Update requirements.txt

requirements.txt

@@ -1,21 +1,34 @@
 gradio
 requests
-# --- Vector & retrieval
-faiss-cpu==1.8.0.post1
-sentence-transformers==2.7.0
-langchain-community==0.2.10
-langchain-core==0.2.23
-langchain-huggingface==0.0.3
+# Core LangChain and LangGraph Framework
+# These are the fundamental building blocks for your agent.
+langchain
+langgraph
 
-# --- LangGraph agent framework
-langgraph==0.2.15
+# LangChain Community and Integration Packages
+# These packages allow LangChain to connect to various models, services, and data sources.
+langchain-community
+langchain-google-genai   # For Google Gemini models
+langchain-groq           # For Groq models
+langchain-huggingface    # For Hugging Face models and embeddings
 
-# --- LLM providers
-langchain-google-genai==1.0.8
-langchain-groq==0.1.6
-langchain-huggingface==0.0.3          # (listed twice, safe)
+# Vector Store and Embeddings
+# Used for creating and searching your local knowledge base of Q&A examples.
+faiss-cpu                # For the FAISS vector store (CPU version is best for HF Spaces)
+sentence-transformers    # The model used to generate text embeddings
 
-# --- Tools & utilities
-pillow==10.4.0
-cachetools==5.4.0
-python-dotenv==1.0.1
+# Tool-Specific Dependencies
+# Each tool that connects to an external service needs its own client library.
+tavily-python            # For the Tavily web search tool
+wikipedia                # For the Wikipedia search tool
+arxiv                    # For the Arxiv scientific paper search tool
+
+# Utility Libraries
+python-dotenv            # For loading API keys from a .env file
+requests                 # For making HTTP requests (used in the describe_image tool)
+Pillow                   # For image processing (used in the describe_image tool)
+cachetools               # For in-memory caching of API results to improve speed
+
+# This is often installed as a dependency of other HF packages, but it's good
+# practice to list it explicitly as HuggingFaceEndpoint is used.
+huggingface_hub