import type { Plan } from './plan.js';
/**
 * What the model has done this session, gathered from the transcript already on screen.
 *
 * Asked for because a long run is opaque while it happens and unreadable afterwards: the tool
 * calls are all there in scrollback, hundreds of lines apart, and nobody scrolls back through
 * forty screens to count how many files were written.
 *
 * Built from the rows rather than from a second log kept alongside them. Two records of the same
 * events drift, and the one on screen would be the one that was wrong.
 */
export interface ActivityStep {
    kind: 'tool' | 'say';
    name?: string;
    detail?: string;
    ok?: boolean;
    startedAt?: number;
    endedAt?: number;
}
export interface ActivityRow {
    role: string;
    steps?: ActivityStep[];
    text?: string;
}
export interface ActivityTotals {
    turns: number;
    totalTokens: number;
}
export declare function describeActivity(rows: readonly ActivityRow[], plan: Plan | null, totals: ActivityTotals): string;
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