export type CallerLLMConfig = {
    /** Anthropic model id. Default `claude-haiku-4-5-20251001`. */
    model?: string;
    /** Anthropic API key. Falls back to `ANTHROPIC_API_KEY`. */
    apiKey?: string;
    /** Caller persona / scenario rules. Becomes the system prompt. */
    system: string;
    /** Max tokens per decision. Default 200. */
    maxTokens?: number;
};
export type CallerLLMDecision = {
    type: "speak";
    text: string;
} | {
    type: "silence";
    ms: number;
} | {
    type: "hangup";
    reason?: string;
};
/**
 * Ask the LLM for the next caller action given the running transcript.
 * Falls back to a clean hangup if the model output won't parse, so the test
 * always terminates.
 */
export declare const decideNextAction: (config: CallerLLMConfig, transcript: {
    speaker: string;
    text: string;
}[], lastService: string | null) => Promise<CallerLLMDecision>;
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