From 9b09cb5c63a07b042fa8e02b04e1445f8e7618a3 Mon Sep 17 00:00:00 2001
From: Kiplangat Korir <153384040+kiplangatkorir@users.noreply.github.com>
Date: Mon, 2 Feb 2026 20:52:30 +0300
Subject: [PATCH] Update nanobot/agent/tools/base.py

Co-authored-by: sourcery-ai[bot] <58596630+sourcery-ai[bot]@users.noreply.github.com>
---
 nanobot/agent/tools/base.py | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/nanobot/agent/tools/base.py b/nanobot/agent/tools/base.py
index 355150f..5888a77 100644
--- a/nanobot/agent/tools/base.py
+++ b/nanobot/agent/tools/base.py
@@ -51,8 +51,14 @@ class Tool(ABC):
         Unknown params are ignored.
         """
         schema = self.parameters or {}
-        if schema.get("type") != "object":
-            return []
+
+        # Default to an object schema if type is missing, and fail fast on unsupported top-level types.
+        if "type" not in schema:
+            schema = {"type": "object", **schema}
+        elif schema.get("type") != "object":
+            raise ValueError(
+                f"Tool parameter schemas must have top-level type 'object'; got {schema.get('type')!r}"
+            )
 
         return self._validate_schema(params, schema, path="")