user requests one of these, explain that `ExecuteSnippet` is for deterministic in-target Swift evaluation and choose a safer workflow instead.
- Prefer pure logic checks, type construction, formatting output, and local helper behavior.

## Reporting

- Show the important printed output.
- State the file context and Xcode tab used.
- If the snippet cannot run because the file is not in a supported target, explain that precisely and choose a better source file if one is obvious.

## Constraints

- Do not use snippets as a substitute for real unit tests when the user asks for test coverage.
- Do not leave temporary `print` statements or helper code in the repository; snippets run through MCP and should not require source edits.