Function parseOpenRouterError

web/src/llm-api/openrouter.ts:873–916

* Parses an error response from OpenRouter and returns an OpenRouterError.

(
  response: Response,
)

 * Parses an error response from OpenRouter and returns an OpenRouterError.
 */
async function parseOpenRouterError(
  response: Response,
): Promise<OpenRouterError> {
  const errorText = await response.text()
  let errorBody: OpenRouterError['errorBody']
  try {
    const parsed = JSON.parse(errorText)
    const validated = OpenRouterErrorResponseSchema.safeParse(parsed)
    if (validated.success) {
      // metadata is not in the schema but OpenRouter includes it for provider errors
      const metadata = (parsed as any).error?.metadata as
        | { raw?: string; provider_name?: string }
        | undefined
      const enhancedMessage = buildEnhancedErrorMessage(
        validated.data.error.message,
        metadata,
      )
      errorBody = {
        error: {
          message: enhancedMessage,
          code: validated.data.error.code ?? null,
          type: validated.data.error.type,
          param: validated.data.error.param,
          metadata,
        },
      }
    } else {
      errorBody = {
        error: {
          message: errorText || response.statusText,
          code: response.status,
        },
      }
    }
  } catch {
    errorBody = {
      error: {
        message: errorText || response.statusText,
        code: response.status,
      },
    }
  }
  return new OpenRouterError(response.status, response.statusText, errorBody)
}

/**
 * Convert credits (integer cents) back to a cost value that will result in the same