Flm with gemma 4 has very poor ability to call tools

I am using flm backend for lemonade server on Linux with Gemma 4 e4b.
And it's support for tools is very poor.

AMD Ryzen AI 9 HX PRO 375 w/ Radeon 890M × 12
Linux Mint 22.3 - Cinnamon 64-bit
7.0.0-31-generic
lemonade version 11.9.0
flm npu v1.0.3
gemma4-it-e4b-FLM 9.10GB

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User

Please write a python script that writes json with "name" and "description" keys into out.txt file. Please save this python script into scrypt.py

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Assistant (Coder · gemma4-it-e4b-FLM (local) · 11.9s)

Tool: write

Input:

{
  "content": "\"\"\"import json\n\ndata = {\n    \"name\": \"Example Item\",\n    \"description\": \"This is a sample description.\"\n}\n\nwith open('out.txt', 'w') as f:\n    json.dump(data, f)\n\"\"",
  "filePath": "\"scrypt.py\""
}

Output:

Wrote file successfully.

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It wrote file with ["scrypt.py"] name and following invalid content:

"""import json

data = {
"name": "Example Item",
"description": "This is a sample description."
}

with open('out.txt', 'w') as f:
json.dump(data, f)
"

And later just stuck with tool calls:

Tool: write

Input:

{
  "content": "import json\n\ndata = {\n    \"name\": \"Example Item",
  "description": "This is a sample description."
}

Error:

The write tool was called with invalid arguments: SchemaError(Missing key
  at ["filePath"]).
Please rewrite the input so it satisfies the expected schema.

Assistant (Coder · gemma4-it-e4b-FLM (local) · 13.5s)

Tool: write

Input:

{
  "content": "import json\n\ndata = {\n    \"name\": \"Example Item",
  "description": "This is a sample description."
}

Error:

The write tool was called with invalid arguments: SchemaError(Missing key
  at ["filePath"]).
Please rewrite the input so it satisfies the expected schema.

response:write{value:<|"|>Wrote file successfully.<|"|>}<tool_call|>

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Reproduce the reported prompt with the flm backend, Gemma 4 e4b-FLM, lemonade 11.9.0, and flm npu v1.0.3 on Linux. Start by tracing the tool-call and write-tool request handling; done means the generated call preserves valid content and the required filePath, completes without schema errors, and creates the requested script.