_parse_arguments_from_tool_call() — langchain Function Reference

Architecture documentation for the _parse_arguments_from_tool_call() function in chat_models.py from the langchain codebase.

Function python LangChainCore LanguageModelBase calls 1 called by 1

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LangChainCore→ LanguageModelBase→ _parse_arguments_from_tool_call() — langchain Function Reference

Dependency Diagram

graph TD
  ef2fbbf4_d176_ecab_7ad5_9a91394db4ee["_parse_arguments_from_tool_call()"]
  5b41b5a0_b415_2ecd_9522_191ca69202ca["chat_models.py"]
  ef2fbbf4_d176_ecab_7ad5_9a91394db4ee -->|defined in| 5b41b5a0_b415_2ecd_9522_191ca69202ca
  22b4b72b_4c0e_fde2_2401_52040de102e0["_get_tool_calls_from_response()"]
  22b4b72b_4c0e_fde2_2401_52040de102e0 -->|calls| ef2fbbf4_d176_ecab_7ad5_9a91394db4ee
  e6c4a9df_6037_7280_75cd_a57b75d96dfe["_parse_json_string()"]
  ef2fbbf4_d176_ecab_7ad5_9a91394db4ee -->|calls| e6c4a9df_6037_7280_75cd_a57b75d96dfe
  style ef2fbbf4_d176_ecab_7ad5_9a91394db4ee fill:#6366f1,stroke:#818cf8,color:#fff

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Source Code

libs/partners/ollama/langchain_ollama/chat_models.py lines 170–204

def _parse_arguments_from_tool_call(
    raw_tool_call: dict[str, Any],
) -> dict[str, Any] | None:
    """Parse arguments by trying to parse any shallowly nested string-encoded JSON.

    Band-aid fix for issue in Ollama with inconsistent tool call argument structure.
    Should be removed/changed if fixed upstream.

    See https://github.com/ollama/ollama/issues/6155
    """
    if "function" not in raw_tool_call:
        return None
    function_name = raw_tool_call["function"]["name"]
    arguments = raw_tool_call["function"]["arguments"]
    parsed_arguments: dict = {}
    if isinstance(arguments, dict):
        for key, value in arguments.items():
            # Filter out metadata fields like 'functionName' that echo function name
            if key == "functionName" and value == function_name:
                continue
            if isinstance(value, str):
                parsed_value = _parse_json_string(
                    value, skip=True, raw_tool_call=raw_tool_call
                )
                if isinstance(parsed_value, (dict, list)):
                    parsed_arguments[key] = parsed_value
                else:
                    parsed_arguments[key] = value
            else:
                parsed_arguments[key] = value
    else:
        parsed_arguments = _parse_json_string(
            arguments, skip=False, raw_tool_call=raw_tool_call
        )
    return parsed_arguments