/**
 * messageApiReceipt — the one mint the two message-API charts share, and the
 * one place that says when a chart may not mint at all.
 *
 * Role:  Lens. One pure function over what a `call-llm` stage already holds.
 *        It reads no scope, emits nothing and commits nothing — the caller
 *        commits what it returns, under `conventions.ts` · `RECEIPT_KEY`.
 * Reads: its arguments.
 * Emits: N/A.
 *
 * WHY THIS FILE EXISTS. `buildMessageApiChart` and `buildAgentMessageApiChart`
 * are deliberate twins — the second is the first plus tools, a router and a
 * loop — and a mint written out in both is two chances to disagree about what
 * the model was handed on charts whose whole job is to be the same shape. The
 * arguments differ per chart (one has tools, one does not); the RULE does not,
 * and the rule is what lives here.
 *
 * THE RULE: NO RUN ID, NO RECEIPT. Every hash a receipt carries is salted with
 * the run id (`receipt.ts`, the third law) so a short system prompt or a
 * two-word turn cannot be fingerprinted across runs, and a receipt is committed
 * state that travels inside recordings. These two charts are exported BUILDERS
 * handed to an executor the caller owns — nothing in a stage's scope carries
 * that executor's run id — so the salt has to be supplied, and when it is not
 * this returns `undefined` rather than minting with an empty one. `servedAt`
 * then declares the absence (`no-receipt-on-chart`, cause
 * `'no-receipt-committed'`) and rebuilds the view exactly as it always did: a
 * Lens may omit, never deny.
 */
import type { LLMMessage, LLMRequest, LLMToolSchema } from '../../provider-contract/types.js';
import { type Receipt, type SystemPieceRecord } from './receipt/receipt.js';
import type { ReceiptDigests } from './receipt/receiptDigests.js';
/** What a message-API chart's `call-llm` stage hands the mint. */
export interface MessageApiReceiptInput {
    /** The run this call belongs to, from the chart's `getRunId` dep. Absent or
     *  empty ⇒ no receipt — see the rule in this file's header. */
    readonly runId: string | undefined;
    /** The committed `iteration` at this call. */
    readonly epoch: number;
    readonly model: string;
    /** `LLMProvider.name` — the port the request went out through. */
    readonly provider: string;
    /** The joined system string, exactly as sent. */
    readonly systemText: string;
    /** The injection records it was joined from, in slot order. */
    readonly systemPieces: readonly SystemPieceRecord[];
    /** The conversation as sent, post-strip. */
    readonly messages: readonly LLMMessage[];
    /** The tool list as sent. Empty on a chart that serves none. */
    readonly tools: readonly LLMToolSchema[];
    /**
     * The request object the provider port is handed — the SAME object, not a
     * second literal built to describe it.
     *
     * It stands for both halves of the cache comparison because neither chart
     * runs a cache strategy: nothing rewrote the request between assembly and
     * the port, so `cache.transform` records `'unchanged'`. That is the verdict
     * an agent running a pass-through strategy records today, and it is true
     * here for the same reason — the request that went out is the request that
     * was assembled. `cache.strategy` records `null` beside it (9.93.0), which
     * is the half the verdict alone cannot say, and is what lets the served view
     * leave `cache-transform` off these charts.
     */
    readonly request: LLMRequest;
    /** The chart's receipt memo (`receipt/receiptDigests.ts`), when the
     *  chart loops: each message is then hashed once per run, not once per call.
     *  It changes no byte of the receipt. */
    readonly digests?: ReceiptDigests;
}
/**
 * Mint one message-API chart's receipt, or `undefined` when the chart was
 * given no run id to salt it with.
 *
 * @example
 * ```ts
 * const receipt = messageApiReceipt({
 *   runId: deps.getRunId?.(),
 *   epoch: 1,
 *   model,
 *   provider: provider.name,
 *   systemText: system,
 *   systemPieces: scope.systemPromptInjections ?? [],
 *   messages,
 *   tools: [],
 *   request,
 * });
 * if (receipt !== undefined) scope[RECEIPT_KEY] = receipt;
 * ```
 */
export declare function messageApiReceipt(input: MessageApiReceiptInput): Receipt | undefined;