address review comments from bot

Author: douglas-reid

contributing/samples/hello_world_gemma/agent.py

@@ -45,7 +45,7 @@ async def check_prime(nums: list[int]) -> str:
   """
   primes = set()
   for number in nums:
-    number = int(number)
+    number = number
     if number <= 1:
       continue
     is_prime = True

src/google/adk/models/google_llm.py

@@ -20,6 +20,7 @@
 import json
 import logging
 import os
+import re
 import sys
 from typing import Any
 from typing import AsyncGenerator
@@ -424,6 +425,8 @@ def _remove_display_name_if_present(
 class Gemma(Gemini):
   """Integration for Gemma models exposed via the Gemini API.
 
+  Only Gemma 3 models are supported at this time.
+
   For full documentation, see: https://ai.google.dev/gemma/docs/core/
 
   NOTE: Gemma does **NOT** support system instructions. Any system instructions
@@ -442,9 +445,7 @@ class Gemma(Gemini):
   usage via the Gemini API.
   """
 
-  model: str = (
-      'gemma-3-27b-it'  # Others: [gemma-3-1b-it, gemma-3-4b-it, gemma-3-12b-it]
-  )
+  model: str = 'gemma-3-27b-it'  # Others: [gemma-3-1b-it, gemma-3-4b-it, gemma-3-12b-it]
 
   @classmethod
   @override
@@ -456,7 +457,7 @@ def supported_models(cls) -> list[str]:
     """
 
     return [
-        r'gemma-.*',
+        r'gemma-3.*',
     ]
 
   @cached_property
@@ -473,7 +474,7 @@ async def _preprocess_request(self, llm_request: LlmRequest) -> None:
 
       # NOTE: if history is preserved, we must include the system instructions ONLY once at the beginning
       # of any chain of contents.
-      if len(contents) >= 1:
+      if contents:
         if contents[0] != instruction_content:
           # only prepend if it hasn't already been done
           llm_request.contents = [instruction_content] + contents
@@ -642,8 +643,6 @@ def gemma_functions_after_model_callback(
     return
 
   try:
-    import re
-
     json_candidate = None
 
     markdown_code_block_pattern = re.compile(
@@ -699,7 +698,6 @@ def _get_last_valid_json_substring(text: str) -> tuple[bool, str | None]:
   decoder = json.JSONDecoder()
   last_json_str = None
   start_pos = 0
-  first_brace_index = 0
   while start_pos < len(text):
     try:
       first_brace_index = text.index('{', start_pos)