Invalid parameter: messages with role 'tool' must follow a preceding message with 'tool_calls'.

The 400 status error in the Azure OpenAI API, specifically the error message indicating that the query "is not of type 'object' - 'messages.0'," suggests several potential issues:

Invalid Request Structure

The error indicates that the structure of the request, particularly the messages array, is not correctly formatted. The API expects each element in the messages array to be an object with specific keys (e.g., role and content), but the provided data does not conform to this expectation.

Incorrect Data Type

The API is expecting an object for each message, but the data provided for messages.0 does not match this type. This could be due to a mismatch between the expected and actual data types in the request payload.

API Parameter Validation

The error may also result from invalid or unrecognized parameters in the request. For example, using deprecated or incorrect parameters (like max_completion_tokens instead of max_tokens for certain models) can trigger a 400 error.

In summary, the error is likely due to an incorrectly formatted or typed request payload, specifically within the messages array, which does not align with the API's expected structure and data types.