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 rules/iron-ham/xcodepreviews/previewgit clone --depth 1 https://github.com/Iron-Ham/XcodePreviewsWhat 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 | $0.00454 | $0.00454 |
| Opus 5 | $0.00227 | $0.00227 |
| Sonnet 5 | $0.00091 | $0.00091 |
| Haiku 4.5 | $0.00045 | $0.00045 |
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 2d 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.
What it actually says
PreviewBuild - SwiftUI Preview Capture Toolkit
A toolkit for building and capturing SwiftUI previews for visual analysis.
Quick Start
# Standalone Swift file (no external dependencies)
./scripts/preview MyView.swift
# File in an Xcode project (auto-injects PreviewHost target)
./scripts/preview ContentView.swift --project MyApp.xcodeproj
# File in an SPM package
./scripts/preview Sources/Module/MyView.swift
# Just capture current simulator
./scripts/preview --capture-only
How It Works
| Project Type | Approach | Build Time | Script |
|---|---|---|---|
| Standalone Swift | Minimal host app | ~5 seconds | preview-minimal.sh |
| Xcode project | Dynamic target injection | ~3-4 seconds | preview-tool |
| SPM package | Temporary project creation | ~20 seconds | preview-tool |
Scripts & Tools
| Path | Purpose |
|---|---|
scripts/preview |
Unified entry point - auto-detects best approach |
scripts/preview-minimal.sh |
Build standalone Swift files |
scripts/xcode-preview.sh |
Build full Xcode project schemes |
scripts/capture-simulator.sh |
Screenshot current simulator |
scripts/sim-manager.sh |
Simulator management |
tools/preview-tool |
Swift CLI for dynamic preview injection, SPM preview, dependency resolution |
Workflow for Cursor
When asked to preview a SwiftUI view:
-
Run the preview script:
./scripts/preview path/to/MyView.swift --output /tmp/preview.png -
View the screenshot: Read the file at
/tmp/preview.png -
Analyze and report: Describe layout, styling, colors, and any issues
Requirements
- macOS with Xcode installed
- iOS Simulator
- Swift toolchain (preview-tool auto-builds on first run)
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.
- 2d ago First seen · 63 lines · 454 tokens per session scan A 7f7fe9aaf32d
preview is a cursor rule published in the GitHub repository Iron-Ham/XcodePreviews (151 stars, last pushed 1mo ago), licensed MIT. It adds 454 tokens to every session, about $0.0023 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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