[BUG] native tool calls crash when arguments JSON is not an object

Description

parse_tool_call_args JSON-decodes string arguments and returns whatever type json.loads produced. A JSON array, string, or number is not a mapping, so later fn(**args) raises TypeError. Bedrock streaming already coerces non-dict JSON to a dict. Native tool calls do not.

Steps to Reproduce

from crewai.utilities.agent_utils import parse_tool_call_args

args, error = parse_tool_call_args('["oops"]', "get_weather", "call_1")
print(args, error)
# later: fn(**args)

Expected behavior

Non-object JSON is treated as invalid input and returns an error result, not a list.

Screenshots/Code snippets

TypeError: dict argument ... when expanding a list into keyword arguments.

Operating System

Windows 11

Python Version

3.12

crewAI Version

main

Additional context

Native tool execution in agent_utils uses the parsed value as kwargs.

Start in crewai/utilities/agent_utils.py at parse_tool_call_args and compare its handling with the Bedrock streaming coercion described in the issue. Reproduce the array-argument case, then verify that non-object JSON produces an error result rather than a value later passed as keyword arguments.