import type { AgentMessage } from "@caupulican/pi-agent-core";
import type { Message } from "@caupulican/pi-ai";
export type ModelRouterBufferedSessionMessage = {
    kind: "message";
    message: Message;
} | {
    kind: "custom";
    message: Extract<AgentMessage, {
        role: "custom";
    }>;
};
export type ModelRouterSessionBuffer = {
    messages: ModelRouterBufferedSessionMessage[];
    /** True after the complete routed turn has been durably committed. */
    committed: boolean;
    /** True after the prompt prefix was durably committed before provider transport. */
    prefixCommitted: boolean;
    /** Number of AgentMessages (including custom messages) in the committed prefix, retained for live-suffix repair. */
    prefixMessageCount: number;
};
export declare function createModelRouterSessionBuffer(): ModelRouterSessionBuffer;
export declare function bufferModelRouterSessionMessage(buffer: ModelRouterSessionBuffer, message: Message): void;
export declare function bufferModelRouterSessionCustomMessage(buffer: ModelRouterSessionBuffer, message: Extract<AgentMessage, {
    role: "custom";
}>): void;
export declare function flushModelRouterSessionBuffer(buffer: ModelRouterSessionBuffer, appendBatch: (entries: readonly ModelRouterBufferedSessionMessage[]) => readonly string[]): Map<AgentMessage, string>;
/** Commit only the prompt prefix before provider transport; later assistant/tool messages remain buffered. */
export declare function flushModelRouterSessionBufferPrefix(buffer: ModelRouterSessionBuffer, appendBatch: (entries: readonly ModelRouterBufferedSessionMessage[]) => readonly string[]): Map<AgentMessage, string>;
//# sourceMappingURL=session-buffer.d.ts.map