**everything-claude-code** is a GitHub repository providing an agent harness performance optimization system for Claude Code, Codex, Opencode, and Cursor.

It includes skills, instincts, memory optimization, continuous learning, security scanning, hooks, commands, and MCP configurations developed over 10+ months. Version 1.8.0 adds harness commands, hook reliability improvements, NanoClaw v2, and cross-harness compatibility, with over 50K stars and support for 5 languages.