InvalidToolArgumentsError -> NoOutputGeneratedError after V4 -> V5 Upgrade

[skylarbpayne]

Hey folks,

I'm looking for a bit of guidance around a change we noticed after upgrading AI SDK from V4 -> V5.

Versions:

• ai: 5.0.51
• ai-sdk/openai: 2.0.34

We have a chat use case with streaming, tool calls, and using OpenAI chat completions API with gpt-5. We explicitly set to chat completions before and after.

The only differences in the OpenAI HTTP requests are:

1. Before we were providing temperature=1, after we omit temperature
2. Before the request omitted strict in the tools, and after strict is explicitly set to false

We see a case where we had errors like the following before the upgrade:

AI_InvalidToolArgumentsError: Invalid arguments for tool-update-project: Type validation failed: Value: {"id":"RXc55SPXvdCPz7gHqR3De","name":null,}. Error message: [ { "code": "invalid_type", "expected": "string", "received": "undefined", "path": [ "folderId" ], "message": "Required" } ]

After our upgrade, this error never happens, but we instead get this error (at the ~same rate):

AI_NoOutputGeneratedError: No output generated. Check the stream for errors.

Because it's a very clear switch over; I suspect they have the same root cause. But the latter error is uninformative. So we suspect something in our upgrade caused this; but the error doesn't really contain any information. We are processing error chunks in the stream, and there are no errors we see.

Note: I would provide a minimal reproduction if possible; this seems somewhat ~random. There's not a clear pattern we've been able to discern when this happens.

Any guidance around what to look for is appreciated.

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