/**
 * AgentCreditsClient — thin client for the `agentDeductCredits` Firebase callable.
 *
 * Called after each successful Gemini API call to deduct credits from the user's account.
 * Reads the CareerVivid API key from config and sends it with each request.
 */
export interface DeductResult {
    ok: true;
    creditsUsed: number;
    creditsRemaining: number;
    monthlyLimit: number;
}
export interface LimitReachedResult {
    ok: false;
    reason: "limit_reached";
    creditsRemaining: number;
}
export type CreditDeductionResult = DeductResult | LimitReachedResult;
export declare class AgentCreditsClient {
    private cvApiKey;
    private model;
    /** Running session totals */
    private sessionCreditsUsed;
    private lastKnownRemaining;
    constructor(cvApiKey: string, model: string);
    /**
     * Deduct credits for one API call.
     * Returns the result — callers should check result.ok and handle limit_reached.
     */
    deduct(calls?: number): Promise<CreditDeductionResult>;
    /** Total credits used in this session */
    get sessionUsed(): number;
    /** Last known remaining credits (may be null before first deduction) */
    get remaining(): number | null;
}
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