The agent-skills repository provides a framework for enhancing AI coding agents with structured engineering workflows called 'skills'. Each skill encodes senior engineer best practices across the software development lifecycle (Define → Plan → Build → Verify → Review → Ship) through opinionated, process-driven guidelines. Skills are invoked automatically based on context or via slash commands and integrate with multiple AI agent tools (Claude Code, Gemini CLI, Antigravity, Codex, etc.) through tool-specific adapters. The system includes a meta-skill for dynamic skill routing, reusable agent personas for specialized tasks, and validation infrastructure to ensure consistency and prevent drift. It is designed to prevent agents from skipping critical steps by mandating concrete evidence (tests, build output) rather than relying on subjective assessments.