What is preview-build?

A build-and-capture tool for SwiftUI, Apple’s framework for creating app interfaces. It renders SwiftUI views in Xcode projects, Swift Package Manager packages, or standalone Swift files and saves screenshots.

Use it to build SwiftUI previews, capture the current iOS simulator screen, and visually check interface components.

It gives you a visual result to inspect when code alone does not show whether an iOS interface looks right.

preview-build — Skill for Claude Code and Cursor by Iron-Ham: A build-and-capture tool for SwiftUI, Apple’s framework for creating…

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.

agentmods

npx agentmods add skills/iron-ham/xcodepreviews/preview

Any agent

npx skills add Iron-Ham/XcodePreviews --skill preview

Clone the repo

git clone --depth 1 https://github.com/Iron-Ham/XcodePreviews

Made for: Claude Code, Cursor.

Or install XcodePreviews, the plugin that ships this one along with the rest of its 2 skills, 1 command.

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/iron-ham/xcodepreviews/preview.svg)](https://agentmods.dev/skills/iron-ham/xcodepreviews/preview)

Your own site

<a href="https://agentmods.dev/skills/iron-ham/xcodepreviews/preview"><img src="https://agentmods.dev/badge/skills/iron-ham/xcodepreviews/preview.svg" alt="Measured on agentmods" height="20"></a>

Per session 52 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 772 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

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	$0.00052	$0.00772
Opus 5	$0.00026	$0.00386
Sonnet 5	$0.00010	$0.00154
Haiku 4.5	$0.00005	$0.00077

Measured 6d ago against content hash 849f3ee61ca0, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

preview-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 6d 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.

.cursor/skills/preview/SKILL.md · 101 lines

How it starts

The opening of the file, as written. The whole thing — 101 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Xcode Preview Capture Skill

Build SwiftUI views and capture screenshots of their rendered output for visual analysis.

Installation Path

Scripts are located at ${PREVIEW_BUILD_PATH:-$HOME/XcodePreviews}/scripts/

Compatibility: If ~/XcodePreviews doesn't exist, fall back to ~/Claude-XcodePreviews (legacy name). The PREVIEW_BUILD_PATH environment variable overrides both.

Available Commands

Unified Preview (Recommended)

Auto-detects project type and uses the best approach:

"${PREVIEW_BUILD_PATH:-$HOME/XcodePreviews}"/scripts/preview \
  <path-to-file.swift> \
  --output /tmp/preview.png

Quick Capture (Current Simulator)

"${PREVIEW_BUILD_PATH:-$HOME/XcodePreviews}"/scripts/capture-simulator.sh \
  --output /tmp/preview-capture.png

Xcode Project with #Preview

Fast builds by injecting a minimal PreviewHost target (handled automatically by the unified script):

"${PREVIEW_BUILD_PATH:-$HOME/XcodePreviews}"/scripts/preview \
  <path-to-file.swift> \
  --project <path.xcodeproj> \
  --output /tmp/preview.png

SPM Package Preview

Auto-detected from Package.swift in parent directories:

"${PREVIEW_BUILD_PATH:-$HOME/XcodePreviews}"/scripts/preview \
  <path-to-file.swift> \
  --output /tmp/preview.png

Standalone Swift File

Build a standalone Swift file with system frameworks only:

"${PREVIEW_BUILD_PATH:-$HOME/XcodePreviews}"/scripts/preview \
  <path-to-file.swift> \
  --output /tmp/preview.png

Workflow

When the user asks to preview a SwiftUI view:

Identify the target: Determine what needs to be previewed (Swift file, project scheme, or current simulator state)
Build and capture: Run the appropriate script
Read and analyze: Use the Read tool to view the captured PNG at /tmp/preview.png
Report findings:
- Layout: Structure and arrangement
- Visual elements: Buttons, text, images
- Styling: Colors, fonts, spacing
- Issues: Alignment, overflow, accessibility
- Suggestions: Improvements

Read the full file on GitHub · 101 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.

6d ago First seen · 101 lines · 52 tokens per session scan A 849f3ee61ca0

Subscribe to this mod's changes

preview-build is a skill published in the GitHub repository Iron-Ham/XcodePreviews (151 stars, last pushed 2mo ago), licensed MIT. It adds 52 tokens to every session and 772 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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