eugene/allow passing as is on cast fail

[eyurtsev]

Fix for when cast fails.

This will keep the value as a string, and allow downstream code to create an error message to feed back into the llm, so the llm can correct its response.

ValueError("invalid literal for int() with base 10: '${get_current_user_id()}'")Traceback (most recent call last):

  File "/virtualenvs/langchain-benchmarks-mH3m7l2a-py3.11/lib/python3.11/site-packages/langchain_core/runnables/base.py", line 1514, in invoke
    input = step.invoke(
            ^^^^^^^^^^^^

  File "/virtualenvs/langchain-benchmarks-mH3m7l2a-py3.11/lib/python3.11/site-packages/langchain_core/runnables/base.py", line 2631, in invoke
    return self._call_with_config(
           ^^^^^^^^^^^^^^^^^^^^^^^

  File "/virtualenvs/langchain-benchmarks-mH3m7l2a-py3.11/lib/python3.11/site-packages/langchain_core/runnables/base.py", line 886, in _call_with_config
    output = call_func_with_variable_args(
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

  File "/virtualenvs/langchain-benchmarks-mH3m7l2a-py3.11/lib/python3.11/site-packages/langchain_core/runnables/config.py", line 308, in call_func_with_variable_args
    return func(input, **kwargs)  # type: ignore[call-arg]
           ^^^^^^^^^^^^^^^^^^^^^

  File "/virtualenvs/langchain-benchmarks-mH3m7l2a-py3.11/lib/python3.11/site-packages/langchain_core/runnables/base.py", line 2549, in _invoke
    output = call_func_with_variable_args(
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

  File "/virtualenvs/langchain-benchmarks-mH3m7l2a-py3.11/lib/python3.11/site-packages/langchain_core/runnables/config.py", line 308, in call_func_with_variable_args
    return func(input, **kwargs)  # type: ignore[call-arg]
           ^^^^^^^^^^^^^^^^^^^^^

  File "/Users/wfh/code/lc/langchain-benchmarks/langchain_benchmarks/tool_usage/agents/anthropic_tool_user.py", line 206, in run_agent
    messages = run_anthropic_agent_simple(
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^

  File "/Users/wfh/code/lc/langchain-benchmarks/langchain_benchmarks/tool_usage/agents/anthropic_tool_user.py", line 120, in run_anthropic_agent_simple
    last_message = tool_user.use_tools(
                   ^^^^^^^^^^^^^^^^^^^^

  File "/Users/wfh/code/lc/langchain-benchmarks/docs/source/notebooks/tool_usage/../../../../_anthropic_tools/anthropic-tools/tool_use_package/tool_user.py", line 110, in use_tools
    parsed_function_calls = self._parse_function_calls(
                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^

  File "/Users/wfh/code/lc/langchain-benchmarks/docs/source/notebooks/tool_usage/../../../../_anthropic_tools/anthropic-tools/tool_use_package/tool_user.py", line 226, in _parse_function_calls
    converted_params[name] = ToolUser._convert_value(value, type_)
                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

  File "/Users/wfh/code/lc/langchain-benchmarks/docs/source/notebooks/tool_usage/../../../../_anthropic_tools/anthropic-tools/tool_use_package/tool_user.py", line 416, in _convert_value
    return type_class(value)
           ^^^^^^^^^^^^^^^^^

ValueError: invalid literal for int() with base 10: '${get_current_user_id()}'

[eyurtsev]

Please standby -- I will verify that this is working