import type { AssistantMessageDiagnostic } from "../types.js";
/** Anthropic beta that re-serves safety refusals on an allowed fallback model. */
export declare const ANTHROPIC_SERVER_SIDE_FALLBACK_BETA = "server-side-fallback-2026-06-01";
export declare const CLAUDE_FABLE_5_FALLBACK_MODEL = "claude-opus-4-8";
export declare const CLAUDE_FABLE_5_FALLBACK_MODEL_COST: {
    readonly input: 5;
    readonly output: 25;
    readonly cacheRead: 0.5;
    readonly cacheWrite: 6.25;
};
export declare function buildAnthropicServerSideFallbacks(): Array<{
    model: string;
}>;
export type AnthropicFallbackBoundary = {
    fromModel: string | null;
    toModel: string | null;
};
/** Reads a `fallback` content block marking where one model's output gives way to the next. */
export declare function readAnthropicFallbackBoundary(block: unknown): AnthropicFallbackBoundary | null;
/**
 * Drops pre-fallback thinking/tool calls while preserving the text prefix that
 * the serving model continued. Dropped tool calls must never execute or replay.
 */
export declare function applyAnthropicFallbackBoundary(params: {
    output: {
        content: Array<{
            type: string;
        }>;
        responseModel?: string;
        diagnostics?: AssistantMessageDiagnostic[];
    };
    boundary: AnthropicFallbackBoundary;
    provider: string;
}): void;