/**
 * @fileoverview String similarity utilities for fuzzy matching.
 *
 * Extracted from DirectClient for reuse in lazy-loading discovery tools.
 */
/**
 * Longest requested name (in UTF-16 code units) that `findSimilarTools` will
 * fuzzy-match. Longer names get no suggestions: Levenshtein costs
 * O(requested × candidate) per command, and the requested name is untrusted.
 * Also the default length for {@link truncateName}.
 */
export declare const MAX_SIMILARITY_INPUT_LENGTH = 128;
/**
 * Calculate similarity between two strings using Levenshtein distance.
 * Returns a value between 0 (completely different) and 1 (identical).
 */
export declare function calculateSimilarity(a: string, b: string): number;
/**
 * Find similar tool/command names for suggestions.
 * Returns tools with similarity >= 0.4, sorted by similarity.
 *
 * Returns no suggestions when `requestedTool` is longer than
 * {@link MAX_SIMILARITY_INPUT_LENGTH}.
 */
export declare function findSimilarTools(requestedTool: string, availableTools: string[], maxSuggestions?: number): string[];
/**
 * Shorten an untrusted name before echoing it in an error message.
 * Names longer than `maxLength` are cut to `maxLength` code units plus `…`.
 */
export declare function truncateName(name: string, maxLength?: number): string;
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