AI SDK Integration

AI SDK is a free open-source library for building AI-powered products. You can seamlessly integrate it with oRPC without any extra overhead.

Requires AI SDK v5.0.0 or later.

Server

Use streamToEventIterator to convert AI SDK streams to oRPC Event Iterators.

import { os, streamToEventIterator, type } from '@orpc/server'
import { convertToModelMessages, streamText, UIMessage } from 'ai'
import { google } from '@ai-sdk/google'

export const chat = os
  .input(type<{ chatId: string, messages: UIMessage[] }>())
  .handler(async ({ input }) => {
    const result = streamText({
      model: google('gemini-1.5-flash'),
      system: 'You are a helpful assistant.',
      messages: await convertToModelMessages(input.messages),
    })

    return streamToEventIterator(result.toUIMessageStream())
  })

Client

Convert the event iterator back to a stream using eventIteratorToStream or eventIteratorToUnproxiedDataStream.

import { useChat } from '@ai-sdk/react'
import { eventIteratorToUnproxiedDataStream } from '@orpc/client'

export function Example() {
  const { messages, sendMessage, status } = useChat({
    transport: {
      async sendMessages(options) {
        return eventIteratorToUnproxiedDataStream(await client.chat({
          chatId: options.chatId,
          messages: options.messages,
        }, { signal: options.abortSignal }))
      },
      reconnectToStream() {
        throw new Error('Unsupported')
      },
    },
  })
  // render UI...
}

Prefer eventIteratorToUnproxiedDataStream because AI SDK uses structuredClone, which doesn't support proxied data.

implementTool helper

Implements a procedure contract as an AI SDK tool.

import { oc } from '@orpc/contract'
import { AI_SDK_TOOL_META_SYMBOL, AiSdkToolMeta, implementTool } from '@orpc/ai-sdk'
import { z } from 'zod'

interface ORPCMeta extends AiSdkToolMeta {}
const base = oc.$meta<ORPCMeta>({})

const getWeatherContract = base
  .meta({ [AI_SDK_TOOL_META_SYMBOL]: { title: 'Get Weather' } })
  .route({ summary: 'Get the weather in a location' })
  .input(z.object({ location: z.string() }))
  .output(z.object({ location: z.string(), temperature: z.number() }))

const getWeatherTool = implementTool(getWeatherContract, {
  execute: async ({ location }) => ({
    location,
    temperature: 72 + Math.floor(Math.random() * 21) - 10,
  }),
})

createTool helper

Converts a procedure into an AI SDK Tool.

import { os } from '@orpc/server'
import { AI_SDK_TOOL_META_SYMBOL, AiSdkToolMeta, createTool } from '@orpc/ai-sdk'
import { z } from 'zod'

const getWeatherProcedure = os
  .meta({ [AI_SDK_TOOL_META_SYMBOL]: { title: 'Get Weather' } })
  .route({ summary: 'Get the weather in a location' })
  .input(z.object({ location: z.string() }))
  .output(z.object({ location: z.string(), temperature: z.number() }))
  .handler(async ({ input }) => ({
    location: input.location,
    temperature: 72,
  }))

const getWeatherTool = createTool(getWeatherProcedure, { context: {} })