/**
 * Session-hierarchy tool — read-only navigation of session delegation trees.
 *
 * Four actions: get-children, get-parent-chain, get-delegation-depth, get-manifest.
 * All path construction uses safeSessionPath() with isValidSessionID() pre-validation.
 * Read-only (CQRS read-side). No mutation authority.
 * @module tools/hivemind/session-hierarchy
 */
import { tool } from "@opencode-ai/plugin/tool";
export declare function createSessionHierarchyTool(projectRoot: string): ReturnType<typeof tool>;
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