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GitHub project nidhinjs/prompt-master ships a Claude skill that generates sharper prompts for 30+ AI tools including Claude, ChatGPT, Cursor, and Midjourney, cutting down trial and error.

The GitHub project ai-website-cloner-template offers a /clone-website skill that lets an AI coding agent turn any URL into an editable Next.js 16 project.

The GitHub project multica-ai/andrej-karpathy-skills released a single CLAUDE.md file that uses four principles to constrain Claude Code from making wrong assumptions, overcomplicating, and making unrelated changes.

The open-source project agentmemory hit No. 1 on GitHub Trends with persistent memory support for Claude Code and 20+ other coding agents.

An open-source project on GitHub gives AI agents 818 structured cybersecurity skills across 34 security domains, mapped to 6 frameworks including MITRE ATT&CK and NIST CSF 2.0.

The ComposioHQ/awesome-claude-skills project on GitHub curates a list of over 1,000 production-grade Claude Skills and plugins.

VoltAgent has compiled and released a collection of over 1,000 Agent Skills from official developer teams and the community, spanning 60+ organizations including Claude, Stripe, MongoDB and OpenAI.

A GitHub repo called system_prompts_leaks continuously collects the full original system prompts of major chatbots including Anthropic, OpenAI, Google, and xAI.

Egonex-AI open-sourced Understand-Anything, a multi-agent pipeline that turns codebases, knowledge bases, or documents into an interactive knowledge graph you can explore, search, and query.

The last30days skill ships v3.11.1, merging 175 PRs since v3.3 with first-class Codex support, free arXiv/Techmeme/Digg sources, and a rebuilt X search.

Volcengine has open-sourced OpenViking on GitHub, using a viking:// virtual filesystem to unify an agent's knowledge, memory, and skills.

CodeGraph is a locally pre-indexed code knowledge graph that plugs into Claude Code, Codex, Cursor and other coding agents, offering semantic code retrieval over MCP and auto-syncing as code changes.