What is xtool CLAUDE.md?

A Claude Code plugin that explains how to develop Swift Package Manager iOS apps with xtool, including projects built without Xcode. It also covers app extensions such as widgets, sharing, and keyboards.

Use it to configure, build, and develop SwiftPM-based iOS apps and extensions with xtool on macOS, Linux, or Windows.

It prevents common setup mistakes by distinguishing xtool from XcodeGen and documenting the expected files, commands, targets, and extension layout.

How 2389-research/xtool configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to 2389-research/xtool. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/2389-research/xtool/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/2389-research/xtool

Made for: Claude Code.

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/instructions/2389-research/xtool/claude-md/github.svg)](https://agentmods.dev/instructions/2389-research/xtool/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/2389-research/xtool/claude-md"><img src="https://agentmods.dev/badge/instructions/2389-research/xtool/claude-md/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/instructions/2389-research/xtool/claude-md"><img src="https://agentmods.dev/badge/instructions/2389-research/xtool/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 525 This file is loaded in full into every session.

When invoked 525 The same file — it is already loaded in full.

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	$0.00525	$0.00525
Opus 5.5	$0.00210	$0.00210
Sonnet 5.5	$0.00105	$0.00105
Haiku 4.5	$0.00052	$0.00052

Measured 2mo ago against content hash 9bfae99dcde7, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

xtool CLAUDE.md 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 2mo 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.

CLAUDE.md · 73 lines

How it starts

The opening of the file, as written. The whole thing — 73 lines — stays where its author put it; the contents beside it link to each section on GitHub.

xtool Plugin

Overview

This plugin provides guidance for Xcode-free iOS development using xtool. It helps build SwiftPM-based iOS apps on Linux, Windows, and macOS without requiring Xcode.

Skills Included

using-xtool (Main Skill)

Auto-detects when working with:

xtool projects or configuration
SwiftPM iOS apps
iOS development on non-macOS platforms
App extensions (widgets, share, keyboard, etc.)

Key Patterns

xtool is NOT XcodeGen

This is the most critical distinction. xtool:

Uses xtool.yml (not project.yml or Project.swift)
Uses standard SwiftPM Package.swift
Uses xtool dev command (not xtool build or xtool run)
Places extensions in Sources/ (standard SwiftPM, not Extensions/)

Project Structure

MyApp/
├── Package.swift          # SwiftPM package definition
├── xtool.yml              # xtool configuration
├── Sources/
│   ├── MyApp/             # Main app target
│   └── MyWidget/          # Extension targets
└── *-Info.plist           # Optional custom plists

App Extensions Pattern

Extensions require:

.library product + target in Package.swift (not .executable)
Entry in xtool.yml under extensions:
Info.plist with NSExtensionPointIdentifier

Common Commands

xtool new MyApp          # Create project
xtool dev                # Build + run
xtool dev build --ipa    # Build IPA
xtool dev run -s         # Run on simulator
xtool devices            # List devices
xtool auth login         # Authenticate

Troubleshooting Reference

Issue	Solution
"Untrusted Developer"	Settings > VPN & Device Management > Trust
Device not found	`xtool devices`, enable Developer Mode
Auth failed	`xtool auth login`
First build slow	Normal - SDK modules building

Development Notes

When assisting with xtool projects:

Always verify xtool.yml exists (not project.yml)
Check Package.swift uses .library products
Extensions go in Sources/, not Extensions/
Use xtool dev not xtool build

Read the full file on GitHub · 73 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.

2mo ago First seen · 73 lines · 525 tokens per session scan A 9bfae99dcde7

Subscribe to this mod's changes

xtool CLAUDE.md is an instructions file published in the GitHub repository 2389-research/xtool (5 stars, last pushed 5d ago), licensed MIT. It adds 525 tokens to every session, about $0.0021 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 2026-08-31.

Kotlin and Swift Languages Mobile cross-platform extensions ios swift swiftpm widgets

xtool CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
xtool CLAUDE.md2389-research/xtool	Instructions file	5	5d ago	MIT	A	525	Claude Code
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

xtool: Instructions file for Claude Code