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.
npx agentmods add instructions/addyosmani/agent-skills/agents-mdgit 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/instructions/addyosmani/agent-skills/agents-md)<a href="https://agentmods.dev/instructions/addyosmani/agent-skills/agents-md"><img src="https://agentmods.dev/badge/instructions/addyosmani/agent-skills/agents-md.svg" alt="Measured on agentmods" height="20"></a>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 | $0.01191 | $0.01191 |
| Opus 5 | $0.00596 | $0.00596 |
| Sonnet 5 | $0.00238 | $0.00238 |
| Haiku 4.5 | $0.00119 | $0.00119 |
Grade A, and why
agent-skills AGENTS.md 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
1 near-identical copy found in the catalogue:
- agent-skills AGENTS.md — 94% identical, 2 lines differ
How it starts
The opening of the file, as written. The whole thing — 93 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md
This file provides guidance to AI coding agents (Claude Code, Cursor, Copilot, Antigravity, etc.) when working with code in this repository.
Scope: This file configures agents working on the
addyosmani/agent-skillsrepository itself. It is not meant to be copied into other projects or into a global agent configuration; the reusable assets are the skills inskills/, not this file.
Repository Overview
A collection of skills for Claude.ai and Claude Code for senior software engineers. Skills are packaged instructions and scripts that extend Claude and your coding agents capabilities.
OpenCode Integration
OpenCode uses a skill-driven execution model powered by the skill tool and this repository's /skills directory.
Core Rules
- If a task matches a skill, you MUST invoke it
- Skills are located in
skills/<skill-name>/SKILL.md - Never implement directly if a skill applies
- Always follow the skill instructions exactly (do not partially apply them)
Intent → Skill Mapping
The agent should automatically map user intent to skills:
- Feature / new functionality →
spec-driven-development, thenincremental-implementation,test-driven-development - Planning / breakdown →
planning-and-task-breakdown - Bug / failure / unexpected behavior →
debugging-and-error-recovery - Code review →
code-review-and-quality - Refactoring / simplification →
code-simplification - API or interface design →
api-and-interface-design - UI work →
frontend-ui-engineering
Lifecycle Mapping (Implicit Commands)
OpenCode does not support slash commands like /spec or /plan.
Instead, the agent must internally follow this lifecycle:
- DEFINE →
spec-driven-development - PLAN →
planning-and-task-breakdown - BUILD →
incremental-implementation+test-driven-development - VERIFY →
debugging-and-error-recovery - REVIEW →
code-review-and-quality - SHIP →
shipping-and-launch
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 · 93 lines · 1,191 tokens per session scan A a12bac68c447
agent-skills AGENTS.md is an instructions file published in the GitHub repository addyosmani/agent-skills (92,284 stars, last pushed yesterday), licensed MIT. It adds 1,191 tokens to every session, about $0.0060 per session on Opus 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 2026-08-30.
Other instructions, from other repositories
SkillEngine AGENTS.md
AGENTS.md instructions for borhen68/SkillEngine, covering agents.md, repository overview, opencode integration, core rules and intent → skill mapping.
ai-agent-skills AGENTS.md
Instructions for DevelopersGlobal/ai-agent-skills, covering ai agent instructions for this repository, when working in this repository, repository structure, key principles and when adding a new skill.
SkillEngine CLAUDE.md
Claude Code instructions for borhen68/SkillEngine, covering skillengine, project structure, skills by phase, conventions and commands.
addyosmani-agent-skills-zh AGENTS.md
AGENTS.md instructions for vinvcn/addyosmani-agent-skills-zh, covering agents.md, 仓库概览, opencode 集成, 核心规则 and 意图 → skill 映射.
addyosmani-agent-skills-zh CLAUDE.md
Claude Code instructions for vinvcn/addyosmani-agent-skills-zh, covering agent-skills, 项目结构, 按阶段划分的 skills, 约定 and 命令.
ai-agent-skills CLAUDE.md
Instructions for DevelopersGlobal/ai-agent-skills, covering claude code instructions for ai agent skills, available slash commands, skill application protocol and anti-patterns to avoid.