import type { CapabilityStatus, ModelArchitecture, ModelCapabilityMetadata, ModelSelectionSignals } from "./model.js";
import { type ModelReasoningCapabilities } from "./reasoning.js";
export type CodexCompatibilityStatus = "compatible" | "incompatible" | "unknown";
export type CodexCompatibility = {
    status: CodexCompatibilityStatus;
    reason?: string;
};
export type CodexBillingScope = "metered-api" | "subscription" | "upstream-managed";
export type CodexModelCandidate = ModelSelectionSignals & {
    id: string;
    nativeId?: string;
    provider?: string;
    billingScope?: CodexBillingScope;
    architecture?: ModelArchitecture;
    supportedParameters?: readonly string[];
    capabilities?: Readonly<Record<string, CapabilityStatus>>;
    reasoning?: Pick<ModelReasoningCapabilities, "status">;
};
export type CodexStartupSelection = {
    model: string;
    compatibleModelIds: readonly string[];
};
export declare function codexCompatibility(model: CodexModelCandidate): CodexCompatibility;
/**
 * Select an already-enriched Codex startup model.
 *
 * Explicit selection remains exact and validates only catalog membership, as
 * before. Implicit selection is fail-closed and billing-scope preserving.
 */
export declare function selectCodexStartupModel(input: {
    models: readonly CodexModelCandidate[];
    preferredModel?: string;
    requestedModel?: string;
}): CodexStartupSelection;
export declare function withCodexCapabilityMetadata(model: CodexModelCandidate, metadata: ModelCapabilityMetadata): CodexModelCandidate;