streamText is stuck in a loop when using tools with required

[punkpeye]

The code:

const { fullStream } = await streamText({
  abortSignal: signal,
  maxSteps: 20,
  messages: relevantMessages,
  model,
  toolChoice: 'required',
  tools,
});

for await (const chunk of fullStream) {
  // ...

The logs show:

{
  type: 'tool-call',
  toolCallId: 'call_b0DkOmitAwd93Mt4xXd6u1gH',
  toolName: 'searchWeb',
  args: { query: 'What is the capital of France?' }
}
{
  type: 'tool-result',
  toolCallId: 'call_b0DkOmitAwd93Mt4xXd6u1gH',
  toolName: 'searchWeb',
  args: { query: 'What is the capital of France?' },
  result: {
    answer: 'The capital of France is Paris.',
    sources: [
      {
        name: 'What is the Capital of France? - WorldAtlas',
        snippet: "Learn about the history, geography, economy, tourism, and administration of Paris, the capital city of France and the country's largest city.",
        url: 'https://www.worldatlas.com/articles/what-is-the-capital-of-france.html'
      },
      {
        name: 'France | History, Maps, Flag, Population, Cities, Capital, & Facts ...',
        snippet: 'The capital and by far the most important city of France is Paris, one of the world’s preeminent cultural and commercial centres.',
        url: 'https://www.britannica.com/place/France'
      },
      {
        name: 'Paris - Wikipedia',
        snippet: 'Paris is the capital and largest city of France.',
        url: 'https://en.wikipedia.org/wiki/Paris'
      }
    ]
  }
}
{
  type: 'step-finish',
  finishReason: 'tool-calls',
  usage: { promptTokens: 456, completionTokens: 20, totalTokens: 476 },
  experimental_providerMetadata: { openai: { reasoningTokens: 0, cachedPromptTokens: 0 } },
  logprobs: undefined,
  response: {
    id: 'chatcmpl-AZpStkvY5DoWFRuCTA0L5hk1hOMOI',
    timestamp: 2024-12-02T01:24:35.000Z,
    modelId: 'gpt-4o-2024-11-20'
  },
  isContinued: false
}
{
  type: 'tool-call',
  toolCallId: 'call_4jKKKQAlZwguD1glEhCPAbDI',
  toolName: 'searchWeb',
  args: { query: 'capital of France' }
}

and just keeps going in a loop, seemingly with no end to it

Note: I am only using streamText, not using other parts of ai sdk.

[punkpeye]

I downgraded several versions. Looks like the same issue exists in every version.

[punkpeye]

Yeah, it is a bug #3944

[nicoalbanese]

Closing as discussion happening on the issue.