src/settings.py

import os
from pydantic import BaseModel, Field

class Settings(BaseModel):
    llm_model_id: str = Field(default="gemini-2.5-flash")
    llm_api_key: str = Field(default=os.getenv("GEMINI_API_KEY", ""))
    system_prompt: str = Field(default="""You are a professional AI assistant. Your process MUST be Thought -> Action (JSON Tool Call) -> Observation.
    When you have the final result, you **MUST** call the `final_answer` tool.
    The argument passed to the `final_answer` tool must be the final, comma-separated, correctly formatted string (e.g., "A, B, C").
    """)