/**
 * v0.5 §5.6 — token usage → USD conversion for the Author loop budget envelope.
 *
 * Anthropic 2026 list pricing (per MTok):
 *   opus-4-7      input $15.00   output $75.00
 *   sonnet-4-6    input  $3.00   output $15.00
 *   haiku-4-5     input  $0.80   output  $4.00
 *
 * Cache pricing follows the Anthropic standard:
 *   cache_creation_input_tokens — 1.25× base input
 *   cache_read_input_tokens     — 0.10× base input
 *
 * The Author loop calls `usdFromUsage` after each Claude API response and
 * appends the result to `<org>/memory/author-costs.jsonl` (see
 * `author-budget.ts`). The number is intentionally not rounded — callers
 * that want a display-ready string format upstream.
 */
export type CostModel = "opus-4-7" | "sonnet-4-6" | "haiku-4-5";
export interface UsageBreakdown {
    input_tokens: number;
    output_tokens: number;
    cache_creation_input_tokens?: number;
    cache_read_input_tokens?: number;
}
export declare function usdFromUsage(usage: UsageBreakdown, model: CostModel): number;
/** Exposed for tests / diagnostics — list of supported model ids. */
export declare function supportedModels(): CostModel[];