import type { CreateWorkstreamInput } from './engine.js';
export interface AttemptsValidation {
    /** True when any item requests best-of-N (attempts >= 2). */
    readonly hasAttempts: boolean;
    /** Hard rule breaks that must block a launch (worktree isolation + stable id when depended upon). */
    readonly violations: readonly string[];
    /** Non-blocking notes (e.g. an over-cap value the engine will clamp). */
    readonly notes: readonly string[];
}
/**
 * Validate a draft spec's best-of-N usage against the worktree-isolation and
 * stable-id (when depended upon) constraints. Non-leaf best-of-N is allowed.
 * Pure, no I/O. `violations` are hard (block launch); `notes` are advisory.
 */
export declare function validateAttempts(spec: CreateWorkstreamInput): AttemptsValidation;
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