Update tools.py

tools.py

@@ -0,0 +1,52 @@
+"""Tool definitions for LangGraph agent."""
+from langchain_core.tools import tool
+from langchain_community.document_loaders import WikipediaLoader, ArxivLoader
+from langchain_community.tools.tavily_search import TavilySearchResults
+
+@tool
+def multiply(a: int, b: int) -> int:
+    """Multiply two numbers."""
+    return a * b
+
+@tool
+def add(a: int, b: int) -> int:
+    """Add two numbers."""
+    return a + b
+
+@tool
+def subtract(a: int, b: int) -> int:
+    """Subtract two numbers."""
+    return a - b
+
+@tool
+def divide(a: int, b: int) -> float:
+    """Divide two numbers."""
+    if b == 0:
+        raise ValueError("Cannot divide by zero.")
+    return a / b
+
+@tool
+def modulus(a: int, b: int) -> int:
+    """Get modulus of two numbers."""
+    return a % b
+
+@tool
+def wiki_search(query: str) -> str:
+    """Search Wikipedia for a query and return top results."""
+    docs = WikipediaLoader(query=query, load_max_docs=2).load()
+    return "\n\n".join(doc.page_content for doc in docs)
+
+@tool
+def arxiv_search(query: str) -> str:
+    """Search Arxiv for a query and return top results."""
+    docs = ArxivLoader(query=query, load_max_docs=2).load()
+    return "\n\n".join(doc.page_content[:1000] for doc in docs)
+
+@tool
+def web_search(query: str) -> str:
+    """Search the web using Tavily."""
+    docs = TavilySearchResults(max_results=3).invoke(query=query)
+    return "\n\n".join(doc.page_content for doc in docs)
+
+# Export list of all tools
+TOOLS = [multiply, add, subtract, divide, modulus, wiki_search, arxiv_search, web_search]