/**
 * Query Helpers — Input Coercion Utilities
 *
 * Standard coercion helpers that safely convert MCP SDK inputs (which may
 * arrive as strings due to JSON serialization) into their expected types.
 *
 * Used with `z.preprocess()` to ensure bad input reaches the handler's
 * try/catch instead of causing raw -32602 protocol errors.
 */
/** Default number of rows returned by query tools */
export declare const DEFAULT_QUERY_LIMIT = 100;
/**
 * Coerce a value to a number. Returns `undefined` for non-numeric input
 * so Zod treats it as "not provided" instead of producing NaN.
 *
 * Usage: `z.preprocess(coerceNumber, z.number().optional())`
 */
export declare function coerceNumber(val: unknown): unknown;
/**
 * Coerce a value to a boolean. Handles string "true"/"false" from
 * MCP SDK serialization.
 *
 * Usage: `z.preprocess(coerceBoolean, z.boolean().optional())`
 */
export declare function coerceBoolean(val: unknown): unknown;
/**
 * Coerce a raw limit value to a usable number.
 * - `undefined` → `defaultLimit`
 * - `NaN` → `defaultLimit`
 * - `0` → `null` (meaning "unlimited")
 * - negative → `defaultLimit`
 * - positive → the value itself
 *
 * Works with both `z.preprocess(coerceNumber, ...)` and `z.coerce.number()`
 * outputs, safely handling NaN and undefined.
 */
export declare function coerceLimit(raw: unknown, defaultLimit?: number): number | null;
/**
 * Build a SQL LIMIT clause from a coerced limit value.
 * `null` means "no limit" — returns an empty string.
 */
export declare function buildLimitClause(limitVal: number | null): string;
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