Function mergeToolParameters

apps/sim/tools/params.ts:778–820

(
  userProvidedParams: Record<string, unknown>,
  llmGeneratedParams: Record<string, unknown>
)

 * fields that user left empty in the UI.
 */
export function mergeToolParameters(
  userProvidedParams: Record<string, unknown>,
  llmGeneratedParams: Record<string, unknown>
): Record<string, unknown> {
  // Filter out empty and effectively-empty values from user-provided params
  // so that cleared fields don't override LLM values
  const filteredUserParams: Record<string, unknown> = {}
  for (const [key, value] of Object.entries(userProvidedParams)) {
    if (isNonEmpty(value)) {
      // Skip tag-based params if they're effectively empty (only default/unfilled entries)
      if ((key === 'documentTags' || key === 'tagFilters') && isEmptyTagValue(value)) {
        continue
      }
      filteredUserParams[key] = value
    }
  }

  // Start with LLM params as base
  const result: Record<string, unknown> = { ...llmGeneratedParams }

  // Apply user params, with special handling for inputMapping
  for (const [key, userValue] of Object.entries(filteredUserParams)) {
    if (key === 'inputMapping') {
      // Deep merge inputMapping so LLM values fill in empty user fields
      const llmInputMapping = llmGeneratedParams.inputMapping as Record<string, unknown> | undefined
      const mergedInputMapping = deepMergeInputMapping(
        llmInputMapping,
        userValue as Record<string, unknown> | string | undefined
      )
      result.inputMapping = mergedInputMapping
    } else {
      // Normal override for other params
      result[key] = userValue
    }
  }

  // If LLM provided inputMapping but user didn't, ensure it's included
  if (llmGeneratedParams.inputMapping && !filteredUserParams.inputMapping) {
    result.inputMapping = llmGeneratedParams.inputMapping
  }

  return result
}

/**
 * Filters out user-provided parameters from tool schema for LLM