Feat/remove langchain (#1654)

* feat: add initial changes from langchain

* feat: remove kwargs of being processed

* feat: remove langchain, update uv.lock and fix type_hint

* feat: change docs

* feat: remove forced requirements for parameter

* feat add tests for new structure tool

* feat: fix tests and adapt code for args

tests/tools/test_base_tool.py

@@ -1,4 +1,5 @@
 from typing import Callable
+
 from crewai.tools import BaseTool, tool
 
 
@@ -21,8 +22,7 @@ def test_creating_a_tool_using_annotation():
         my_tool.func("What is the meaning of life?") == "What is the meaning of life?"
     )
 
-    # Assert the langchain tool conversion worked as expected
-    converted_tool = my_tool.to_langchain()
+    converted_tool = my_tool.to_structured_tool()
     assert converted_tool.name == "Name of my tool"
 
     assert (
@@ -41,9 +41,7 @@ def test_creating_a_tool_using_annotation():
 def test_creating_a_tool_using_baseclass():
     class MyCustomTool(BaseTool):
         name: str = "Name of my tool"
-        description: str = (
-            "Clear description for what this tool is useful for, you agent will need this information to use it."
-        )
+        description: str = "Clear description for what this tool is useful for, you agent will need this information to use it."
 
         def _run(self, question: str) -> str:
             return question
@@ -61,8 +59,7 @@ def test_creating_a_tool_using_baseclass():
     }
     assert my_tool.run("What is the meaning of life?") == "What is the meaning of life?"
 
-    # Assert the langchain tool conversion worked as expected
-    converted_tool = my_tool.to_langchain()
+    converted_tool = my_tool.to_structured_tool()
     assert converted_tool.name == "Name of my tool"
 
     assert (
@@ -73,7 +70,7 @@ def test_creating_a_tool_using_baseclass():
         "question": {"title": "Question", "type": "string"}
     }
     assert (
-        converted_tool.run("What is the meaning of life?")
+        converted_tool._run("What is the meaning of life?")
         == "What is the meaning of life?"
     )
 
@@ -81,9 +78,7 @@ def test_creating_a_tool_using_baseclass():
 def test_setting_cache_function():
     class MyCustomTool(BaseTool):
         name: str = "Name of my tool"
-        description: str = (
-            "Clear description for what this tool is useful for, you agent will need this information to use it."
-        )
+        description: str = "Clear description for what this tool is useful for, you agent will need this information to use it."
         cache_function: Callable = lambda: False
 
         def _run(self, question: str) -> str:
@@ -97,9 +92,7 @@ def test_setting_cache_function():
 def test_default_cache_function_is_true():
     class MyCustomTool(BaseTool):
         name: str = "Name of my tool"
-        description: str = (
-            "Clear description for what this tool is useful for, you agent will need this information to use it."
-        )
+        description: str = "Clear description for what this tool is useful for, you agent will need this information to use it."
 
         def _run(self, question: str) -> str:
             return question

tests/tools/test_structured_tool.py

@@ -0,0 +1,146 @@
+from typing import Optional
+
+import pytest
+from pydantic import BaseModel, Field
+
+from crewai.tools.structured_tool import CrewStructuredTool
+
+
+# Test fixtures
+@pytest.fixture
+def basic_function():
+    def test_func(param1: str, param2: int = 0) -> str:
+        """Test function with basic params."""
+        return f"{param1} {param2}"
+
+    return test_func
+
+
+@pytest.fixture
+def schema_class():
+    class TestSchema(BaseModel):
+        param1: str
+        param2: int = Field(default=0)
+
+    return TestSchema
+
+
+class TestCrewStructuredTool:
+    def test_initialization(self, basic_function, schema_class):
+        """Test basic initialization of CrewStructuredTool"""
+        tool = CrewStructuredTool(
+            name="test_tool",
+            description="Test tool description",
+            func=basic_function,
+            args_schema=schema_class,
+        )
+
+        assert tool.name == "test_tool"
+        assert tool.description == "Test tool description"
+        assert tool.func == basic_function
+        assert tool.args_schema == schema_class
+
+    def test_from_function(self, basic_function):
+        """Test creating tool from function"""
+        tool = CrewStructuredTool.from_function(
+            func=basic_function, name="test_tool", description="Test description"
+        )
+
+        assert tool.name == "test_tool"
+        assert tool.description == "Test description"
+        assert tool.func == basic_function
+        assert isinstance(tool.args_schema, type(BaseModel))
+
+    def test_validate_function_signature(self, basic_function, schema_class):
+        """Test function signature validation"""
+        tool = CrewStructuredTool(
+            name="test_tool",
+            description="Test tool",
+            func=basic_function,
+            args_schema=schema_class,
+        )
+
+        # Should not raise any exceptions
+        tool._validate_function_signature()
+
+    @pytest.mark.asyncio
+    async def test_ainvoke(self, basic_function):
+        """Test asynchronous invocation"""
+        tool = CrewStructuredTool.from_function(func=basic_function, name="test_tool")
+
+        result = await tool.ainvoke(input={"param1": "test"})
+        assert result == "test 0"
+
+    def test_parse_args_dict(self, basic_function):
+        """Test parsing dictionary arguments"""
+        tool = CrewStructuredTool.from_function(func=basic_function, name="test_tool")
+
+        parsed = tool._parse_args({"param1": "test", "param2": 42})
+        assert parsed["param1"] == "test"
+        assert parsed["param2"] == 42
+
+    def test_parse_args_string(self, basic_function):
+        """Test parsing string arguments"""
+        tool = CrewStructuredTool.from_function(func=basic_function, name="test_tool")
+
+        parsed = tool._parse_args('{"param1": "test", "param2": 42}')
+        assert parsed["param1"] == "test"
+        assert parsed["param2"] == 42
+
+    def test_complex_types(self):
+        """Test handling of complex parameter types"""
+
+        def complex_func(nested: dict, items: list) -> str:
+            """Process complex types."""
+            return f"Processed {len(items)} items with {len(nested)} nested keys"
+
+        tool = CrewStructuredTool.from_function(
+            func=complex_func, name="test_tool", description="Test complex types"
+        )
+        result = tool.invoke({"nested": {"key": "value"}, "items": [1, 2, 3]})
+        assert result == "Processed 3 items with 1 nested keys"
+
+    def test_schema_inheritance(self):
+        """Test tool creation with inherited schema"""
+
+        def extended_func(base_param: str, extra_param: int) -> str:
+            """Test function with inherited schema."""
+            return f"{base_param} {extra_param}"
+
+        class BaseSchema(BaseModel):
+            base_param: str
+
+        class ExtendedSchema(BaseSchema):
+            extra_param: int
+
+        tool = CrewStructuredTool.from_function(
+            func=extended_func, name="test_tool", args_schema=ExtendedSchema
+        )
+
+        result = tool.invoke({"base_param": "test", "extra_param": 42})
+        assert result == "test 42"
+
+    def test_default_values_in_schema(self):
+        """Test handling of default values in schema"""
+
+        def default_func(
+            required_param: str,
+            optional_param: str = "default",
+            nullable_param: Optional[int] = None,
+        ) -> str:
+            """Test function with default values."""
+            return f"{required_param} {optional_param} {nullable_param}"
+
+        tool = CrewStructuredTool.from_function(
+            func=default_func, name="test_tool", description="Test defaults"
+        )
+
+        # Test with minimal parameters
+        result = tool.invoke({"required_param": "test"})
+        assert result == "test default None"
+
+        # Test with all parameters
+        result = tool.invoke(
+            {"required_param": "test", "optional_param": "custom", "nullable_param": 42}
+        )
+        assert result == "test custom 42"