---
name: asset-catalog-optimizer
description: Analyze and optimize Xcode asset catalogs - find unused assets, missing resolutions, compress images
type: skill
language: python
---

# Asset Catalog Optimizer

Analyze `.xcassets` folders to optimize image assets and find issues.

## Capabilities

- List all assets in catalogs
- Find unused images (not referenced in code)
- Check for missing @2x/@3x versions
- Analyze image file sizes
- Compress images losslessly
- Detect duplicate images
- Validate asset naming
- Generate asset inventory
- Calculate total asset size
- Suggest optimizations

## Tools Included

###  `asset_optimizer.py`
Python script for asset analysis and optimization

**Commands:**
```bash
# Analyze asset catalog
./asset_optimizer.py PaleoRose/Assets.xcassets analyze

# Find unused assets
./asset_optimizer.py PaleoRose/Assets.xcassets find-unused --source-dir PaleoRose

# Check missing resolutions
./asset_optimizer.py PaleoRose/Assets.xcassets check-resolutions

# Compress images
./asset_optimizer.py PaleoRose/Assets.xcassets compress --quality 85

# Generate report
./asset_optimizer.py PaleoRose/Assets.xcassets report --output report.html

# Calculate sizes
./asset_optimizer.py PaleoRose/Assets.xcassets sizes
```

## Features

### Unused Asset Detection
Searches Swift/ObjC code for asset references like:
- `NSImage(named: "icon")`
- `UIImage(named: "logo")`
- `Image("background")`
- `[NSImage imageNamed:@"button"]`

### Resolution Checking
Verifies all imagesets have:
- @1x (universal or Mac)
- @2x (required for Retina)
- @3x (iOS only, warns if missing)

### Compression
- PNG: lossless optimization with pngquant/optipng
- JPEG: quality-based compression
- Preserves transparency
- Maintains color profiles

## Usage

Run when:
- App bundle is too large
- Need to audit assets
- Before App Store submission
- Cleaning up old/unused assets
- Optimizing performance

## Output Examples

```
Asset Catalog Analysis: Assets.xcassets
========================================

Total Assets: 47
Total Size: 12.3 MB

Missing Resolutions (5):
  - icon.imageset: Missing @2x
  - logo.imageset: Missing @3x
  - background.imageset: Missing @2x, @3x

Unused Assets (8):
  - old-button.imageset (45 KB)
  - deprecated-icon.imageset (23 KB)
  - test-image.imageset (156 KB)

Potential Savings:
  - Compression: 3.2 MB (26%)
  - Remove unused: 1.8 MB (15%)
  - Total: 5.0 MB (41%)

Recommendations:
  1. Compress 23 PNG files to save 3.2 MB
  2. Remove 8 unused assets to save 1.8 MB
  3. Add missing @2x/@3x versions for 5 assets
```


---
Source attribution: paleoterra
Original project: https://github.com/paleoterra/PaleoRose/blob/7da856003003ae316efddbf213e05da83bd66137/.agents/skills/asset-catalog-optimizer/SKILL.md
License: MIT
License information: https://opensource.org/license/mit
Original upstream instructions; downloaded from Dave AI.

## Upstream license notice

MIT License

Copyright (c) 2023 Thomas L. Moore

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.



# Dave AI resource metadata

Creator / publisher: paleoterra
Original project: https://github.com/paleoterra/PaleoRose/blob/7da856003003ae316efddbf213e05da83bd66137/.agents/skills/asset-catalog-optimizer/SKILL.md
Attribution basis: Recovered original package and original project license at a pinned revision

Fields of work: Development & Engineering, Product Management
Roles: Frontend Developer, Mobile Developer, Product Manager
Specialties: Backend
Tools: Xcode
Country applicability: Country not specified
Classification basis: Source catalog labels
Instruction SHA-256: 70fb208e98489f4452a7bb856815a34fe334dc55e58418bfaf7a13a37d1068f8
Metadata reviewed: 2026-10-27
This metadata supersedes earlier Dave AI catalog attribution. Original instruction and supporting files are preserved.