diff --git a/pydantic_ai_slim/pydantic_ai/models/bedrock.py b/pydantic_ai_slim/pydantic_ai/models/bedrock.py
index b54df588b..af5e4acff 100644
--- a/pydantic_ai_slim/pydantic_ai/models/bedrock.py
+++ b/pydantic_ai_slim/pydantic_ai/models/bedrock.py
@@ -55,6 +55,7 @@
         PromptVariableValuesTypeDef,
         SystemContentBlockTypeDef,
         ToolChoiceTypeDef,
+        ToolSpecificationTypeDef,
         ToolTypeDef,
         VideoBlockTypeDef,
     )
@@ -214,14 +215,16 @@ def _get_tools(self, model_request_parameters: ModelRequestParameters) -> list[T
 
     @staticmethod
     def _map_tool_definition(f: ToolDefinition) -> ToolTypeDef:
-        return {
-            'toolSpec': {
-                'name': f.name,
-                'description': f.description,
-                'inputSchema': {'json': f.parameters_json_schema},
-            }
+        tool_spec: ToolSpecificationTypeDef = {
+            'name': f.name,
+            'inputSchema': {'json': f.parameters_json_schema},
         }
 
+        if f.description:
+            tool_spec['description'] = f.description
+
+        return {'toolSpec': tool_spec}
+
     @property
     def base_url(self) -> str:
         return str(self.client.meta.endpoint_url)