/**
 * Chain linter — validates chains beyond Zod schema.
 * Catches: undefined variable refs, unreachable steps, unused outputs,
 * missing pre-tool fields, router route refs, evaluator targets, and more.
 */
import type { ChainDefinition } from "./types.js";
export interface LintIssue {
    level: "error" | "warning" | "info";
    stepId?: string;
    message: string;
}
export declare function lintChain(chain: ChainDefinition): LintIssue[];
/** Dry-run a chain: resolve variables, show execution plan, no LLM calls. */
export declare function dryRunChain(chain: ChainDefinition, input: Record<string, string>): {
    issues: LintIssue[];
    plan: Array<{
        wave: number;
        stepId: string;
        label: string;
        model: string;
        dependsOn: string[];
        promptPreview: string;
    }>;
    estimatedCost: {
        totalSteps: number;
        parallelWaves: number;
        models: Record<string, number>;
    };
};