Mistral object generation fails with `mode: tool`

[YousefED]

Description

To reproduce:

const model = createMistral({
    apiKey: "KEY",
  })("ministral-8b-latest");

  const ret = await streamObject({
    model,
    mode: "tool",
    // output: "object" as const,
    prompt: "return hello world",
    schema: jsonSchema({
      type: "object",
      required: ["text"],
      properties: {
        text: {
          type: "string",
        },
      },
    }),
    onError(error) {
      console.log(error);
    },
  });

results in

{"detail":[{"type":"extra_forbidden","loc":["body","tools","list[Tool]",0,"function","type"],"msg":"Extra inputs are not permitted","input":"function"},{"type":"string_type","loc":["body","tools","list[str]",0],"msg":"Input should be a valid string","input":{"type":"function","function":{"type":"function","name":"json","description":"Respond with a JSON object.","parameters":{"type":"object","required":["text"],"properties":{"text":{"type":"string"}}}}}}]}

AI SDK Version

"ai": "^4.3.15",
"@ai-sdk/mistral": "^1.2.8",

[lgrammel]

Can you try with a zod schema and log the used schema from result.response.body?

I want to make sure the JSON schema is matching what Mistral expects.

[YousefED]

This is the value sent as tools when using jsonSchema:

[
  {
    type: "function",
    function: {
      type: "function",
      name: "json",
      description: "Respond with a JSON object.",
      parameters: {
        type: "object",
        required: [
          "text",
        ],
        properties: {
          text: {
            type: "string",
          },
        },
      },
    },
  },
]

I think the second nesting or double type: function is not what mistral expects.

using zod results in the same error

Could this be the culprit?

[lgrammel]

the mode option has been removed in ai sdk 5

[YousefED]

the mode option has been removed in ai sdk 5

Thanks @lgrammel, great to hear! Does all tool-calling now use the same system? Or is there a place where I can read about the change?