/**
 * Cold-start timing for one daemon process, reported once in `sandbox.ready`.
 *
 * The runtime bootstrap hands its own stage timings over in
 * `BOTLEARN_BOOTSTRAP_STARTUP_TIMINGS`; the daemon appends its stages so Agent
 * Service can log one launcher-to-ready timeline. Values are durations and epoch
 * milliseconds only — never paths, tokens or other payload content.
 */
export interface BootstrapStartupTimings {
    process_started_at_ms?: number;
    bootstrap_started_at_ms?: number;
    stages_ms: Record<string, number>;
    total_ms?: number;
}
export interface StartupTimingsPayload {
    bootstrap?: BootstrapStartupTimings;
    daemon_process_started_at_ms: number;
    daemon_stages_ms: Record<string, number>;
}
/** Parse the bootstrap hand-off; anything malformed is dropped, never thrown. */
export declare function parseBootstrapStartupTimings(raw: string | undefined): BootstrapStartupTimings | undefined;
/** Sequential stage timer: each mark records milliseconds since the previous mark. */
export declare class StartupTimer {
    private readonly bootstrap;
    private readonly now;
    private readonly processStartedAt;
    private last;
    private readonly stages;
    private reported;
    constructor(bootstrap: BootstrapStartupTimings | undefined, now?: () => number, processStartedAt?: number);
    mark(stage: string): void;
    /** Return the payload once; later reconnects of the same process report nothing. */
    takeReadyPayload(): StartupTimingsPayload | undefined;
}