Function withTextToolProtocol

src/llm/text-tool-protocol.ts:103–110

(messages: Message[], block: string)

 * No-op (returns the same array reference semantics, new array) when `block` is empty.
 */
export function withTextToolProtocol(messages: Message[], block: string): Message[] {
  if (!block) return messages;
  // Find the index just past the leading run of system messages.
  let insertAt = 0;
  while (insertAt < messages.length && messages[insertAt]!.role === 'system') insertAt++;
  const protocolMsg: Message = { role: 'system', content: block };
  return [...messages.slice(0, insertAt), protocolMsg, ...messages.slice(insertAt)];
}