/**
 * Cache-busting fix for prompt prefix cache eviction.
 *
 * PROBLEM: Every PromptInput we send to OpenCode (notifications, idle
 * wakeups, ignored messages) creates a new user message. OpenCode's
 * `createUserMessage` resolves variant relative to the chosen agent. If
 * we don't pass model/variant, defaults take over and bust the provider
 * prefix cache that the previous assistant turn warmed.
 *
 * APPROACH: Mirror what `opencode-xtra` does in production. Read recent
 * messages from `client.session.messages()`, walk newest→oldest across
 * roles, and MERGE field-by-field so the newest context-bearing message
 * wins while older messages only fill fields it did not provide. Read BOTH
 * the flat shape (`info.providerID`) used by AssistantMessage and the
 * nested shape (`info.model.providerID`) used by UserMessage.
 *
 * IMPORTANT: This context is only meaningful for callers that DO trigger
 * LLM inference (e.g. background-bash idle wakes with `noReply: false`).
 * Callers using `noReply: true` (one-off ignored messages, warnings,
 * announcements) never trigger inference, so they don't need model or
 * variant — the model/variant pass-through there is unnecessary AND has
 * been observed to crash OpenCode under some configurations. Limit
 * model/variant pass-through to wake-style calls.
 */
export interface ResolvedPromptContext {
    agent?: string;
    model?: {
        providerID: string;
        modelID: string;
    };
    variant?: string;
}
export declare function resolvePromptContext(client: unknown, sessionId: string): Promise<ResolvedPromptContext | null>;
export interface LastAssistantModel {
    providerID: string;
    modelID: string;
    variant?: string;
}
/** @deprecated Use {@link resolvePromptContext} which also returns agent. */
export declare function getLastAssistantModel(client: unknown, sessionId: string): Promise<LastAssistantModel | null>;
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