A command that builds a SwiftUI view, a screen written with Apple's Swift user-interface framework, and captures its rendered preview for visual inspection. It can resolve the project, choose a build method, and save an image.

Use it to preview a SwiftUI file, choose a scheme or workspace, capture an image only, or inspect the rendered result.

It makes it easier to check how a SwiftUI screen actually looks after building. It also handles common project and preview setup details automatically.

How Iron-Ham/XcodePreviews configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to Iron-Ham/XcodePreviews. 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/Iron-Ham/XcodePreviews/main/.claude/commands/preview.md

Clone the repo

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

Made for: Claude Code.

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

Your own site

<a href="https://agentmods.dev/commands/iron-ham/xcodepreviews/preview"><img src="https://agentmods.dev/badge/commands/iron-ham/xcodepreviews/preview/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/commands/iron-ham/xcodepreviews/preview"><img src="https://agentmods.dev/badge/commands/iron-ham/xcodepreviews/preview.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 997 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	$0.00000	$0.00997
Opus 5.5	$0.00000	$0.00399
Sonnet 5.5	$0.00000	$0.00199
Haiku 4.5	$0.00000	$0.00100

Measured 1mo ago against content hash c6b7baee51b5, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

preview 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.

.claude/commands/preview.md · 147 lines

How it starts

The opening of the file, as written. The whole thing — 147 lines — stays where its author put it; the contents beside it link to each section on GitHub.

/preview - Build and Capture SwiftUI Preview

Build a SwiftUI view and capture its rendered output for visual analysis.

Arguments

$ARGUMENTS - File path, or options like --scheme, --workspace, --capture-only

Instructions

You are the preview capture assistant. Your job is to build SwiftUI previews and analyze their visual output.

Path Resolution: Scripts default to ~/XcodePreviews. If that directory doesn't exist, fall back to ~/Claude-XcodePreviews (legacy name). The PREVIEW_BUILD_PATH environment variable overrides both.

Unified Entry Point

For most cases, use the unified preview script which auto-detects the best approach:

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

This will automatically:

Detect if the file has a #Preview block
Find the associated Xcode project or SPM package
Use dynamic preview injection for fast builds (~3-4 seconds)
Fall back to full scheme builds when needed

Preview Modes

The unified preview script auto-detects the best mode. You can also be explicit:

Xcode Project with #Preview (Fastest)

Injects a minimal PreviewHost target, builds only required modules (~3-4 seconds):

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

SPM Package

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 (No Dependencies)

For Swift files that only use system frameworks (SwiftUI, UIKit, Foundation):

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

Select a Named Preview

When a file has multiple #Preview blocks, select one by name:

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

Read the full file on GitHub · 147 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 · 147 lines · 0 tokens per session scan A c6b7baee51b5

Subscribe to this mod's changes

preview is a command published in the GitHub repository Iron-Ham/XcodePreviews (152 stars, last pushed 3mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 997 tokens. 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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The canon is /.claude/docs/reference/design-lane.md — the tier model, the precedence order (owner > aesthetic > detector), the aesthetic-capture protocol, and the shared T1/T2 mechanics are defined THERE, once. This command routes a .swift design request to a tier and executes it with the iOS deltas below. It restates…

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