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.
npx agentmods add skills/fiveonecode/agent-skills/xcode-buildnpx skills add fiveonecode/agent-skills --skill xcode-buildgit clone --depth 1 https://github.com/fiveonecode/agent-skillsWhat 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 | $0.00065 | $0.01725 |
| Opus 5 | $0.00032 | $0.00863 |
| Sonnet 5 | $0.00013 | $0.00345 |
| Haiku 4.5 | $0.00006 | $0.00172 |
Grade A, and why
xcode-build 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 yesterday.
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.
How it starts
The opening of the file, as written. The whole thing — 242 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Xcode Build Direct
Build and manage iOS/macOS projects using native Xcode CLI tools. The core workflow uses Xcode/macOS command-line tools only; optional third-party helpers are called out separately when shown.
When to Use This Skill
Use this skill when:
- Building iOS or macOS apps with Xcode
- Running apps in iOS simulators
- Managing simulator instances (boot, shutdown, list)
- Taking screenshots of simulators
- Capturing app logs
- Running tests (unit or UI)
- Automating UI interactions (tap, type, swipe)
Preference: Use direct CLI commands (xcodebuild, xcrun simctl) when you
need portable, inspectable build evidence. If a project has a proven richer
tooling path, such as XcodeBuildMCP, simulator automation, or a repo-local
harness, follow that project-specific path.
Quick Start
1. Discover Project Structure
# List schemes in a workspace
xcodebuild -workspace /path/to/App.xcworkspace -list
# List schemes in a project
xcodebuild -project /path/to/App.xcodeproj -list
# Show build settings
xcodebuild -workspace /path/to/App.xcworkspace -scheme AppScheme -showBuildSettings
2. Find Available Simulators
# List all simulators
xcrun simctl list devices
# List as JSON (better for parsing)
xcrun simctl list devices --json
# List only available simulators
xcrun simctl list devices available
3. Build for Simulator
# List available simulators, then copy the UUID between parentheses.
xcrun simctl list devices available
UDID="PASTE-SIMULATOR-UUID-HERE"
# Build
xcodebuild \
-workspace /path/to/App.xcworkspace \
-scheme AppScheme \
-destination "platform=iOS Simulator,id=$UDID" \
-configuration Debug \
-derivedDataPath /tmp/build \
build
4. Install and Launch
# Find the built .app
APP_PATH=$(find /tmp/build -name "*.app" -type d | head -1)
# Install on simulator
xcrun simctl install $UDID "$APP_PATH"
# Launch app
xcrun simctl launch $UDID com.your.bundleid
5. Take Screenshot
xcrun simctl io $UDID screenshot /tmp/screenshot.png
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- yesterday First seen · 242 lines · 65 tokens per session scan A a7afbfcf8b2a
xcode-build is a skill published in the GitHub repository fiveonecode/agent-skills (19 stars, last pushed 10d ago), licensed MIT. It adds 65 tokens to every session and 1,725 once invoked, about $0.0003 per session on Opus 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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