Skills

49 open-source advertising skills, and a validator for yours

Skills are plain SKILL.md files that teach an agent how to do one job well. Synter publishes its advertising skills under MIT, and the scanner below checks any skill against the Agent Skills specification before you ship it.

Get the skills on GitHub Quickstart

Validator

Scan a skill

Paste a SKILL.md, upload one, or point at a GitHub repository. Every check links to the line of the specification it enforces.

SKILL.md contentsParent folder name (optional)The spec requires the folder name to match the skill name.

Checked against the Agent Skills specification. Nothing is stored.

Library

Every skill in the repo

Each name links to its SKILL.md. Copy the folder into your agent's skills directory and it is ready to use.

ad-copy-generation ad-creative-fatigue-detector ad-policy-compliance amazon-ads-optimizer anomaly-detector attribution-modeling audience-expansion-strategy bid-optimization budget-optimizer campaign-preflight campaign-structure-auditor chatgpt-ads-conversion-tracking chatgpt-ads-launch competitor-analysis creative-testing cross-platform-attribution cross-platform-launcher dayparting-scheduler executive-reporting first-party-data-strategy google-ads-quality-score google-shopping-optimizer gtm-metrics incrementality-testing keyword-research kill-scale-rules klaviyo-campaigns landing-page-optimizer linkedin-ads-targeting media-plan-builder meta-ads-diagnostics mmm-budget-planner multi-channel-reporting multi-platform-launch negative-keyword-miner performance-max-optimizer pixel-capi-auditor platform-cost-benchmarks public-ad-library-intelligence retargeting-sequence-designer roas-calculator seasonal-budget-planner spear spec-driven-dev tracking-leak-detector ugc-creative-brief ui-contrast-review utm-builder video-ad-scriptwriter

install

# clone and copy every skill into your agent's skills folder

$git clone https://github.com/Synter-Media-AI/free-skills.git

$mkdir -p .agents/skills

$cp -r free-skills/skills/* .agents/skills/

# or validate the whole repo first

$curl -s https://synter.dev/api/skills/scan -H 'content-type: application/json' -d '{"source":"github","url":"https://github.com/Synter-Media-AI/free-skills"}'

Specification

What the scanner checks

The rules come from the Agent Skills specification plus the extensions Amp, Claude Code, and Codex accept.

Frontmatter

name and description are required

YAML frontmatter opens the file. name is 1 to 64 characters of lowercase letters, digits, and hyphens, and must match the parent folder. description is 1 to 1024 characters and tells the agent when to use the skill.

Body

Under 500 lines, references one level deep

Keep SKILL.md focused. Move long material into scripts/, references/, or assets/ and link to it with relative paths. Deeply nested references and absolute paths fail the check.

Security

No secrets, no hidden instructions

The scanner flags API keys and tokens, prompt-injection patterns, destructive shell commands, and obfuscated payloads. A skill that fails a security check is capped at a failing score regardless of everything else.