/** Deterministic per-request complexity scorer (Plan B). Pure module. */
import type { ModelProfile, RoutingRequest, Tier } from '../types/index.js';
import type { ComplexityScorerConfig } from '../types/schemas.js';
export interface ComplexityScore {
    readonly score: number;
    readonly confidence: number;
    readonly targetTier: Tier | null;
    readonly direction: 'upgrade' | 'downgrade' | null;
    readonly candidate_model_id: string | null;
    readonly estimated_output_tokens: number;
    readonly estimated_cost_pinned_usd: number;
    readonly estimated_cost_candidate_usd: number;
    readonly capability_gap: number;
    readonly reasons: readonly string[];
}
export interface ComplexityScorerInput {
    readonly request: RoutingRequest;
    readonly pinnedModel: ModelProfile;
    readonly fleet: readonly ModelProfile[];
    readonly config?: Partial<ComplexityScorerConfig>;
}
export declare function resolveInputTokens(request: RoutingRequest): number;
export declare function estimateOutputTokens(inputTokens: number, config: Pick<ComplexityScorerConfig, 'output_to_input_ratio'>): number;
export declare function estimateWeightedCostUsd(model: ModelProfile, inputTokens: number, outputTokens: number): number;
export declare function selectComplexityCandidate(fleet: readonly ModelProfile[], targetTier: Tier, inputTokens: number, outputTokens: number): ModelProfile | null;
export declare function scoreComplexity(input: ComplexityScorerInput): ComplexityScore;
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