/** Input for filtration level computation. */
export interface FiltrationInput {
    readonly observedFiles: number;
    readonly totalFiles: number;
    readonly reReadCount: number;
}
/** Input for escalation decision. */
export interface EscalationInput {
    readonly filtrationLevel: number;
    readonly previousProjection: "outline" | "content";
    readonly readCount: number;
}
/** Result of escalation check. */
export interface EscalationResult {
    readonly escalate: boolean;
    readonly suggestedProjection: "outline" | "content";
    readonly reason?: string;
}
/**
 * Compute the filtration level for the current session.
 *
 * Ranges from 0 (fresh session) to 1 (fully saturated). Based on
 * the fraction of files observed and the number of re-reads.
 * As filtration grows, graft escalates detail — an agent that has
 * already explored the codebase should get richer projections.
 */
export declare function computeFiltrationLevel(input: FiltrationInput): number;
/**
 * Determine whether to escalate projection detail for a re-read.
 *
 * Monotone accumulation: as filtration grows, graft escalates.
 * An agent that outlined a directory and is now re-reading a file
 * in that directory should get content instead of another outline.
 */
export declare function shouldEscalateDetail(input: EscalationInput): EscalationResult;
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