Interface FormattedProviderError

Structured form of a provider error string. Provider errors look something like <httpStatus> <jsonBody> (Anthropic, OpenAI) or <jsonBody> (Gemini). This helper makes a best-effort guess: walk the JSON, grab the deepest message string and the first 3-digit code/status field.

interface FormattedProviderError {
    details?: string;
    message: string;
    raw: string;
    status?: string;
}