Function convertToResponsesApiInput

web/src/app/api/v1/token-count/_post.ts:181–233

(
  messages: TokenCountRequest['messages'],
)

  | { type: 'function_call_output'; call_id: string; output: string }

export function convertToResponsesApiInput(
  messages: TokenCountRequest['messages'],
): ResponsesApiInputItem[] {
  const input: ResponsesApiInputItem[] = []

  for (const message of messages) {
    if (message.role === 'system') {
      const content = buildMessageContent(message.content)
      if (content) {
        input.push({ type: 'message', role: 'developer', content })
      }
      continue
    }

    if (message.role === 'tool') {
      input.push({
        type: 'function_call_output',
        call_id: message.toolCallId ?? 'unknown',
        output: formatToolContent(message.content),
      })
      continue
    }

    if (message.role === 'user') {
      const content = buildMessageContent(message.content)
      if (content) {
        input.push({ type: 'message', role: 'user', content })
      }
      continue
    }

    if (message.role === 'assistant') {
      const content = buildMessageContent(message.content)
      if (content) {
        input.push({ type: 'message', role: 'assistant', content })
      }
      if (Array.isArray(message.content)) {
        for (const part of message.content) {
          if (part.type === 'tool-call') {
            input.push({
              type: 'function_call',
              id: part.toolCallId ?? 'unknown',
              name: part.toolName,
              arguments: JSON.stringify(part.input ?? {}),
            })
          }
        }
      }
    }
  }

  return input
}

function buildMessageContent(
  content: unknown,