Function buildResponsesInputFromMessages

apps/sim/providers/openai/utils.ts:49–96

(
  messages: Message[],
  providerId = 'openai'
)

 * Converts chat-style messages into Responses API input items.
 */
export function buildResponsesInputFromMessages(
  messages: Message[],
  providerId = 'openai'
): ResponsesInputItem[] {
  const input: ResponsesInputItem[] = []

  for (const message of messages) {
    if (message.role === 'tool' && message.tool_call_id) {
      input.push({
        type: 'function_call_output',
        call_id: message.tool_call_id,
        output: message.content ?? '',
      })
      continue
    }

    if (message.role === 'system' || message.role === 'user' || message.role === 'assistant') {
      const content =
        message.role === 'user'
          ? buildOpenAIMessageContent(message.content, message.files, providerId)
          : (message.content ?? '')
      if (
        (typeof content === 'string' && !content) ||
        (Array.isArray(content) && content.length === 0)
      ) {
        continue
      }

      input.push({
        role: message.role,
        content,
      })
    }

    if (message.tool_calls?.length) {
      for (const toolCall of message.tool_calls) {
        input.push({
          type: 'function_call',
          call_id: toolCall.id,
          name: toolCall.function.name,
          arguments: toolCall.function.arguments,
        })
      }
    }
  }

  return input
}

/**
 * Converts tool definitions to the Responses API format.