Create ref.txt

ref.txt

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+When using the @tool decorator from langchain_core.tools, the function must either:
+- Have a docstring that describes what the tool does, or
+- Provide an explicit description parameter to the decorator.
+
+@tool
+def RAG(state):
+    """Use this tool to execute RAG. If the question is related to Japan or Sports, this tool retrieves the results."""
+
+
+@tool(description="Use this tool to execute RAG. Retrieves results related to Japan or Sports.")
+def RAG(state):