feat: define tool parameters with JSON schema instead of Zod

[doowb]

Description

I'm trying to use streamText with a plain tools object where the parameters on each tool valid JSON schema. This works fine when I use the openai sdk (with a tools array), but I get the following error before the request is even made:

TypeError: Cannot read properties of undefined (reading 'typeName')

Code example

import { openai } from '@ai-sdk/openai';
import { streamText } from 'ai';

const response = await streamText({
  model: openai('gpt-4o'),
  prompt: 'This is a prompt',
  tools: {
    my_tool: {
      description: 'A tool that does something',
      parameters: {
        param1: {
          type: 'string',
          description: 'A parameter that does something'
        }
      }
    }
  }
});

Additional context

No response

[nicoalbanese]

Hi - sorry you're running into issues! This error is because the SDK uses Zod for the parameters schema.

Try this:

import { openai } from '@ai-sdk/openai';
import { streamText } from 'ai';
import { z } from "zod";

const response = await streamText({
  model: openai('gpt-4o'),
  prompt: 'This is a prompt',
  tools: {
    my_tool: {
      description: 'A tool that does something',
      parameters: z.object({
        param1: z.string().describe('A parameter that does something')
        }),
      }
    }
  }
});

[doowb]

Is there anyway to do this without zod? Or would this project be open to supporting JSON Schemas?

I'm mainly interested in this because my tool schemas are JSON Schemas and stored as JSON strings, which I've been using with the openai sdk and the previous stream helpers with ai.

[amcclure-super]

If helpful, there are some npm libraries like Json-Schema-to-Zod (https://www.npmjs.com/package/json-schema-to-zod) and Zod to Json Schema (https://www.npmjs.com/package/zod-to-json-schema) that might be of use

[lgrammel]

Duplicates #1062

[lgrammel]

implemented in #2386