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Fix VertexAI Empty Model Parts Error#2203

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Merged

Kludex merged 4 commits intopydantic:mainfromcaesarnine:fix/google-model-empty-parts-error

Jul 17, 2025

Merged

Fix VertexAI Empty Model Parts Error#2203

Kludex merged 4 commits intopydantic:mainfromcaesarnine:fix/google-model-empty-parts-error

Jul 17, 2025

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caesarnine commentedJul 14, 2025

Fixes this error that occurs with VertexAI Gemini models fairly often in my experience.

Issue that's open with the same error:#2032

ClientError: 400 INVALID_ARGUMENT. {'error': {'code': 400, 'message': 'Unable to submitrequest because it must include at least one parts field, which describes the promptinput. Learn more:https://cloud.google.com/vertex-ai/generative-ai/docs/model-reference/gemini', 'status':'INVALID_ARGUMENT'}}

Due to the last message being something like:

    {        "parts": [{ "content": "", "part_kind": "text" }],        "usage": {            "requests": 1,            "request_tokens": 25308,            "response_tokens": 0,            "total_tokens": 25308,            "details": {                "cached_content_tokens": 15171,                "text_cache_tokens": 15171,                "text_prompt_tokens": 25308            }        },        "model_name": "gemini-2.5-pro",        "timestamp": "2025-07-14T17:33:52.568858Z",        "kind": "response",        "vendor_details": { "finish_reason": "STOP" },        "vendor_id": "fz91aPDpJYienvgP757VgQ0"    }

Tested the change against a session that was previously hard crashing and it works fine now.