/**
 * FederationClient — discovers peers via sigil and queries their cortex instances.
 * Best-effort: network failures are logged, not thrown.
 */
export interface FederationPeer {
    agent_id: string;
    name: string;
    cortex_url: string;
    namespace: string | null;
    capabilities: string[];
}
export interface FederationSearchResult {
    source_agent: string;
    source_namespace: string | null;
    id: string;
    name: string;
    definition: string;
    category: string;
    score: number;
    confidence: number;
}
export interface AgentRegistrationPayload {
    agent_id: string;
    name: string;
    cortex_url?: string;
    namespace?: string;
    capabilities?: string[];
    version?: string;
}
export declare class FederationClient {
    private readonly sigilUrl;
    private readonly sigilToken?;
    constructor(sigilUrl: string, sigilToken?: string | undefined);
    /** Discover online peers from sigil registry. */
    discoverPeers(): Promise<FederationPeer[]>;
    /** Query a peer's cortex REST API for memories. */
    queryPeer(peer: FederationPeer, query: string, limit?: number): Promise<FederationSearchResult[]>;
    /** Register this agent with sigil. */
    registerSelf(reg: AgentRegistrationPayload): Promise<boolean>;
    /** Send heartbeat to sigil. */
    heartbeat(agentId: string): Promise<boolean>;
    /** Deregister from sigil. */
    deregisterSelf(agentId: string): Promise<boolean>;
    /** Build auth headers. */
    private authHeaders;
}
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