/**
 * The outcome of classifying one ACP `session/update`. A `message` still needs
 * its chunks coalesced by the client; a `tool-call`/`tool-result` is a complete
 * canonical event body; an `ignored` update carries no canonical meaning.
 */
export type AcpClassifiedUpdate = {
    readonly kind: "message";
    readonly role: "assistant" | "reasoning" | "user";
    /** Groups streamed chunks into one message; `null` when the agent omits it. */
    readonly messageId: string | null;
    readonly text: string;
} | {
    readonly kind: "tool-call";
    readonly callId: string;
    readonly name: string;
    readonly args: unknown;
} | {
    readonly kind: "tool-result";
    readonly callId: string;
    readonly ok: boolean;
    readonly result: unknown;
} | {
    readonly kind: "ignored";
    readonly sessionUpdate: string;
    readonly reason: string;
};
/**
 * Classify one ACP `update` object (the `params.update` of a `session/update`
 * notification). Pure and total — every input yields a classification, malformed
 * or unknown ones landing in `ignored` with a diagnostic reason rather than
 * throwing, so a single odd notification can never abort an ingestion stream.
 */
export declare function classifyUpdate(value: unknown): AcpClassifiedUpdate;
/** One place where ACP is thinner than a native transcript (ADR 0062 §5). */
export interface AcpFidelityGap {
    /** The canonical concept that cannot be fully reconstructed from ACP alone. */
    readonly concept: string;
    /** Why ACP cannot carry it, and what a native transcript (slice 3) preserves. */
    readonly detail: string;
}
/**
 * The enumerated resume-fidelity gaps in the ACP backend — the documented reason
 * (ADR 0062 §5) the slice 3 native normaliser exists as a fallback path. This is
 * a derived source of truth: `normalize.test.ts` asserts the mapping above only
 * ever emits `assistant`/`reasoning`/`user`/`tool-call`/`tool-result`, so any
 * canonical event ACP *cannot* produce is accounted for here.
 */
export declare const ACP_FIDELITY_GAPS: readonly AcpFidelityGap[];