Function isContextOverflowStatusError

packages/kosong/src/errors.ts:167–171

(statusCode: number, message: string)

}

export function isContextOverflowStatusError(statusCode: number, message: string): boolean {
  if (statusCode !== 400 && statusCode !== 413 && statusCode !== 422) return false;
  const lowerMessage = message.toLowerCase();
  return CONTEXT_OVERFLOW_MESSAGE_PATTERNS.some((pattern) => pattern.test(lowerMessage));
}

// Strict providers reject a request whose assistant `tool_use`/`tool_calls` and
// `tool_result`/`tool` blocks are not correctly paired and adjacent — a missing