GenerateContentRequest.contents[3].parts: contents.parts must not be empty

[simonw]

Got this while trying out tools against the new 2.5 Flash Lite in:

• Gemini 2.5 Flash Lite is GA now #99

llm 'what version of LLM?' -T llm_version -m gemini/gemini-2.5-flash-lite --td

Tool call: llm_version({})
  0.26

llm -c 'print it'

Error: * GenerateContentRequest.contents[3].parts: contents.parts must not be empty.

[simonw]

On the one hand, Flash Lite is misbehaving here: 2.5 Pro does the right thing, but Flash Lite for some reason sometimes forgets to print an answer.

But the -c should still work - looks like this code is at fault:

llm-gemini/llm_gemini.py

Lines 339 to 344 in b7f723b

	messages.append({"role": "user", "parts": parts})
	model_parts = []
	response_text = response.text_or_raise()
	if response_text:
	model_parts.append({"text": response_text})
	tool_calls = response.tool_calls_or_raise()

[simonw]

Removing the if response_text: check seems to work around the bug.