Runtime Adapters
LangChainAdapter
CopilotKit Adapter for LangChain
Use this adapter to use LangChain as a backend.
return copilotKit.response(
req,
new LangChainAdapter({
chainFn: async ({ messages, tools }) => {
const model = new ChatOpenAI({ modelName: "gpt-4o" });
return model.stream(messages, { tools });
},
})
);
The async handler function can return:
- a simple
string
response - a LangChain stream
IterableReadableStream
- a LangChain
BaseMessageChunk
object - a LangChain
AIMessage
object
Constructor
chainFn
(parameters: ChainFnParameters) => Promise<LangChainReturnType>
requiredprocess(request: CopilotRuntimeChatCompletionRequest)
request
CopilotRuntimeChatCompletionRequest
required