import type { Api, AssistantMessage, Model } from '@earendil-works/pi-ai';
import type { AgentEndEvent, ExtensionAPI, ExtensionContext } from '@earendil-works/pi-coding-agent';
/**
 * Registers the extension: after each turn, rephrases the reply for
 * speech with a small model and speaks it via macOS `say`. Falls back to
 * raw text if unavailable, or notifies instead of speaking when audio
 * can't play.
 *
 * @param pi - Subscribes to `agent_end`.
 */
export default function audioSummaryExtension(pi: ExtensionAPI): void;
/**
 * Extracts spoken-candidate text from the last `agent_end` message: the
 * last text part of an assistant/tool message, or a user message's raw
 * string content. Returns `undefined` if there's no last message or its
 * last part isn't text (e.g. a tool call).
 */
export declare function extractLastMessageText(messages: AgentEndEvent['messages']): string | undefined;
/** Joins every text part of an assistant response into a single string, discarding thinking/tool-call parts. */
export declare function extractAssistantMessageText(response: AssistantMessage): string;
/**
 * Resolves the summarization model: {@link SUMMARY_MODEL} parsed as
 * `<provider>/<id>` and looked up in `ctx.modelRegistry`, falling back to
 * `ctx.model` when unset, malformed, or unresolved.
 */
export declare function selectSummaryModel(ctx: ExtensionContext): Model<Api> | undefined;
/** Notifies the user once that {@link SUMMARY_MODEL} didn't resolve and summarization is using the current model instead. */
export declare function notifyUnresolvedSummaryModel(ctx: ExtensionContext): void;