/** Exported for tests — reset tracker state without killing processes. */
export declare function clearBackgroundCompletionReminderForTests(): void;
/**
 * Mark an id as already surfaced (e.g. start tool result already included
 * an immediate exit). Prevents a duplicate system-reminder on the next drain.
 */
export declare function markBackgroundCompletionReported(id: string): void;
/**
 * Install the process-level lifecycle subscriber (idempotent).
 * Call once per agent-loop run (or once per process — safe either way).
 * Re-installs after clearBackgroundRegistryForTests / clearBackgroundCompletionState.
 */
export declare function ensureBackgroundCompletionTracker(): void;
/**
 * Drain unreported terminal background processes into human/model-readable
 * reminder strings. Each id is reported at most once.
 */
export declare function drainBackgroundCompletionReminders(): string[];
/** True when at least one unreported completion is queued. */
export declare function hasPendingBackgroundCompletions(): boolean;
/**
 * Build a single system message body for injection into the agent loop.
 * Returns null when there is nothing new to report.
 */
export declare function buildBackgroundCompletionSystemText(): string | null;
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