Instructions for building and testing iOS apps in an iOS Simulator using XcodeBuildMCP. They cover checking the required tool, finding the project and scheme, and verifying app behavior.

Use them to list simulators, discover an Xcode project, build and install the app, run tests, and capture screenshots or logs.

They provide a repeatable way to confirm that an iOS app builds, installs, and behaves correctly before it is handed over.

test-xcode — Skill for Claude Code by gvkhosla/compound-engineering-pi

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add gvkhosla/compound-engineering-pi --skill test-xcode

Clone the repo

git clone --depth 1 https://github.com/gvkhosla/compound-engineering-pi

Made for: Claude Code.

Or install compound-engineering, the plugin that ships this one along with the rest of its 41 skills, 1 MCP server.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/gvkhosla/compound-engineering-pi/test-xcode/github.svg)](https://agentmods.dev/skills/gvkhosla/compound-engineering-pi/test-xcode)

Your own site

<a href="https://agentmods.dev/skills/gvkhosla/compound-engineering-pi/test-xcode"><img src="https://agentmods.dev/badge/skills/gvkhosla/compound-engineering-pi/test-xcode/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/gvkhosla/compound-engineering-pi/test-xcode"><img src="https://agentmods.dev/badge/skills/gvkhosla/compound-engineering-pi/test-xcode.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 18 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,434 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00018	$0.01434
Opus 5.5	$0.00007	$0.00574
Sonnet 5.5	$0.00004	$0.00287
Haiku 4.5	$0.00002	$0.00143

Measured 1mo ago against content hash 1f56bc3f803d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

test-xcode scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

test-xcode — 86% identical, 10 lines differ

plugins/compound-engineering/skills/test-xcode/SKILL.md · 211 lines

How it starts

The opening of the file, as written. The whole thing — 211 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Xcode Test Skill

Build, install, and test iOS apps on the simulator using XcodeBuildMCP. Captures screenshots, logs, and verifies app behavior.

Prerequisites

Xcode installed with command-line tools
XcodeBuildMCP MCP server connected
Valid Xcode project or workspace
At least one iOS Simulator available

Workflow

0. Verify XcodeBuildMCP is Available

Check that the XcodeBuildMCP MCP server is connected by calling its list_simulators tool.

MCP tool names vary by platform:

Claude Code: mcp__xcodebuildmcp__list_simulators
Other platforms: use the equivalent MCP tool call for the XcodeBuildMCP server's list_simulators method

If the tool is not found or errors, inform the user they need to add the XcodeBuildMCP MCP server:

XcodeBuildMCP not installed

Install via Homebrew:
  brew tap getsentry/xcodebuildmcp && brew install xcodebuildmcp

Or via npx (no global install needed):
  npx -y xcodebuildmcp@latest mcp

Then add "XcodeBuildMCP" as an MCP server in your agent configuration
and restart your agent.

Do NOT proceed until XcodeBuildMCP is confirmed working.

1. Discover Project and Scheme

Call XcodeBuildMCP's discover_projs tool to find available projects, then list_schemes with the project path to get available schemes.

If an argument was provided, use that scheme name. If "current", use the default/last-used scheme.

2. Boot Simulator

Call list_simulators to find available simulators. Boot the preferred simulator (iPhone 15 Pro recommended) using boot_simulator with the simulator's UUID.

Wait for the simulator to be ready before proceeding.

3. Build the App

Call build_ios_sim_app with the project path and scheme name.

On failure:

Capture build errors
Create a P1 todo for each build error
Report to user with specific error details

On success:

Note the built app path for installation
Proceed to step 4

4. Install and Launch

Call install_app_on_simulator with the built app path and simulator UUID
Call launch_app_on_simulator with the bundle ID and simulator UUID
Call capture_sim_logs with the simulator UUID and bundle ID to start log capture

Read the full file on GitHub · 211 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

1mo ago First seen · 211 lines · 18 tokens per session scan A 1f56bc3f803d

Subscribe to this mod's changes

test-xcode is a skill published in the GitHub repository gvkhosla/compound-engineering-pi (52 stars, last pushed 17d ago), licensed MIT. It adds 18 tokens to every session and 1,434 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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