synthid-api-skill

An agent skill for detecting AI-generated media using the Google SynthID watermark API.

What It Does

Gives AI coding agents the knowledge to call the SynthID VerifyContent endpoint to detect whether images, audio, or video were generated by Google AI. The skill covers:

• Supported media types and file size limits
• Content-Type header mapping for all formats
• curl examples for image, audio, and video verification
• Complete response schema with all enum definitions

Install

One-liner (recommended)

npx skills add pauldatta/synthid-api-skill

This works across Gemini CLI, Claude Code, Antigravity 2.0, Cursor, and any agent that supports the SKILL.md format.

Options

# Install globally (user-level, all projects)
npx skills add pauldatta/synthid-api-skill -g

# Install to current project only
npx skills add pauldatta/synthid-api-skill

# Non-interactive (CI/CD)
npx skills add pauldatta/synthid-api-skill -y

Manual Install

If you prefer not to use npx, copy the SKILL.md into the correct directory for your platform:

Gemini CLI

mkdir -p ~/.gemini/config/skills/synthid-api
curl -fsSL https://raw.githubusercontent.com/pauldatta/synthid-api-skill/main/SKILL.md \
  -o ~/.gemini/config/skills/synthid-api/SKILL.md

Claude Code

# Global
mkdir -p ~/.claude/skills/synthid-api
curl -fsSL https://raw.githubusercontent.com/pauldatta/synthid-api-skill/main/SKILL.md \
  -o ~/.claude/skills/synthid-api/SKILL.md

# Or project-local (committed to git)
mkdir -p .claude/skills/synthid-api
curl -fsSL https://raw.githubusercontent.com/pauldatta/synthid-api-skill/main/SKILL.md \
  -o .claude/skills/synthid-api/SKILL.md

Antigravity 2.0

mkdir -p ~/.gemini/antigravity/skills/synthid-api
curl -fsSL https://raw.githubusercontent.com/pauldatta/synthid-api-skill/main/SKILL.md \
  -o ~/.gemini/antigravity/skills/synthid-api/SKILL.md

Quick Reference

Method	Command
npx (recommended)	npx skills add pauldatta/synthid-api-skill
Gemini CLI native	gemini skills install pauldatta/synthid-api-skill
Manual	Copy SKILL.md to your platform's skill directory

Prerequisites

• A Google Cloud project with the SynthID API enabled
• A valid API key

License

Apache 2.0 — see LICENSE.