Google Agentic Architect - Subconcept 2.3: Agent Skills Packaging

Detail the modern, modular developer lifecycle for building and deploying "Agent Skills." Explain how skills package behavioral instructions, tool schemas, and dependency manifests (such as skill.yaml files) into immutable, versioned OCI artifacts distributed via Google Cloud Artifact Registry. Walk through the practical developer workflow: how to scaffold a new skill, use the Google Agents CLI ("agents-cli") to run multi-turn simulation benchmarks inside the Google Antigravity local sandbox, and wire up continuous deployment pipelines to publish and promote skills safely across environments.