/**
 * Flow depth configuration, env/CLI flag parsing, and cycle detection.
 *
 * Extracted from index.ts for single-responsibility and testability.
 */
import type { ExtensionAPI } from "@earendil-works/pi-coding-agent";
export declare const DEFAULT_MAX_TRANSITION_DEPTH = 3;
export declare const FLOW_DEPTH_ENV = "PI_FLOW_DEPTH";
export declare const FLOW_MAX_DEPTH_ENV = "PI_FLOW_MAX_DEPTH";
export declare const FLOW_STACK_ENV = "PI_FLOW_STACK";
export declare const FLOW_PREVENT_CYCLES_ENV = "PI_FLOW_PREVENT_CYCLES";
export declare const FLOW_TOOL_OPTIMIZE_ENV = "PI_FLOW_TOOL_OPTIMIZE";
export interface FlowDepthConfig {
    currentDepth: number;
    maxDepth: number;
    canTransition: boolean;
    ancestorFlowStack: string[];
    preventCycles: boolean;
}
export declare function parseNonNegativeInt(raw: unknown): number | null;
export declare function parseBoolean(raw: unknown): boolean | null;
export declare function parseFlowStack(raw: unknown): string[] | null;
export declare function resolveFlowDepthConfig(pi: ExtensionAPI): FlowDepthConfig;
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