feat: use json schema for tool argument serialization

- Replace Python representation with JsonSchema for tool arguments
  - Remove deprecated PydanticSchemaParser in favor of direct schema generation
  - Add handling for VAR_POSITIONAL and VAR_KEYWORD parameters
  - Improve tool argument schema collection

lib/crewai/tests/tools/test_base_tool.py

@@ -17,10 +17,11 @@ def test_creating_a_tool_using_annotation():
 
     # Assert all the right attributes were defined
     assert my_tool.name == "Name of my tool"
-    assert (
-        my_tool.description
-        == "Tool Name: Name of my tool\nTool Arguments: {'question': {'description': None, 'type': 'str'}}\nTool Description: Clear description for what this tool is useful for, your agent will need this information to use it."
-    )
+    assert "Tool Name: Name of my tool" in my_tool.description
+    assert "Tool Arguments:" in my_tool.description
+    assert '"question"' in my_tool.description
+    assert '"type": "string"' in my_tool.description
+    assert "Tool Description: Clear description for what this tool is useful for" in my_tool.description
     assert my_tool.args_schema.model_json_schema()["properties"] == {
         "question": {"title": "Question", "type": "string"}
     }
@@ -31,10 +32,9 @@ def test_creating_a_tool_using_annotation():
     converted_tool = my_tool.to_structured_tool()
     assert converted_tool.name == "Name of my tool"
 
-    assert (
-        converted_tool.description
-        == "Tool Name: Name of my tool\nTool Arguments: {'question': {'description': None, 'type': 'str'}}\nTool Description: Clear description for what this tool is useful for, your agent will need this information to use it."
-    )
+    assert "Tool Name: Name of my tool" in converted_tool.description
+    assert "Tool Arguments:" in converted_tool.description
+    assert '"question"' in converted_tool.description
     assert converted_tool.args_schema.model_json_schema()["properties"] == {
         "question": {"title": "Question", "type": "string"}
     }
@@ -56,10 +56,11 @@ def test_creating_a_tool_using_baseclass():
     # Assert all the right attributes were defined
     assert my_tool.name == "Name of my tool"
 
-    assert (
-        my_tool.description
-        == "Tool Name: Name of my tool\nTool Arguments: {'question': {'description': None, 'type': 'str'}}\nTool Description: Clear description for what this tool is useful for, your agent will need this information to use it."
-    )
+    assert "Tool Name: Name of my tool" in my_tool.description
+    assert "Tool Arguments:" in my_tool.description
+    assert '"question"' in my_tool.description
+    assert '"type": "string"' in my_tool.description
+    assert "Tool Description: Clear description for what this tool is useful for" in my_tool.description
     assert my_tool.args_schema.model_json_schema()["properties"] == {
         "question": {"title": "Question", "type": "string"}
     }
@@ -68,10 +69,9 @@ def test_creating_a_tool_using_baseclass():
     converted_tool = my_tool.to_structured_tool()
     assert converted_tool.name == "Name of my tool"
 
-    assert (
-        converted_tool.description
-        == "Tool Name: Name of my tool\nTool Arguments: {'question': {'description': None, 'type': 'str'}}\nTool Description: Clear description for what this tool is useful for, your agent will need this information to use it."
-    )
+    assert "Tool Name: Name of my tool" in converted_tool.description
+    assert "Tool Arguments:" in converted_tool.description
+    assert '"question"' in converted_tool.description
     assert converted_tool.args_schema.model_json_schema()["properties"] == {
         "question": {"title": "Question", "type": "string"}
     }

lib/crewai/tests/tools/test_tool_usage.py

@@ -107,25 +107,20 @@ def test_tool_usage_render():
 
     rendered = tool_usage._render()
 
-    # Updated checks to match the actual output
+    # Check that the rendered output contains the expected tool information
     assert "Tool Name: Random Number Generator" in rendered
     assert "Tool Arguments:" in rendered
-    assert (
-        "'min_value': {'description': 'The minimum value of the range (inclusive)', 'type': 'int'}"
-        in rendered
-    )
-    assert (
-        "'max_value': {'description': 'The maximum value of the range (inclusive)', 'type': 'int'}"
-        in rendered
-    )
     assert (
         "Tool Description: Generates a random number within a specified range"
         in rendered
     )
-    assert (
-        "Tool Name: Random Number Generator\nTool Arguments: {'min_value': {'description': 'The minimum value of the range (inclusive)', 'type': 'int'}, 'max_value': {'description': 'The maximum value of the range (inclusive)', 'type': 'int'}}\nTool Description: Generates a random number within a specified range"
-        in rendered
-    )
+
+    # Check that the JSON schema format is used (proper JSON schema types)
+    assert '"min_value"' in rendered
+    assert '"max_value"' in rendered
+    assert '"type": "integer"' in rendered
+    assert '"description": "The minimum value of the range (inclusive)"' in rendered
+    assert '"description": "The maximum value of the range (inclusive)"' in rendered
 
 
 def test_validate_tool_input_booleans_and_none():