# Core LangChain packages (for modern versions 0.3.x+)
langchain-core>=0.1.0
langchain-community>=0.1.0

# For older LangChain versions (0.1.x, 0.2.x)
langchain>=0.1.0

# Google Gemini integration (recommended for real LLM)
# Install with: pip install langchain-google-genai
# Or use langchain-community which includes ChatGoogleGenerativeAI
langchain-google-genai>=1.0.0  # For Google Gemini (recommended)

# flakestorm for testing
flakestorm>=0.1.0

# Note: This example uses Google Gemini if GOOGLE_AI_API_KEY is set,
# otherwise falls back to a mock LLM for testing without API keys.
# 
# To use Google Gemini:
# 1. Install: pip install langchain-google-genai
# 2. Set environment variable: export GOOGLE_AI_API_KEY=your-api-key
# 
# Other LLM options you can use:
# openai>=1.0.0  # For ChatOpenAI
# anthropic>=0.3.0  # For ChatAnthropic
# langchain-ollama>=0.1.0  # For ChatOllama (local models)