fix(tools): reject non-finite number parameters

nanobot/agent/tools/base.py

@@ -1,6 +1,7 @@
 """Base class for agent tools."""
 from __future__ import annotations
 
+import math
 import typing
 from abc import ABC, abstractmethod
 from collections.abc import Callable
@@ -67,6 +68,8 @@ class Schema(ABC):
             return [f"{label} should be number"]
         if t in _JSON_TYPE_MAP and t not in ("integer", "number") and not isinstance(val, _JSON_TYPE_MAP[t]):
             return [f"{label} should be {t}"]
+        if t == "number" and isinstance(val, float) and not math.isfinite(val):
+            return [f"{label} must be finite"]
 
         errors: list[str] = []
         if "enum" in schema and val not in schema["enum"]: