Fix issue #2383: Add invoke method to BaseTool for models without function calling support

Co-Authored-By: Joe Moura <joao@crewai.com>

tests/tools/test_invoke_method.py

@@ -0,0 +1,55 @@
+from typing import Type
+
+import pytest
+from pydantic import BaseModel, Field
+
+from crewai.tools import BaseTool
+
+
+class TestToolInput(BaseModel):
+    param: str = Field(description="A test parameter")
+
+
+class TestTool(BaseTool):
+    name: str = "Test Tool"
+    description: str = "A tool for testing the invoke method"
+    args_schema: Type[BaseModel] = TestToolInput
+
+    def _run(self, param: str) -> str:
+        return f"Tool executed with: {param}"
+
+
+def test_invoke_with_dict():
+    """Test that invoke works with a dictionary input."""
+    tool = TestTool()
+    result = tool.invoke(input={"param": "test value"})
+    assert result == "Tool executed with: test value"
+
+
+def test_invoke_with_json_string():
+    """Test that invoke works with a JSON string input."""
+    tool = TestTool()
+    result = tool.invoke(input='{"param": "test value"}')
+    assert result == "Tool executed with: test value"
+
+
+def test_invoke_with_raw_string():
+    """Test that invoke works with a raw string input."""
+    tool = TestTool()
+    result = tool.invoke(input="test value")
+    assert result == "Tool executed with: test value"
+
+
+def test_invoke_with_empty_dict():
+    """Test that invoke handles empty dict input appropriately."""
+    tool = TestTool()
+    with pytest.raises(Exception):
+        # Should raise an exception since param is required
+        tool.invoke(input={})
+
+
+def test_invoke_with_extra_args():
+    """Test that invoke filters out extra arguments not in the schema."""
+    tool = TestTool()
+    result = tool.invoke(input={"param": "test value", "extra": "ignored"})
+    assert result == "Tool executed with: test value"