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Agent skill

Watermark Engine

by gustavscirulis in gustavscirulis/snapgrid

Generates a watermark overlay system for images and video with configurable positioning, opacity, tiling, and paywall integration for automatic removal on subscription or purchase.

Custom licenceAuto-check: notesMarketing & SEO

Install Watermark Engine

skills CLI
$ npx skills add gustavscirulis/snapgrid --skill watermark-engine -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install gustavscirulis/snapgrid watermark-engine --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/gustavscirulis/snapgrid.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/skills/generators/watermark-engine .claude/skills/watermark-engine && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
watermark-engine
GitHub stars
117
Used in
1 other repo
Token cost
~2.7k tokens
SKILL.md length
647 words
Files
2
Skills in repo
118
Repo updated
First seen
Licence
Custom licence

At a glance

Generates a watermark overlay system for images and video with configurable positioning, opacity, tiling, and paywall integration for automatic removal on subscription or purchase.

  • Works in 10 steps: Project Context Detection → Conflict Detection → Dependency Detection → …
  • User wants to add branding
  • SKILL.md covers When This Skill Activates, Pre-Generation Checks, Configuration Questions and Generation Process, plus 3 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Watermark Engine is an agent skill from gustavscirulis/snapgrid. Generates a watermark overlay system for images and video with configurable positioning, opacity, tiling, and paywall integration for automatic removal on subscription or purchase. Use when user wants to add branding, attribution, or free-tier watermarks to visual content.

Its SKILL.md is about 2.7k tokens, which your agent loads only when the skill is triggered. The skill folder holds 1 other file (for example `templates.md`).

It sits in Marketing & SEO, covering Positioning and messaging. It works with iOS and macOS. The repository describes itself as: SnapGrid is an open-source Mac app for collecting, organizing, and analyzing UI screenshots. It uses AI to automatically detect UI components and patterns, making it a powerful…

When your agent uses it

  • User wants to add branding
  • Free-tier watermarks to visual content

Example prompts

  • “Use the watermark-engine skill to generate a watermark overlay system for images and video with configurable positioning, opacity, tiling, and…”
  • “/watermark-engine”

Requirements

  • Pre-approved tools (allowed-tools): Read, Write, Edit, Glob, Grep, Bash, AskUserQuestion

Workflow steps

10 steps, taken from the step headings in SKILL.md.

  1. Project Context Detection
  2. Conflict Detection
  3. Dependency Detection
  4. Platform Detection
  5. Read Templates
  6. Create Core Files
  7. Create UI Files
  8. Create Manager
  9. Create Modifier
  10. Determine File Location

What it can do on your machine

Read from SKILL.md and the folder at commit eb7eaf4. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves these tools, so the agent can use them without asking each time:

    • Read
    • Write
    • Edit
    • Glob
    • Grep
    • Bash
    • AskUserQuestion

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are swift).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Watermark Engine loads about 2.7k tokens when it runs. Until then it costs about 73 tokens; SKILL.md has 647 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~73
When it runs · the whole SKILL.md, loaded when a task matches
~2.7k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check: notes

The automated check noted patterns worth knowing about, such as sudo or a known installer.

  • NotePre-approves every shell command (allowed-tools: Bash)SKILL.md
    allowed-tools: Read, Write, Edit, Glob, Grep, Bash, AskUserQuestion

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 647 words (~2,698 tokens).

“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.”

— opening of SKILL.md by gustavscirulis, Custom licence
name
watermark-engine
allowed-tools
Read, Write, Edit, Glob, Grep, Bash, AskUserQuestion

Read the full SKILL.md on GitHub

Files

SKILL.md and 1 other file in .claude/skills/skills/generators/watermark-engine of gustavscirulis/snapgrid.

  • SKILL.md
  • templates.md

Open the folder on GitHubat commit eb7eaf4

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in gustavscirulis/snapgrid, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Watermark Engine next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Watermark Engine compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Watermark Engine this skillgustavscirulis/snapgrid1171 repos~2.7kAutomated safety check: NotesCustom licence
Rankupyan-labs/yan-skills209—~5.1kAutomated safety check: NotesMIT
Mobile Onboardingsanqiufong/slides-from-anything1321 repos~380Automated safety check: PassApache-2.0
Site ArchitectureAvdLee/RocketSimApp80411 repos~3.3kAutomated safety check: PassCustom licence
macOS Notch UIfayazara/Screendrop2.1k—~1.8kAutomated safety check: PassCC0-1.0
Engine Whats Newflutter/flutter179k—~978Automated safety check: PassBSD-3-Clause

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Works with

Categories

Questions about Watermark Engine

What does Watermark Engine do?

Generates a watermark overlay system for images and video with configurable positioning, opacity, tiling, and paywall integration for automatic removal on subscription or purchase. Watermark Engine is an agent skill from gustavscirulis/snapgrid. Generates a watermark overlay system for images and video with configurable positioning, opacity, tiling, and paywall integration for automatic removal on subscription or purchase.

When should I use Watermark Engine?

Watermark Engine fits situations like: user wants to add branding; free-tier watermarks to visual content.

How do I install Watermark Engine in Claude Code?

Run `npx skills add gustavscirulis/snapgrid --skill watermark-engine -a claude-code`. Or copy the skill folder (.claude/skills/skills/generators/watermark-engine in gustavscirulis/snapgrid) into .claude/skills/watermark-engine in your project. Claude Code loads it when a task matches its description.

How do I install Watermark Engine in Codex?

Run `npx skills add gustavscirulis/snapgrid --skill watermark-engine -a codex`. Or copy the skill folder (.claude/skills/skills/generators/watermark-engine in gustavscirulis/snapgrid) into .agents/skills/watermark-engine in your project. Codex loads it when a task matches its description.

Can I use Watermark Engine in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add gustavscirulis/snapgrid --skill watermark-engine -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/watermark-engine, .gemini/skills/watermark-engine, .github/skills/watermark-engine and .opencode/skills/watermark-engine in your project.

What does Watermark Engine need to run?

SKILL.md names no scripts, command-line tools or credentials: Watermark Engine is instructions for the agent only. Its frontmatter pre-approves these tools: Read, Write, Edit, Glob, Grep, Bash, AskUserQuestion.

Does Watermark Engine access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Watermark Engine safe to install?

Our automated static check of SKILL.md found notes only (pre-approves every shell command (allowed-tools: bash)), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.

What licence does Watermark Engine use?

Watermark Engine has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Watermark Engine use?

About 2.7k tokens (SKILL.md is roughly 11k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Watermark Engine?

Skills that share tags, products or a category with Watermark Engine: Rankup (yan-labs/yan-skills, 209 stars), Mobile Onboarding (sanqiufong/slides-from-anything, 132 stars), Site Architecture (AvdLee/RocketSimApp, 804 stars) and macOS Notch UI (fayazara/Screendrop, 2.1k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Watermark Engine?

gustavscirulis (a GitHub user) maintains it in gustavscirulis/snapgrid, which has 117 GitHub stars. The repository holds 118 skills in this directory. The repository was last updated on April 30, 2026.

Source: gustavscirulis/snapgrid on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.