addyosmani/agent-skills is a collection of reusable workflows, quality checks, commands, and other instructions that guide AI coding agents through software development. It is for developers who want agents to follow consistent engineering practices, and the catalogue entries are its packaged skills, commands, agents, plugins, instructions, and hooks.
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.
/plugin marketplace add addyosmani/agent-skillsnpx agentmods add plugins/addyosmani/agent-skills/marketplacegit clone --depth 1 https://github.com/addyosmani/agent-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/plugins/addyosmani/agent-skills/marketplace)<a href="https://agentmods.dev/plugins/addyosmani/agent-skills/marketplace"><img src="https://agentmods.dev/badge/plugins/addyosmani/agent-skills/marketplace.svg" alt="Measured on agentmods" height="20"></a>Grade A, and why
addy-agent-skills marketplace 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 6d 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.
Copies of this mod
2 near-identical copies found in the catalogue:
- addy-agent-skills marketplace — 97% identical, 1 lines differ
- addy-agent-skills marketplace — 97% identical, 1 lines differ
What it actually says
{
"$schema": "https://json.schemastore.org/claude-code-marketplace.json",
"name": "addy-agent-skills",
"description": "Production-grade engineering skills for AI coding agents — covering the full software development lifecycle from spec to ship.",
"owner": {
"name": "Addy Osmani",
"url": "https://github.com/addyosmani"
},
"plugins": [
{
"name": "agent-skills",
"version": "0.6.8",
"source": {
"source": "github",
"repo": "addyosmani/agent-skills"
},
"description": "Production-grade engineering skills covering every phase of software development: spec, plan, build, verify, review, and ship.",
"homepage": "https://github.com/addyosmani/agent-skills",
"license": "MIT",
"keywords": ["skills", "agents", "engineering", "spec", "tdd", "review", "ship"]
}
]
}
The plugins it lists here
This marketplace lists 1 plugin kept in the same repository. Each has its own page, its own measurements and its own install command.
What ships with it
1 file beside marketplace.json 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.
- 6d ago First seen · 24 lines scan A 97c01ad91c69
addy-agent-skills marketplace is a plugin published in the GitHub repository addyosmani/agent-skills (92,284 stars, last pushed yesterday), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. 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 2026-08-30.
Other plugins, from other repositories
borhen-skillengine marketplace
Production-grade engineering skills for AI coding agents — covering the full software development lifecycle from spec to ship.
skillengine
Production-grade engineering skills for AI coding agents — covering the full software development lifecycle from spec to ship.
addy-agent-skills marketplace
Plugin marketplace listing 1 plugin: agent-skills.
agent-skills
面向 AI coding agents 的生产级工程 skills — 覆盖从 spec 到 ship 的完整软件开发生命周期。.
claude-node-typescript-runtime-package-starter
plugin-kit-ai plugin.
funnel
Connect your AI agent to Funnel marketing data to compare cross-channel performance, track pacing, and analyze campaigns.