Microsoft Copilot Studio is one product with two licensing tiers — and the Agent Registry approval step that makes an agent visible org-wide is the step most publishing tutorials end one screen before. This post maps the complete authoring surface: all eight knowledge source types with their verified limits, the "Actions" to "Tools" terminology rename and what changed, MCP integration confirmed GA since May 2025 with the federated-connector distinction explained, and the five-step publishing path to Microsoft 365 Copilot including the admin center approval step makers most often miss.