import type { FactRecord } from "../state/facts.js";
export declare const BLACKBOARD_MAX_ROUNDS = 3;
export interface BlackboardFinding {
    childFolder: string;
    round: number;
    payload: string;
    confidence?: number;
}
export interface SharedBlackboardOpts {
    dbPath: string;
    namespace: string;
    busyTimeoutMs?: number;
    maxRounds?: number;
}
/**
 * Bounded inter-agent exchange wrapper over one shared facts.db.
 * Opens the db in WAL mode with a busy_timeout so concurrent fleet
 * children can publish findings without SQLITE_BUSY deadlocks.
 *
 * bober: single-file SQLite WAL (better-sqlite3 synchronous writes);
 * swap for a network WAL (e.g. Turso/libSQL) if fleet grows beyond
 * one host or requires cross-machine exchange.
 */
export declare class SharedBlackboard {
    private store;
    private namespace;
    private maxRounds;
    private constructor();
    /**
     * Open (or create) a shared WAL facts.db at dbPath.
     * Ensures the parent directory exists before opening.
     * Returns a ready-to-use SharedBlackboard instance.
     */
    static open(opts: SharedBlackboardOpts): Promise<SharedBlackboard>;
    /**
     * Publish a finding from one fleet child.
     * Throws when finding.round exceeds the effective maxRounds cap.
     * Returns the persisted FactRecord.
     */
    publish(finding: BlackboardFinding, now: string): FactRecord;
    /**
     * Return all active 'finding' facts in this namespace published by
     * children OTHER than selfFolder.
     */
    readSiblings(selfFolder: string): FactRecord[];
    /** Return ALL active 'finding' facts in this namespace. */
    readAll(): FactRecord[];
    /** Close the underlying database connection. */
    close(): void;
}
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