Open Source Agent Skills
Discover 25 open source Agent Skills repositories from GitHub, each with an analysis of what it does, key features, use cases and alternatives. Agent Skills projects here are most often combined with AI Agents, AI and Developer Tools. Last updated October 3, 2026.
25 repositories · updated October 3, 2026
SkillOpt: Train Reusable Skills for Frozen LLM Agents
SkillOpt improves natural-language agent skills using scored task trajectories and validation-gated edits, without changing the target model's weights. It is aimed at teams that can evaluate repeatable tasks and want to deploy a reusable skill document.
frontend-slides: Create HTML Presentations with a Coding Agent
Frontend Slides is an agent skill for building styled web presentations from a brief or an existing PowerPoint. It suits people who want to choose a visual direction without writing CSS, then customize or share the resulting HTML deck.
loopy: Find and Run Repeatable AI-Agent Workflows
Loopy is an installable skill for discovering, adapting, creating, and running bounded AI-agent workflows called loops. It works with the separate Loop Library catalog and suits people who want repeatable tasks with explicit checks and stopping points.
claude-ads: Audit and Manage Paid Advertising with Claude
Claude Ads helps agencies and performance teams audit, plan, monitor, and report on paid-media accounts across 12 platforms. It is read-only by default, with account changes gated by explicit approval and safety checks.
superpowers: Guide Coding Agents Through Software Development
Superpowers adds a structured development methodology to coding agents, from clarifying requirements and planning through test-driven implementation and review. It suits developers who want repeatable workflows across supported agent tools.
compound-engineering-plugin: Guide AI Agents Through Engineering Work
Compound Engineering provides reusable skills for AI coding agents, guiding work from brainstorming and planning through implementation, review, and captured learnings. It supports multiple agent hosts, including Claude Code, Cursor, and Codex.
agency-agents: Install Role-Specific AI Agent Instructions
A large collection of specialized AI agent instruction files, organized by professional role and supported by scripts for installing them into compatible coding tools. Useful when you want reusable role-specific workflows rather than a single general-purpose prompt.
humanizer: Edit AI-Written Text into Plainer Prose
Humanizer is an agent skill for revising AI-written text while preserving its meaning and factual details. Use it in supported coding agents or other skill-compatible tools when you want clearer, less formulaic prose.
skills: Apply Engineering Workflows to Coding Agents
A collection of composable agent skills that brings engineering practices such as requirements clarification, TDD, debugging, and code design into coding-agent workflows. It suits developers who want to guide agents without adopting an end-to-end process framework.
skills: Add .NET Skills to AI Coding Agents
A curated collection of portable skills and host-specific agents for .NET and C# coding agents. It helps agents handle development, testing, upgrades, diagnostics, and other specialized .NET tasks.
Anthropic-Cybersecurity-Skills: Give AI Agents Security Playbooks
A library of structured cybersecurity workflows for AI agents, covering 34 security domains and mapped to six industry frameworks. Use it to provide compatible agents with practical guidance for authorized security work.
flyai-skill: Search Travel and Booking Options with AI Agents
FlyAI connects Claude Code, OpenClaw, and compatible agents to Fliggy travel search through a command-line tool. Use it to find flights, hotels, trains, attractions, and other travel services and receive structured results with booking links.