Class: Ollama::PromptAdapters::Gemma4

Inherits:
Base
  • Object
show all
Defined in:
lib/ollama/prompt_adapters/gemma4.rb

Overview

Gemma 4 prompt adapter.

Gemma 4 activates thinking by prepending <|think|> to the system prompt content rather than via a think: true API flag. This adapter injects that tag automatically when think: true is requested.

Multimodal ordering: image/audio parts are expected before text, which is handled by MultimodalInput before messages are built.

Constant Summary collapse

THINK_TAG = 
"<|think|>"
TOOL_INSTRUCTION = 
"\n\nYou have access to tools. If a tool can help answer the user question, " \
"call it using the provided function schema."

Instance Attribute Summary

Attributes inherited from Base

#profile

Instance Method Summary collapse

Methods inherited from Base

#initialize

Constructor Details

This class inherits a constructor from Ollama::PromptAdapters::Base

Instance Method Details

#adapt_messages(messages, think: false, tools: nil) ⇒ Object

Inject <|think|> into the system message when think is enabled. Also inject tool usage instructions if tools are present.



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# File 'lib/ollama/prompt_adapters/gemma4.rb', line 20

def adapt_messages(messages, think: false, tools: nil)
  system_idx = messages.index { |m| role_of(m) == "system" }

  if system_idx
    messages = messages.dup
    msg = messages[system_idx].dup
    content = content_of(msg)

    # Add thinking tag if requested
    content = "#{THINK_TAG}#{content}" if think && !content.start_with?(THINK_TAG)

    # Add tool instruction if tools present
    content = "#{content}#{TOOL_INSTRUCTION}" if tools&.any? && !content.include?(TOOL_INSTRUCTION)

    set_content(msg, content)
    messages[system_idx] = msg
  elsif think || tools&.any?
    # Create a system message if none exists but we need to inject tags/instructions
    content = +""
    content << THINK_TAG if think
    content << TOOL_INSTRUCTION if tools&.any?
    messages = [{ role: "system", content: content }] + messages
  end

  messages
end

#inject_think_flag? ⇒ Boolean

Gemma 4 uses the system-prompt tag — do NOT send think: true to API.

Returns:

  • (Boolean) 


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# File 'lib/ollama/prompt_adapters/gemma4.rb', line 48

def inject_think_flag?
  false
end