/**
 * Bounded stall detector.
 *
 * Detects no-progress at strategy/phase level using structured progress
 * observations (and call-level no-progress evidence from the 1.4.0 Tool Storm
 * Breaker). Proceeds through bounded stages:
 *
 *   none → warning → strategy_review → pivot_required → blocked
 *
 * It never permits infinite self-reflection. Legitimate waiting for a changing
 * external condition is not counted as stall when a bounded polling policy
 * exists.
 */
import type { ProgressAccumulator } from "./progress.js";
import type { StallLevel, StallState } from "./types.js";
export interface StallConfig {
    /** Turns without structured progress before a warning. */
    warningAfterNoProgressTurns: number;
    /** Calls without structured progress before a warning. */
    warningAfterNoProgressCalls: number;
    /** ... before strategy_review. */
    reviewAfterNoProgressTurns: number;
    reviewAfterNoProgressCalls: number;
    /** ... before pivot_required. */
    pivotAfterNoProgressTurns: number;
    pivotAfterNoProgressCalls: number;
    /** ... before blocked. */
    blockedAfterNoProgressTurns: number;
    blockedAfterNoProgressCalls: number;
}
export declare const DEFAULT_STALL_CONFIG: StallConfig;
export interface StallInput {
    progress: ProgressAccumulator;
    noProgressTurns: number;
    noProgressToolCalls: number;
    repeatedFailureFingerprint?: string;
    evidenceIds?: string[];
    oscillationCount?: number;
    config?: StallConfig;
}
export interface StallEvaluation {
    state: StallState;
    previousLevel?: StallLevel;
}
/**
 * Deterministically evaluate stall level from no-progress counts and the
 * structured progress accumulator. The accumulator is the authority on progress:
 * prose never resets stall.
 */
export declare function evaluateStall(input: StallInput): StallEvaluation;
/**
 * Poll-gating helper: a bounded polling policy counts as legitimate waiting,
 * not stall, when the poll observes a state change.
 */
export declare function pollProgress(previousHash: string | undefined, currentHash: string | undefined, hasStructure: boolean): boolean;
/** Stage the next action after a stall level. */
export declare function stallNextAction(level: StallLevel): "continue" | "self_review" | "review" | "pivot" | "escalate" | "block";
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