_rm_titles() — langchain Function Reference

Source Code

libs/core/langchain_core/utils/function_calling.py lines 88–119

def _rm_titles(kv: dict, prev_key: str = "") -> dict:
    """Recursively removes `'title'` fields from a JSON schema dictionary.

    Remove `'title'` fields from the input JSON schema dictionary,
    except when a `'title'` appears within a property definition under `'properties'`.

    Args:
        kv: The input JSON schema as a dictionary.
        prev_key: The key from the parent dictionary, used to identify context.

    Returns:
        A new dictionary with appropriate `'title'` fields removed.
    """
    new_kv = {}

    for k, v in kv.items():
        if k == "title":
            # If the value is a nested dict and part of a property under "properties",
            # preserve the title but continue recursion
            if isinstance(v, dict) and prev_key == "properties":
                new_kv[k] = _rm_titles(v, k)
            else:
                # Otherwise, remove this "title" key
                continue
        elif isinstance(v, dict):
            # Recurse into nested dictionaries
            new_kv[k] = _rm_titles(v, k)
        else:
            # Leave non-dict values untouched
            new_kv[k] = v

    return new_kv