// Decisiones simuladas, sin modelo ni efectos externos.
function run(decide, maxSteps = 3) {
  const history = [];
  for (let step = 0; step < maxSteps; step++) {
    const action = decide(history);
    if (action.name === "finish") return action.result;
    if (action.name !== "search") throw new Error("Herramienta no permitida");
    history.push({ result: "encontrada" });
  }
  throw new Error("Límite de pasos");
}
const result = run(history => history.length
  ? { name: "finish", result: history[0].result }
  : { name: "search" });
console.log("Resultado: " + result);
try {
  run(() => ({ name: "search" }));
  throw new Error("El bucle no se detuvo");
} catch (error) {
  if (error.message !== "Límite de pasos") throw error;
  console.log("Límite de pasos respetado");
}