Function runAgentLoop

packages/kosong/test/e2e/multi-step-agent-loop.test.ts:71–109

* Simulate a full agent loop: call step() repeatedly until there are * no more tool calls, appending assistant + tool messages to history.

(
  provider: ChatProvider,
  toolset: SimpleToolset,
  systemPrompt: string = '',
  initialHistory: Message[] = [
    { role: 'user', content: [{ type: 'text', text: 'go' }], toolCalls: [] },
  ],
)

 * no more tool calls, appending assistant + tool messages to history.
 */
async function runAgentLoop(
  provider: ChatProvider,
  toolset: SimpleToolset,
  systemPrompt: string = '',
  initialHistory: Message[] = [
    { role: 'user', content: [{ type: 'text', text: 'go' }], toolCalls: [] },
  ],
): Promise<{ messages: Message[]; turns: number }> {
  const history: Message[] = [...initialHistory];
  let turns = 0;
  const maxTurns = 10;

  while (turns < maxTurns) {
    turns++;
    const result = await step(provider, systemPrompt, toolset, history);
    history.push(result.message);

    if (result.toolCalls.length === 0) {
      break;
    }

    const toolResults = await result.toolResults();
    for (const tr of toolResults) {
      history.push({
        role: 'tool',
        content: [
          {
            type: 'text',
            text: typeof tr.returnValue.output === 'string' ? tr.returnValue.output : '',
          },
        ],
        toolCallId: tr.toolCallId,
        toolCalls: [],
      });
    }
  }

  return { messages: history, turns };
}
describe('e2e: multi-step agent loop', () => {
  it('2-step loop: tool_call → result → final text', async () => {
    const toolCall: ToolCall = {