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 skills add rshankras/claude-code-apple-skills --skill watermark-enginegit clone --depth 1 https://github.com/rshankras/claude-code-apple-skillsWrote 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.
[](https://agentmods.dev/skills/rshankras/claude-code-apple-skills/watermark-engine)<a href="https://agentmods.dev/skills/rshankras/claude-code-apple-skills/watermark-engine"><img src="https://agentmods.dev/badge/skills/rshankras/claude-code-apple-skills/watermark-engine/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.
<a href="https://agentmods.dev/skills/rshankras/claude-code-apple-skills/watermark-engine"><img src="https://agentmods.dev/badge/skills/rshankras/claude-code-apple-skills/watermark-engine.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00054 | $0.02768 |
| Opus 5.5 | $0.00022 | $0.01107 |
| Sonnet 5.5 | $0.00011 | $0.00554 |
| Haiku 4.5 | $0.00005 | $0.00277 |
Grade A, and why
watermark-engine 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.
How it starts
The opening of the file, as written. The whole thing — 329 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Watermark Engine Generator
Generate a production watermarking system with text/image/logo overlays, configurable positioning and opacity, tiled patterns, live SwiftUI preview, and automatic watermark removal on subscription purchase.
When This Skill Activates
Use this skill when the user:
- Asks to "add watermark" or "watermark images"
- Wants a "branded overlay" or "logo overlay on photos"
- Mentions "remove watermark on purchase" or "free tier watermark"
- Asks about "content watermarking" or "image branding"
- Wants "tiled watermark" or "diagonal watermark pattern"
- Mentions "attribution overlay" or "copyright overlay"
Pre-Generation Checks
1. Project Context Detection
- Check Swift version (requires Swift 5.9+)
- Check deployment target (iOS 16+ / macOS 13+)
- Check for @Observable support (iOS 17+ / macOS 14+)
- Identify source file locations
2. Conflict Detection
Search for existing watermark or overlay code:
Glob: **/*Watermark*.swift, **/*Overlay*.swift, **/*Branding*.swift
Grep: "watermark" or "overlay" or "CGContext" or "draw(in:"
If existing watermark code found:
- Ask if user wants to replace or extend it
- If extending, integrate with existing architecture
3. Dependency Detection
Check for existing image processing infrastructure:
Grep: "CoreImage" or "CoreGraphics" or "CGImage" or "UIGraphicsImageRenderer"
Grep: "StoreKit" or "SubscriptionStatus" or "Product.SubscriptionInfo"
If paywall/subscription code exists, integrate watermark removal with existing subscription logic rather than generating standalone subscription checks.
4. Platform Detection
Determine if generating for iOS (UIImage) or macOS (NSImage) or both (cross-platform typealias).
Configuration Questions
Ask user via AskUserQuestion:
- Watermark content type?
- Text (e.g., username, app name, copyright)
- Image/Logo (e.g., brand logo PNG with transparency)
- Attributed text (styled text with font, color, shadow)
What ships with it
1 file 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.
- 1mo ago First seen · 329 lines · 54 tokens per session scan A ec6ea7a14711
watermark-engine is a skill published in the GitHub repository rshankras/claude-code-apple-skills (836 stars, last pushed 3mo ago), licensed MIT. It adds 54 tokens to every session and 2,768 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-09-03.
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