/**
 * Model diversity resolver — returns >=2 distinct provider/model blocks by
 * enumerating DIFFERENT tiers from fleet tier-policy.
 *
 * PURE: no fs, no network, no clock. Reads only the static tier table.
 *
 * Distinctness comes from DIFFERENT tiers (within one tier planner==generator
 * ==evaluator all point at the same block, so deduplication must cross tiers).
 */
import type { RoleProviderBlock } from "../fleet/tier-policy.js";
/**
 * Canonical label for a block — used in notes and Finding evidence fields.
 * Stable: derived purely from the block's provider and model fields.
 */
export declare function modelLabel(b: RoleProviderBlock): string;
/**
 * Return >=2 DISTINCT provider/model blocks for a multi-model research run.
 *
 * Strategy: enumerate the non-default tiers in a fixed priority order and
 * dedup by `provider/model` label. The optional `tier` parameter seeds the
 * first block by placing that tier at the front of the scan order.
 *
 * Returns all 4 distinct blocks (cheap/standard/hard/frontier) in the
 * current tier-policy table; the runner takes the first >=2.
 */
export declare function diverseBlocks(tier?: string): RoleProviderBlock[];
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