/**
 * Graph Workflow Validation
 *
 * Validates graph workflow configurations to ensure they form valid DAGs
 * with proper structure and required default branches at decision points.
 */
import type { GraphWorkflowConfig } from './graph';
export interface DirectedGraphShape {
    readonly id: string;
    readonly nodeIds: readonly string[];
    readonly edges: readonly {
        readonly from: string;
        readonly to: string;
    }[];
    readonly entry: string;
}
/**
 * Shared structural DAG validation used by both graph configs and WorkflowIR.
 * Returns the first issue so each caller can preserve its public error type.
 */
export declare function findDirectedGraphIssue(shape: DirectedGraphShape, options: {
    readonly label: string;
    readonly requireReachable?: boolean;
}): string | undefined;
/**
 * Validation error for graph workflows
 */
export declare class GraphValidationError extends Error {
    workflowId: string;
    constructor(message: string, workflowId: string);
}
/**
 * Validate a graph workflow configuration.
 *
 * Checks:
 * - Entry node exists
 * - All node IDs are unique
 * - All edge references point to valid nodes
 * - Graph is a DAG (no cycles)
 * - Fork/join nodes reference valid targets
 * - Each decision point has a default branch
 * - Handoff targets reference valid agent nodes
 *
 * @param config - Graph workflow configuration to validate
 * @throws GraphValidationError if validation fails
 */
export declare function validateGraphWorkflow(config: GraphWorkflowConfig): void;
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