hello_world_gemma4

Hello World — Gemma 4

This sample demonstrates using Gemma 4 with ADK via the standard Gemini class. Gemma 4 supports native function calling and system instructions, so no special workaround classes are needed.

Gemma 4 (this sample)

from google.adk.agents.llm_agent import Agent
from google.adk.models.google_llm import Gemini

root_agent = Agent(
    model=Gemini(model="gemma-4-31b-it"),  # gemma-4-26b-a4b-it or gemma-4-31b-it
    ...
)

Gemma 3

from google.adk.agents.llm_agent import Agent
from google.adk.models.gemma_llm import Gemma

root_agent = Agent(
    model=Gemma(model="gemma-3-27b-it"),
    ...
)

See the hello_world_gemma/ sample for the full Gemma 3 example.

Why separate classes?

The Gemma and Gemma3Ollama classes exist because Gemma 3 lacks native function calling and system instruction support. They provide workarounds by:

• Injecting tool declarations into text prompts
• Parsing function calls from model text responses
• Converting system instructions to user-role messages

Gemma 4 doesn't need any of this — it works natively with the standard Gemini class (via Gemini API) and LiteLlm class (via other providers like Ollama).

Running this sample

# From the repository root
adk run contributing/samples/hello_world_gemma4

Related samples

• hello_world_gemma/ — Gemma 3 via Gemini API
• hello_world_gemma3_ollama/ — Gemma 3 via Ollama