LibreChat/packages/api/src/utils/content.ts

import { ContentTypes } from 'librechat-data-provider';
import type { TMessageContentParts } from 'librechat-data-provider';

/**
 * Filters out malformed tool call content parts that don't have the required tool_call property.
 * This handles edge cases where tool_call content parts may be created with only a type property
 * but missing the actual tool_call data.
 *
 * @param contentParts - Array of content parts to filter
 * @returns Filtered array with malformed tool calls removed
 *
 * @example
 * // Removes malformed tool_call without the tool_call property
 * const parts = [
 *   { type: 'tool_call', tool_call: { id: '123', name: 'test' } }, // valid - kept
 *   { type: 'tool_call' }, // invalid - filtered out
 *   { type: 'text', text: 'Hello' }, // valid - kept (other types pass through)
 * ];
 * const filtered = filterMalformedContentParts(parts);
 * // Returns all parts except the malformed tool_call
 */
export function filterMalformedContentParts(
  contentParts: TMessageContentParts[],
): TMessageContentParts[];
export function filterMalformedContentParts<T>(contentParts: T): T;
export function filterMalformedContentParts<T>(
  contentParts: T | TMessageContentParts[],
): T | TMessageContentParts[] {
  if (!Array.isArray(contentParts)) {
    return contentParts;
  }

  return contentParts.filter((part) => {
    if (!part || typeof part !== 'object') {
      return false;
    }

    const { type } = part;

    if (type === ContentTypes.TOOL_CALL) {
      return 'tool_call' in part && part.tool_call != null && typeof part.tool_call === 'object';
    }

    return true;
  });
}