fix(bedrock): accept tool_choice="any" on the Converse adapter

litellm/llms/bedrock/chat/converse_transformation.py

@@ -591,7 +591,9 @@ def map_tool_choice_values(
                     message=f"Bedrock doesn't support tool_choice={tool_choice}. To drop it from the call, set `litellm.drop_params = True.",
                     status_code=400,
                 )
-        elif tool_choice == "required":
+        elif tool_choice in ("required", "any"):
+            # Bedrock's native value for "call some tool" is literally `any`,
+            # so accepting "required" while rejecting "any" was incoherent.
             return ToolChoiceValuesBlock(any={})
         elif tool_choice == "auto":
             return ToolChoiceValuesBlock(auto={})
@@ -603,7 +605,7 @@ def map_tool_choice_values(
             return ToolChoiceValuesBlock(tool=specific_tool)
         else:
             raise litellm.utils.UnsupportedParamsError(
-                message=f"Bedrock doesn't support tool_choice={tool_choice}. Supported tool_choice values=['auto', 'required', json object]. To drop it from the call, set `litellm.drop_params = True.",
+                message=f"Bedrock doesn't support tool_choice={tool_choice}. Supported tool_choice values=['auto', 'required', 'any', json object]. To drop it from the call, set `litellm.drop_params = True.",
                 status_code=400,
             )
 

tests/test_litellm/llms/bedrock/chat/test_bedrock_tool_choice_any.py

@@ -0,0 +1,43 @@
+"""`tool_choice="any"` is Bedrock's own native value and must be accepted."""
+
+import pytest
+
+import litellm
+from litellm.llms.bedrock.chat.converse_transformation import AmazonConverseConfig
+
+MODEL = "anthropic.claude-3-haiku-20240307-v1:0"
+
+
+class TestBedrockToolChoiceAny:
+    def setup_method(self):
+        self.config = AmazonConverseConfig()
+
+    @pytest.mark.parametrize("tool_choice", ["required", "any"])
+    def test_required_and_any_both_map_to_bedrock_any(self, tool_choice):
+        result = self.config.map_tool_choice_values(model=MODEL, tool_choice=tool_choice, drop_params=False)
+
+        assert result == {"any": {}}
+
+    def test_auto_is_unchanged(self):
+        result = self.config.map_tool_choice_values(model=MODEL, tool_choice="auto", drop_params=False)
+
+        assert result == {"auto": {}}
+
+    def test_specific_tool_is_unchanged(self):
+        result = self.config.map_tool_choice_values(
+            model=MODEL,
+            tool_choice={"type": "function", "function": {"name": "get_weather"}},
+            drop_params=False,
+        )
+
+        assert result == {"tool": {"name": "get_weather"}}
+
+    def test_unknown_value_still_raises_and_lists_any(self):
+        with pytest.raises(litellm.utils.UnsupportedParamsError) as exc_info:
+            self.config.map_tool_choice_values(model=MODEL, tool_choice="definitely_not_supported", drop_params=False)
+
+        # The error text is the discoverability surface for these values.
+        assert "'any'" in str(exc_info.value)
+
+    def test_none_still_drops_when_drop_params_is_set(self):
+        assert self.config.map_tool_choice_values(model=MODEL, tool_choice="none", drop_params=True) is None