/**
 * Tasks gate criterion (FR3): computed live at the command layer after
 * `evaluateGate`, following the traceability precedent — it evaluates even
 * when phase state is `complete` (AC-11) and never touches `evaluateGate`'s
 * contract.
 *
 * Applicability tri-state (DD7):
 *   null                      phase ≠ implementation, phase-implementation.yaml
 *                             absent (AC-30), or opt-in with no task-shaped
 *                             lines / missing file (AC-6)
 *   result, empty entries     only near-misses — warnings surface (AC-5), or
 *                             the required-scope backstops fired (AC-17, AC-28)
 *   result with entries       ≥1 valid task — full evaluation
 *
 * Bare AC refs resolve to the owning instance (DD8): a tasks file lives in
 * one instance's state dir, so its bare `AC-n` means this instance's AC-n —
 * traceability's cross-instance uniqueness rule (for free-floating test
 * files) does not transfer.
 *
 * Requirements: task-breakdown/AC-6, AC-11..AC-17, AC-28, AC-30
 */
import type { WorkflowTemplate } from '../core/types.js';
import type { TasksResult } from './types.js';
/** Message template for open tasks (DD6). */
export declare function openTaskMessage(id: number, title: string): string;
/** Message template for malformed deferrals (AC-2, DD6). */
export declare function malformedDeferralMessage(id: number): string;
/** Message for the missing/empty required-scope backstops (AC-17, AC-28). */
export declare function missingTasksMessage(kind: 'file' | 'empty'): string;
/**
 * Evaluate the tasks criterion for one instance.
 *
 * @param template - Resolved template; null degrades to opt-in semantics
 *   with a warning (defensive — both CLI call sites early-exit before this
 *   on resolution failure).
 * @returns null when the criterion does not evaluate (AC-6, AC-30);
 *   otherwise a result whose `openTasks`/`malformed`/`missing` the caller
 *   turns into unsatisfied criteria / gate violations via the message
 *   helpers above.
 */
export declare function evaluateTasksCriterion(projectRoot: string, instanceName: string, phaseName: string, template: WorkflowTemplate | null): TasksResult | null;
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