/**
 * The shared bottom-layer Bot Framework REST client (spec §4.1) — written once
 * here, reused by the later agent-side tool-face step. Raw fetch only; no
 * botbuilder.
 */
/** Options for {@link MsTeamsClient}. */
export type MsTeamsClientOptions = {
    appId: string;
    clientSecret: string;
    /** Default "https://login.microsoftonline.com/botframework.com" — injectable for mocks. */
    loginBaseUrl?: string;
    fetchImpl?: typeof fetch;
    now?: () => number;
};
/** A failed connector-service call, with the HTTP status for callers to branch on. */
export declare class MsTeamsApiError extends Error {
    readonly status: number;
    constructor(status: number, message: string);
}
/**
 * Minimal Bot Framework connector-service client: client_credentials token
 * acquisition (cached) plus activity post/update against a channel-provided
 * serviceUrl. Honors 429 Retry-After with jittered backoff, max 3 tries.
 */
export declare class MsTeamsClient {
    private readonly opts;
    private readonly fetchImpl;
    private readonly now;
    private token?;
    constructor(opts: MsTeamsClientOptions);
    /** client_credentials token for scope https://api.botframework.com/.default; cached until exp-60s. */
    getToken(): Promise<string>;
    /** POST {serviceUrl}/v3/conversations/{conversationId}/activities[/{replyToId}] → { id }. */
    postActivity(serviceUrl: string, conversationId: string, activity: Record<string, unknown>, replyToId?: string): Promise<{
        id: string;
    }>;
    /** PUT {serviceUrl}/v3/conversations/{conversationId}/activities/{activityId}. Same retry policy. */
    updateActivity(serviceUrl: string, conversationId: string, activityId: string, activity: Record<string, unknown>): Promise<void>;
    private activitiesUrl;
    /**
     * Authorized JSON request honoring 429 Retry-After with jittered backoff,
     * max 3 tries. One 401 forces a fresh token and a single immediate retry.
     */
    private request;
}
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