/**
 * [WHO]: Local bridge limits, errors, registry and session capability contracts
 * [FROM]: No runtime dependencies
 * [TO]: Session bridge transport and controller; not a public package protocol
 * [HERE]: extensions/optional/session-bridge/contracts.ts - private wire boundary
 */
export declare const MAX_BODY_BYTES = 32768;
export declare const MAX_MESSAGE_CHARS = 12000;
export declare const MAX_RECEIPTS = 128;
export interface BridgeDescriptor {
    version: 1;
    bridgeId: string;
    sessionId: string;
    cwd: string;
    pid: number;
    port: number;
    token: string;
    startedAt: string;
}
export interface BridgeHost {
    supervision?: import("../../../core/extensions-host/types.js").ExtensionAPI["supervision"];
    commands?: () => Array<{
        name: string;
        description?: string;
        source: string;
    }>;
    sessionId(): string;
    isIdle(): boolean;
    hasPendingMessages(): boolean;
    send(text: string, mode: "followUp" | "steer"): void;
    abort(): void;
}
export interface Receipt {
    requestId: string;
    status: "submitted" | "observed" | "failed";
    mode: "followUp" | "steer";
    submittedAt: string;
    observedAt?: string;
}
export declare class BridgeError extends Error {
    readonly status: number;
    constructor(status: number, message: string);
}
export declare function object(value: unknown): Record<string, unknown>;