add tools.py

tools.py

@@ -0,0 +1,17 @@
+"""
+Utility tools used by the deep agent.
+
+The functions are decorated with `@tool` from langchain and can be called by the agent.
+"""
+
+from langchain.tools import tool
+
+@tool
+def echo(text: str) -> str:
+    """Return the same text – useful for demonstration."""
+    return f"Echo: {text}"
+
+@tool
+def add(a: int, b: int) -> int:
+    """Add two integers."""
+    return a + b