/**
 * Codex-outbound fallback: request translation, Codex Responses -> ClaudeRequest.
 *
 * Named to mirror the existing asymmetry: `codexFallback.ts` is the Claude
 * engine's fallback _into_ Codex; this file is the Codex engine's fallback
 * _out_ to the Anthropic OAuth pool or Vertex-Claude. Owns one thing:
 * untrusted inbound Codex Responses JSON -> a typed `ClaudeRequest`. Does not
 * own target/model selection, response/stream translation back to Codex wire
 * format, tool execution, or dispatch/HTTP.
 *
 * `parallel_tool_calls` feeds `tool_choice.disable_parallel_tool_use` in
 * `mapCodexToolChoiceToClaude`, and tool declarations are flattened through
 * `inlineJsonSchema` (dropping `strict` and degrading a circular `$ref` to a
 * bare `{type:"object"}`) — the tool-call-fidelity PR's changes to this file.
 * A `toolKindByName` map is also returned alongside the translated request,
 * so response serialization (which sees only Claude's `name`+`input` on a
 * `tool_use` block, no kind discriminator) knows which declared tools were
 * `custom` rather than `function`.
 */
import type { ClaudeRequest, ClaudeTextBlock } from "../types/index.js";
import type { CodexNativeInputItem, CodexNativeRequest, CodexNativeToolKind, CodexOutboundFailureInput, CodexOutboundFallbackDecision, CodexTranslationError } from "../types/index.js";
export declare function parseCodexNativeRequest(raw: unknown): {
    ok: true;
    value: CodexNativeRequest;
} | {
    ok: false;
    error: CodexTranslationError;
};
export declare function buildSystemBlocksFromDeveloperMessages(items: readonly CodexNativeInputItem[]): ClaudeTextBlock[];
export declare function translateCodexRequestToClaude(request: CodexNativeRequest, target: {
    provider: "anthropic" | "vertex";
    model: string;
}): {
    ok: true;
    value: ClaudeRequest;
    toolKindByName: ReadonlyMap<string, CodexNativeToolKind>;
} | {
    ok: false;
    error: CodexTranslationError;
};
/** Caps how many times one request may cross between engines (Codex->Anthropic
 *  or Anthropic->Codex) in a single turn. A crossing is an engine change, never
 *  a same-engine account rotation, so this bounds `Codex -> Anthropic ->
 *  Codex -> ...` cycles without limiting ordinary in-pool retries. */
export declare const MAX_ENGINE_CROSSINGS = 1;
/** Read a transport error code the same way `codexProxyRoutes.ts`'s own
 *  (unexported) `getCodexTransportErrorCode` does: a direct `.code`, falling
 *  back to `.cause.code`. Kept here, independently, as a pure utility the
 *  trigger-policy classifier can be exercised against without importing a
 *  route-handler module. */
export declare function parseCodexErrorCode(error: unknown): string | undefined;
/**
 * Classify one `codexProxyRoutes.ts` `dispatch()` failure into an
 * outbound-fallback eligibility decision. A total function over
 * `CodexOutboundFailureClass` (exhaustive switch, no `default:`): a missing
 * case fails to compile under `noImplicitReturns`, never falls through to a
 * silent `undefined`.
 *
 * `context_preflight` / `token_budget` errors are never modeled here: both
 * are self-contained terminal returns inside `dispatch()`'s own outer `try`,
 * before any of the four insertion points this classifier serves, so they
 * never reach it.
 */
export declare function classifyCodexOutboundFailure(input: CodexOutboundFailureInput): CodexOutboundFallbackDecision;