CopilotKit v1 to v2 Migration Skill
Live Documentation (MCP)
This plugin includes an MCP server (copilotkit-docs) that provides search-docs and search-code tools for querying live CopilotKit documentation and source code. Useful for looking up current v2 API signatures during migration.
- Claude Code: Auto-configured by the plugin's
.mcp.json-- no setup needed. - Codex: Requires manual configuration. See the copilotkit-debug skill for setup instructions.
Overview
CopilotKit v2 is a ground-up rewrite built on the AG-UI protocol (@ag-ui/client / @ag-ui/core). Users continue to install and import @copilotkit/* packages -- the v2 changes are exposed through the same package names with updated APIs (new hook names, component names, runtime configuration). The @copilotkit/* namespace is an internal implementation detail that users never interact with.
Migration Workflow
1. Audit Current Usage
Scan the codebase for all v1 imports and API usage:
@copilotkit/react-core -> hooks, CopilotKit provider, types
@copilotkit/react-ui -> CopilotChat, CopilotPopup, CopilotSidebar
@copilotkit/react-textarea -> CopilotTextarea (removed in v2)
@copilotkit/runtime -> CopilotRuntime, service adapters, framework integrations
@copilotkit/runtime-client-gql -> GraphQL client, message types
@copilotkit/shared -> utility types, constants
@copilotkit/sdk-js -> LangGraph/LangChain SDK2. Identify Deprecated APIs
Key hooks and components to find and replace:
| v1 API | v2 Replacement |
|---|---|
useCopilotAction | useFrontendTool |
useCopilotReadable | useAgentContext |
useCopilotChat | useAgent + useSuggestions |
useCoAgent | useAgent |
useCoAgentStateRender | useRenderToolCall / useRenderActivityMessage |
useLangGraphInterrupt | useInterrupt |
useCopilotChatSuggestions | useConfigureSuggestions + useSuggestions |
useCopilotAdditionalInstructions | useAgentContext |
useMakeCopilotDocumentReadable | useAgentContext |
CopilotKit (provider) | CopilotKitProvider |
CopilotTextarea | Removed -- use standard textarea + useFrontendTool |
3. Map to v2 Equivalents
Refer to references/v1-to-v2-migration.md for detailed before/after code examples.
4. Update Package Dependencies
The @copilotkit/* package names stay the same. Update to the latest v2 versions:
@copilotkit/react-core -> @copilotkit/react (consolidated into one package)
@copilotkit/react-ui -> @copilotkit/react (consolidated into one package)
@copilotkit/react-textarea -> removed (no v2 equivalent)
@copilotkit/runtime -> @copilotkit/runtime (same package, new agent-based API)
@copilotkit/runtime-client-gql -> removed (replaced by AG-UI protocol, re-exported from @copilotkit/react)
@copilotkit/shared -> @copilotkit/shared (same package)
@copilotkit/sdk-js -> @copilotkit/agent (new package for agent definitions)5. Update Runtime Configuration
The v1 CopilotRuntime accepted service adapters (OpenAI, Anthropic, LangChain, etc.) and endpoint definitions. The v2 CopilotRuntime accepts AG-UI AbstractAgent instances directly.
v1 pattern (service adapter + endpoints):
import { CopilotRuntime, OpenAIAdapter } from "@copilotkit/runtime";
const runtime = new CopilotRuntime({ actions: [...] });
// used with copilotKitEndpoint() for Next.js, Express, etc.v2 pattern (agents + Hono endpoint):
import { CopilotRuntime, createCopilotEndpoint } from "@copilotkit/runtime";
import { BuiltInAgent } from "@copilotkit/agent";
const runtime = new CopilotRuntime({
agents: { myAgent: new BuiltInAgent({ model: "openai:gpt-4o" }) },
});
const app = createCopilotEndpoint({ runtime, basePath: "/api/copilotkit" });6. Update Provider
v1:
import { CopilotKit } from "@copilotkit/react-core";
<CopilotKit runtimeUrl="/api/copilotkit">
{children}
</CopilotKit>v2:
import { CopilotKitProvider } from "@copilotkit/react";
<CopilotKitProvider runtimeUrl="/api/copilotkit">
{children}
</CopilotKitProvider>7. Verify
- Run the application and check for runtime errors
- Verify all agent interactions work (chat, tool calls, interrupts)
- Check that tool renderers display correctly
- Confirm suggestions load and display
Quick Reference
| Concept | v1 | v2 |
|---|---|---|
| Package scope | @copilotkit/* | @copilotkit/* (same scope, updated APIs) |
| Protocol | GraphQL | AG-UI (SSE) |
| Provider component | CopilotKit | CopilotKitProvider |
| Define frontend tool | useCopilotAction | useFrontendTool |
| Share app state | useCopilotReadable | useAgentContext |
| Agent interaction | useCoAgent | useAgent |
| Handle interrupts | useLangGraphInterrupt | useInterrupt |
| Render tool calls | useCopilotAction({render}) | useRenderToolCall |
| Chat suggestions | useCopilotChatSuggestions | useConfigureSuggestions |
| Runtime class | CopilotRuntime (adapters) | CopilotRuntime (agents) |
| Endpoint setup | copilotKitEndpoint() | createCopilotEndpoint() |
| Agent definition | LangGraphAgent endpoint | AbstractAgent / BuiltInAgent |
| Chat components | CopilotChat, CopilotPopup, CopilotSidebar | CopilotChat, CopilotPopup, CopilotSidebar (from @copilotkit/react) |