What problem does it solve? CopilotKit APIs change frequently and version mismatches between v1 and v2 surfaces cause subtle runtime failures. This Skill grounds every CopilotKit task in the installed MDE packages (1.55.2) and pinned official upstream documentation instead of stale memory or latest-main examples. ## Core Features & Use Cases - Runtime and React wiring: Owns the same-origin /api/copilotkit route, v2 provider/hooks from @copilotkit/react-core/v2, and stable provider props. - AG-UI and frontend tools: Aligns CopilotKit tool/action names with Mastra tool-map keys and validates tool result streaming and generative UI rendering. - CLI verification and debugging: Runs npx copilotkit@4.10.0 verify --json before manual debugging and classifies failures across wiring, transport, and Mastra bridge boundaries. - Use Case: When a Mastra search tool executes but its CopilotKit card never renders, use this Skill to check the action-name contract, AG-UI result flow, and the rendered browser path. ## Quick Start Use the copilotkit skill to diagnose why the /api/copilotkit stream returns 500 after a runtime change.