GitHub Ships Agent Skills CLI and Semantic Codebase Indexing: gh skill Command for Discovery, Install, and Publishing; #codebase Goes Purely Semantic

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GitHub launched two significant Copilot infrastructure changes on April 16. First, the gh skill CLI command lets developers discover, install, manage, and publish agent skills from GitHub repositories — turning skills into a first-class package ecosystem. Second, the #codebase tool is now purely semantic with a single unified index managed automatically by VS Code — no manual configuration, results based on meaning rather than substring matching. Together they signal GitHub's shift from code completion to an agent-orchestration platform.