Add missing math tools: sqrt, power, absolute - fixes tool validation errors

agent.py

@@ -69,13 +69,44 @@ def divide(a: int, b: int) -> int:
 @tool
 def modulus(a: int, b: int) -> int:
     """Get the modulus of two numbers.
-    
+
     Args:
         a: first int
         b: second int
     """
     return a % b
 
+@tool
+def sqrt(a: float) -> float:
+    """Calculate the square root of a number.
+
+    Args:
+        a: number to find square root of
+    """
+    import math
+    if a < 0:
+        raise ValueError("Cannot calculate square root of negative number.")
+    return math.sqrt(a)
+
+@tool
+def power(a: float, b: float) -> float:
+    """Calculate a number raised to a power (a^b).
+
+    Args:
+        a: base number
+        b: exponent
+    """
+    return a ** b
+
+@tool
+def absolute(a: float) -> float:
+    """Get the absolute value of a number.
+
+    Args:
+        a: number to get absolute value of
+    """
+    return abs(a)
+
 @tool
 def wiki_search(query: str) -> str:
     """Search Wikipedia for a query and return maximum 2 results.
@@ -155,6 +186,9 @@ tools = [
     subtract,
     divide,
     modulus,
+    sqrt,
+    power,
+    absolute,
     wiki_search,
     web_search,
     arvix_search,