Method selectModel

src/model/adaptive_router.js:68–103

* Select the best model given current failure rates. * Returns the strong or medium model if the primary has poor reliability. * * Thresholds: * > 0.6 failure rate → use SMALLCODE_MODEL_STRONG (if set) * > 0.3 failure rate → use SMALLCODE_MODEL_MEDIUM (if set) * otherwise

(config)

   * @returns {{ model: string, url: string }}
   */
  selectModel(config) {
    const primaryModel = config?.model?.name || '';
    const primaryUrl = config?.model?.baseUrl || '';

    if (!primaryModel) return { model: primaryModel, url: primaryUrl };

    const entry = this.failureRates.get(primaryModel);
    // Not enough data yet — use primary
    if (!entry || entry.calls < 3) return { model: primaryModel, url: primaryUrl };

    const rate = entry.fails / entry.calls;

    if (rate > 0.6) {
      const strong = config?.models?.strong?.name || process.env.SMALLCODE_MODEL_STRONG;
      if (strong && strong !== primaryModel) {
        return {
          model: strong,
          url: config?.models?.strong?.baseUrl || process.env.SMALLCODE_BASE_URL_STRONG || primaryUrl,
          tier: 'strong',
        };
      }
    }

    if (rate > 0.3) {
      const medium = config?.models?.medium?.name || process.env.SMALLCODE_MODEL_MEDIUM;
      if (medium && medium !== primaryModel) {
        return {
          model: medium,
          url: config?.models?.medium?.baseUrl || process.env.SMALLCODE_BASE_URL_MEDIUM || primaryUrl,
          tier: 'medium',
        };
      }
    }

    return { model: primaryModel, url: primaryUrl };
  }

  /**
   * Reset all tracked failure rates (called on new agent session or test runs).