AI Agentsagent-skillsclaude-codeclaude-code-skills
Installation
# Add to your Claude Code skills
git clone https://github.com/kasperjunge/agent-resources
README.md
agr
A package manager for AI agent skills.
Install, share, and sync skills across Claude Code, Cursor, Codex, OpenCode,
Copilot, and Antigravity — with a single command.
What are skills?
Skills are reusable instructions that teach AI coding agents how to perform
specific tasks. Each skill is a SKILL.md file in a directory, published on
GitHub:
---
name: code-reviewer
description: Reviews code for bugs, security issues, and best practices.
---
# Code Reviewer
When reviewing code changes, follow these steps:
1. Read every changed file completely before commenting
2. Check for bugs: null references, off-by-one errors, race conditions
3. Check for security issues: injection, auth bypass, data exposure
4. Verify error handling: are errors caught, logged, and surfaced?
Format each finding as:
- **File and line:** `src/auth.py:42`
- **Severity:** bug / security / style
- **Fix:** concrete code or approach to resolve it
Install it, and your AI agent gains a new capability — no prompt engineering
each time. Without a package manager, you'd copy these files manually into each
tool's config folder, keep them updated by hand, and hope your teammates have
the same versions. agr automates all of that.
The agent harness performance optimization system. Skills, instincts, memory, security, and research-first development for Claude Code, Codex, Opencode, Cursor and beyond.
Dependencies are tracked in agr.toml — commit it, and teammates install
everything with one command:
dependencies = [
{handle = "anthropics/skills/frontend-design", type = "skill"},
{handle = "anthropics/skills/pdf", type = "skill"},
]
agr sync # Like npm install, but for agent skills
Create and share
agr init my-skill # Scaffold a new skill
# Edit my-skill/SKILL.md with your instructions
agr add ./my-skill # Test locally
# Push to GitHub, then others can:
agr add your-username/my-skill
Python SDK
Use agr as a library to load, discover, and cache skills programmatically:
from agr import Skill, list_skills, skill_info
skill = Skill.from_git("anthropics/skills/code-review")
print(skill.prompt) # SKILL.md contents
print(skill.files) # Files in the skill directory
for info in list_skills("anthropics/skills"):
details = skill_info(info.handle)
print(f"{details.handle}: {details.description}")
See the SDK documentation for
cache management, error handling, and the full API.
Example skills
Documents & data:
agr add anthropics/skills/pdf # Read, extract, create PDFs
agr add anthropics/skills/docx # Generate and edit Word documents
agr add anthropics/skills/xlsx # Build and manipulate spreadsheets
agr add anthropics/skills/pptx # Create and work with slide decks
agr add anthropics/skills/doc-coauthoring # Structured doc co-authoring workflow
Design & frontend:
agr add anthropics/skills/frontend-design # Production-grade interfaces
agr add anthropics/skills/canvas-design # Visual art in PNG and PDF
agr add anthropics/skills/algorithmic-art # Algorithmic art with p5.js
agr add anthropics/skills/theme-factory # Style artifacts with themes
agr add anthropics/skills/brand-guidelines # Anthropic brand colors and typography
Development:
agr add anthropics/skills/claude-api # Build apps with the Claude API
agr add anthropics/skills/mcp-builder # Create MCP servers
agr add anthropics/skills/web-artifacts-builder # Multi-component HTML artifacts
agr add anthropics/skills/webapp-testing # Test web apps with Playwright
