/**
 * The error a provider-owned Activity reader throws and catches for its own
 * internal control flow. `detail` is native-granularity vocabulary private to
 * one reader; `reason` is the neutral projection that crosses the provider
 * seam.
 *
 * The `reason` values duplicate `AgentActivityError['reason']` from
 * `@excitedjs/dreamux-types` by value, not by type reference: this package
 * depends on nothing, including `@excitedjs/dreamux-types`, so it cannot
 * import that type. Core's Activity reader recognizes this shape structurally
 * (`error.name === 'AgentActivityError'` plus a known `reason` string), not
 * via `instanceof`, so this class needs no compile-time link to that
 * interface — only value-sync with the four reasons `dreamux-types` declares.
 */
export type ActivityErrorDetail = 'not_found' | 'session_mismatch' | 'locator_outside_root' | 'unreadable' | 'invalid' | 'scan_unsupported' | 'cursor_invalid' | 'cursor_query_mismatch' | 'cursor_stale';
export type ActivityErrorReason = 'session_unavailable' | 'cursor_invalid' | 'activity_corrupt' | 'provider_failure';
export declare class ActivityError extends Error {
    readonly detail: ActivityErrorDetail;
    readonly name = "AgentActivityError";
    readonly reason: ActivityErrorReason;
    constructor(detail: ActivityErrorDetail, message: string, options?: {
        cause?: unknown;
    });
}
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