Model Context Protocol
modelcontextprotocol/modelcontextprotocol
The USB-C of AI applications — the standard for tools and context.
MCP standardizes how applications provide context and tools to LLMs — servers expose tools, resources and prompts over a JSON-RPC protocol. Adopted by OpenAI, Google, Microsoft and effectively the whole ecosystem, it is the connective tissue of modern harnesses.
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OpenClaw
openclaw/openclaw
The viral open-source personal AI assistant that really does things.
OpenClaw (born as Clawdbot in late 2025) is a self-hosted personal agent that connects your chats, email, browser and terminal into one always-on assistant. Its explosive growth — hundreds of thousands of stars within months — made 'personal agent harness' a mainstream category.
superpowers
obra/superpowers
An agentic skills framework and software methodology that works.
superpowers is the most-adopted skills pack in harness engineering: skills, instincts, memory, security and research-first workflows for Claude Code and 13 other harnesses (Codex, Cursor, opencode, Gemini CLI and more). Treats harness engineering itself as the discipline.
Anthropic Skills
anthropics/skills
The official Agent Skills repository.
Anthropic's official Agent Skills: SKILL.md-based folders (instructions, scripts, resources) that Claude dynamically loads in Claude Code, Claude.ai and the API. The reference implementation for progressive-disclosure skill packs.