Function hasKnownLoopSignature

src/proxy.ts:727–749

(text: string)

}

function hasKnownLoopSignature(text: string): boolean {
  const matchCount = DEGRADED_LOOP_PATTERNS.reduce(
    (count, pattern) => (pattern.test(text) ? count + 1 : count),
    0,
  );
  if (matchCount >= 2) return true;

  // Generic repetitive loop fallback for short repeated lines.
  const lines = text
    .split(/\r?\n/)
    .map((line) => line.trim())
    .filter(Boolean);
  if (lines.length < 8) return false;

  const counts = new Map<string, number>();
  for (const line of lines) {
    counts.set(line, (counts.get(line) ?? 0) + 1);
  }

  const maxRepeat = Math.max(...counts.values());
  const uniqueRatio = counts.size / lines.length;
  return maxRepeat >= 3 && uniqueRatio <= 0.45;
}

/**
 * Detect degraded 200-response payloads that should trigger model fallback.