/**
 * Build a compact text transcript from agent messages for derive/evaluate.
 * Works backwards from the newest message so the most recent context survives
 * the char cap (same approach as pi-memory's serializer).
 */
export interface TranscriptResult {
    /** Formatted transcript, oldest included message first. */
    text: string;
    /** Count of text-bearing messages dropped because of the char cap. */
    omitted: number;
}
/**
 * Build the transcript and report how many text-bearing messages were dropped
 * to fit the cap. The evaluator uses `omitted` to decide whether to warn that
 * evidence may live in the truncated prefix (see buildTruncationNote).
 */
export declare function buildTranscriptWithMeta(messages: unknown[], maxChars: number): TranscriptResult;
export declare function buildTranscript(messages: unknown[], maxChars: number): string;
export declare function extractText(content: unknown): string;
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