Gemma issues

I am trying to change to Gemma using the workers-ai-provider.

When I use @cf/google/gemma-3-12b-it there is no replies from the agent.
When I use @cf/google/gemma-2b-it-lora the bot responds but disregarding the System prompt and I am unable to use tools.

I know that Gemma does not use the "System" prompt. I have been making changes to the code but nothing seems to work.

My latest attempt was this:

` const systemPrompt = {
role: "system",
content: `You are a pirate. Always respond like a pirate, matey!

${unstable_getSchedulePrompt({ date: new Date() })}

If the user asks to schedule a task, use the schedule tool to schedule the task.
`
};

const finalMessages = [
systemPrompt,
...processedMessages,
];

const result = streamText({
model,
messages: finalMessages,
tools: allTools,
onFinish: async (args) => {
onFinish(args as Parameters>[0]);
},
onError: (error) => {
console.error("Error while streaming:", error);
},
maxSteps: 10,
});

// Merge the AI response stream with tool execution outputs
result.mergeIntoDataStream(dataStream);
},
});
`

Start by reproducing the two model cases using the shown streamText call, model values, messages, tools, and maxSteps configuration. Trace how the workers-ai-provider handles Gemma system messages and tool calls; done means @cf/google/gemma-3-12b-it replies and @cf/google/gemma-2b-it-lora follows the system prompt and can use tools.

Written by the indexing model from the issue text.