export type CallSurface = 'mcp' | 'rpc';
export type CallOutcome = {
    ok: true;
} | {
    ok: false;
    code: string;
};
export type CallEvent = {
    surface: CallSurface;
    /** Route key (RPC) or MCP tool name. */
    route: string;
    durationMs: number;
    outcome: 'ok' | 'error';
    /** Present when `outcome` is `error` (builtin/domain code or synthetic tool error). */
    code?: string;
};
/** Extension point for Logfox or custom sinks. */
export type OnCall = (event: CallEvent) => void;
export declare function toCallEvent(input: {
    surface: CallSurface;
    route: string;
    durationMs: number;
    outcome: CallOutcome;
}): CallEvent;
/** Default sink — structured jsout info line. Does not replace HTTP access logs. */
export declare function defaultLogCall(event: CallEvent): void;
export declare function notifyCall(onCall: OnCall | undefined, input: {
    surface: CallSurface;
    route: string;
    startedAt: number;
    outcome: CallOutcome;
}): void;