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TypeScript
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223import { Option, Schema } from "effect"import { AuthenticationError, ContentPolicyError, InvalidRequestError, AIError, ProviderErrorEvent, ProviderInternalError, QuotaExceededError, RateLimitError, UnknownProviderError, type HttpContext, type HttpRateLimitDetails,} from "./schema/index.js"
const patterns = [ /prompt is too long/i, /input is too long for requested model/i, /exceeds the context window/i, /exceeds (?:the )?(?:model'?s )?maximum context length(?: of [\d,]+ tokens?|\s*\([\d,]+\))/i, /input token count.*exceeds the maximum/i, /tokens in request more than max tokens allowed/i, /maximum prompt length is \d+/i, /reduce the length of the messages/i, /maximum context length is \d+ tokens/i, /exceeds (?:the )?maximum allowed input length of [\d,]+ tokens?/i, /input \(\d+ tokens\) is longer than the model'?s context length \(\d+ tokens\)/i, /exceeds the limit of \d+/i, /exceeds the available context size/i, /greater than the context length/i, /context window exceeds limit/i, /exceeded model token limit/i, /context[_ ]length[_ ]exceeded/i, /context length is only \d+ tokens/i, /input length.*exceeds.*context length/i, /prompt too long; exceeded (?:max )?context length/i, /too large for model with \d+ maximum context length/i, /prompt has [\d,]+ tokens?, but the configured context size is [\d,]+ tokens?/i, /model_context_window_exceeded/i, /range of input length should be/i, /too many tokens/i, /token limit exceeded/i, /request_too_large/i,]
const payloadPatterns = [/request entity too large/i, /payload too large/i, /request too large/i]
const exclusions = [/^(throttling error|service unavailable):/i, /rate limit/i, /too many requests/i]
export const isContextOverflow = (message: string) => !exclusions.some((pattern) => pattern.test(message)) && (patterns.some((pattern) => pattern.test(message)) || /^4(?:00|13)\s*(status code)?\s*\(no body\)/i.test(message))
export const isPayloadTooLarge = (message: string) => payloadPatterns.some((pattern) => pattern.test(message))
export const isContextOverflowFailure = (failure: unknown) => failure instanceof AIError ? failure.reason._tag === "InvalidRequest" && failure.reason.classification === "context-overflow" : Schema.is(ProviderErrorEvent)(failure) && failure.classification === "context-overflow"
const decodeJson = Schema.decodeUnknownOption(Schema.fromJsonString(Schema.Unknown))// OpenCode Zen reports account caps as typed 429/402 errors that are not throttles.const QUOTA_CODES = new Set([ "insufficient_quota", "usage_not_included", "billing_error", "gousagelimiterror", "freeusagelimiterror", "creditlimitexceeded",])const AUTH_CODES = new Set(["authentication_error", "permission_error"])const SERVER_CODES = new Set([ "api_error", "internal_error", "internalserverexception", "modelstreamerrorexception", "overloaded_error", "server_error", "server_is_overloaded", "slow_down", "serviceunavailableexception",])const INVALID_REQUEST_CODES = new Set(["invalid_prompt", "invalid_request_error", "validationexception"])// Azure OpenAI reports `content_filter` with `innererror.code` ResponsibleAIPolicyViolation.// OpenRouter tags provider failures with a typed `error_type`; its Responses skin also// emits `image_content_policy_violation` as the native code.const CONTENT_POLICY_CODES = new Set([ "content_filter", "responsibleaipolicyviolation", "content_policy_violation", "image_content_policy_violation", "refusal",])// OpenCode Zen replaces upstream codes outside its allow-list but keeps the original// as a `[code]` label at the start of the rewritten message.const GATEWAY_CODE_LABEL = /^[^:\n]+: \[([A-Za-z0-9_.-]+)\]/const RATE_LIMIT_TEXT = /rate increased too quickly|rate[-_\s]?limit|too[_\s]?many[_\s]?requests/i// Only consulted on 429, where throttles and account caps share a status.const QUOTA_TEXT = /insufficient[-_\s]?quota|quota[-_\s]?exceeded|budget exceeded|usage limit/i// Policy rejections without a dedicated code, matched against the provider's own// explanation only. OpenAI reuses `invalid_prompt` for usage-policy rejections while// Bedrock Mantle reuses it for schema validation; Anthropic reports blocked output// under `invalid_request_error`.const CONTENT_POLICY_TEXT = /violating our usage policy|blocked by content filtering policy|content[-_\s]?policy|rejected as a result of our safety system/iconst SERVER_ERROR_TEXT = /\b(?:try again|(?:please |you can )?retry (?:the |this |your )?request|try (?:the |this |your )?request again|(?:currently |temporarily )?at capacity|overloaded|temporarily unavailable|service[-_\s]?unavailable|(?:server|internal)[-_\s]?error|server (?:is )?busy|provider returned (?:an )?error|resource[-_\s]?exhausted|upstream (?:connect|connection|request)|request buffer limit while retrying upstream)\b/i
export interface ProviderFailure { readonly message: string readonly status?: number | undefined // Raw wire payload, scanned for failure signals (codes, overflow phrases) // that the summary message does not carry. Not shown to users. readonly rawBody?: string | undefined // Some SDKs supply parsed error data separately from the original response text. readonly data?: unknown readonly http?: HttpContext | undefined readonly cause?: unknown readonly retryAfterMs?: number | undefined readonly rateLimit?: HttpRateLimitDetails | undefined}
// Classification records affirmative evidence about a failure. Deterministic// failures need positive identification (a 4xx status, quota/auth/policy// signals); anything unrecognized stays UnknownProvider, which the session// retry policy treats as retry-eligible because transient failures arrive in// unpredictable shapes while deterministic rejections almost always carry a// status or known code.export function classifyProviderFailure(input: ProviderFailure): AIError["reason"] { const details = { message: input.message, body: input.rawBody, http: input.http, cause: input.cause } const body = input.rawBody ?? "" const codes = [ ...providerCodes(input.data), ...providerCodes(body), ...providerCodes(input.message), ...(GATEWAY_CODE_LABEL.exec(input.message)?.slice(1) ?? []), ].map((code) => code.toLowerCase()) // Scan the raw payload too so signals missing from the summary message // (e.g. overflow phrases nested in a JSON error body) still classify. const text = [input.message, body].filter((value) => value.length > 0).join("\n") const clientScoped = input.status === undefined || (input.status >= 400 && input.status < 500)
if ( clientScoped && (codes.includes("context_length_exceeded") || codes.includes("model_context_window_exceeded") || codes.includes("request_too_large") || isContextOverflow(text)) ) return new InvalidRequestError({ ...details, classification: "context-overflow" }) if (input.status === 413 || isPayloadTooLarge(text)) return new InvalidRequestError({ ...details, classification: "payload-too-large" }) if (codes.some((code) => CONTENT_POLICY_CODES.has(code)) || (clientScoped && CONTENT_POLICY_TEXT.test(input.message))) return new ContentPolicyError(details) if ( input.status === 402 || codes.some((code) => QUOTA_CODES.has(code)) || (input.status === 429 && QUOTA_TEXT.test(text)) ) return new QuotaExceededError(details) if (input.status === 401 || input.status === 403 || codes.some((code) => AUTH_CODES.has(code))) return new AuthenticationError(details) if ( input.status === 429 || codes.some( (code) => code.includes("rate_limit") || code === "too_many_requests" || code === "throttlingexception", ) || RATE_LIMIT_TEXT.test(text) ) return new RateLimitError({ ...details, retryAfterMs: input.retryAfterMs, rateLimit: input.rateLimit, }) if ( input.status === 408 || input.status === 409 || (input.status !== undefined && input.status >= 500) || // Server codes and phrasing only decide when no HTTP status contradicts them: // gateways such as OpenCode Zen substitute `server_error` for codes they do // not forward, so a 4xx with a server code is still a rejected request. ((input.status === undefined || input.status < 400) && ((!codes.some((code) => INVALID_REQUEST_CODES.has(code)) && SERVER_ERROR_TEXT.test(text)) || codes.some((code) => SERVER_CODES.has(code) || code.includes("exhausted") || code.includes("unavailable")))) ) return new ProviderInternalError({ ...details, retryAfterMs: input.retryAfterMs, }) if (codes.some((code) => INVALID_REQUEST_CODES.has(code))) return new InvalidRequestError(details) // Any remaining 4xx is a deterministic rejection of this request. if (input.status !== undefined && input.status >= 400 && input.status < 500) return new InvalidRequestError(details) return new UnknownProviderError(details)}
function providerCodes(value: unknown) { const decoded = typeof value === "string" ? Option.getOrUndefined(decodeJson(value)) : value if (!isRecord(decoded)) return [] const error = isRecord(decoded.error) ? decoded.error : undefined const inner = error && isRecord(error.innererror) ? error.innererror : undefined const metadata = error && isRecord(error.metadata) ? error.metadata : undefined const response = isRecord(decoded.response) ? decoded.response : undefined const responseError = response && isRecord(response.error) ? response.error : undefined const exception = isRecord(decoded.exception) ? decoded.exception : undefined return [ decoded.code, decoded.error_type, error?.code, error?.type, error?.status, error?.error_type, inner?.code, metadata?.error_type, responseError?.code, response?.error_type, exception?.type, ].filter((value): value is string => typeof value === "string")}
function isRecord(value: unknown): value is Record<string, unknown> { return typeof value === "object" && value !== null}