import type { AgentMessage } from "@caupulican/pi-agent-core";
import type { AssistantMessage, UserMessage } from "@caupulican/pi-ai";
export declare const SANITIZED_CONTEXT_FORK_COMPACTION_PREFIX = "The parent conversation history before this point was compacted into the following checkpoint:\n\n<summary>\n";
export declare const SANITIZED_CONTEXT_FORK_COMPACTION_SUFFIX = "\n</summary>\n\n";
export type SanitizedContextForkMode = {
    kind: "none";
} | {
    kind: "all";
} | {
    kind: "last_user_turns";
    count: number;
};
export type SanitizedContextForkMessage = UserMessage | AssistantMessage;
/** Parse the eventual tool-facing `fork_turns` wire value without choosing a default policy. */
export declare function parseSanitizedContextForkMode(value: string): SanitizedContextForkMode;
/**
 * Select a bounded suffix of complete, sanitized user turns.
 *
 * Selection walks backward so an arbitrarily long source transcript never creates an unbounded
 * second projection. Bounds drop whole oldest turns; no message text is truncated. The result is a
 * detached chronological copy containing no tool protocol, tool results, reasoning, provider
 * signatures, custom/system/developer messages, mailbox controls, or incomplete assistant output.
 */
export declare function selectSanitizedContextFork(messages: readonly AgentMessage[], mode: SanitizedContextForkMode): SanitizedContextForkMessage[];
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