/**
 * SEP-2106 full JSON Schema 2020-12 for tools (modern path only).
 *
 * The legacy path converts Zod with `target: 'jsonSchema7'` and inlines refs
 * (`$refStrategy: 'none'`), forcing `type: "object"` on both input and output —
 * unchanged so 2025-era clients never see unexpected keywords.
 *
 * On 2026-07-28 tool schemas are lifted to full JSON Schema 2020-12:
 * - input keeps an object root but may carry `oneOf`/`anyOf`/`allOf`,
 *   conditionals, and `$ref`/`$defs`
 * - output is unrestricted (not forced to an object)
 * - external `$ref` URIs are never auto-dereferenced and schema depth is bounded
 *
 * @module
 */
/** JSON Schema object (loose). */
export type JsonSchemaObject = Record<string, unknown>;
/** Maximum schema nesting depth accepted on the modern path (DoS guard). */
export declare const MAX_SCHEMA_DEPTH = 64;
/**
 * Bound the depth of a JSON schema object, replacing anything deeper than
 * `maxDepth` with a permissive `{}` so a pathological `$defs` graph cannot blow
 * the stack or the validator. External `$ref` URIs are left intact but are
 * never dereferenced by NitroStack.
 */
export declare function boundSchemaDepth(value: unknown, maxDepth?: number, depth?: number): unknown;
/**
 * Convert a Zod or JSON schema to JSON Schema 2020-12 for the modern era,
 * preserving composition (`oneOf`/`anyOf`/`allOf`), conditionals, and
 * `$ref`/`$defs`.
 *
 * @param schema - Zod schema or a pre-built JSON schema.
 * @param opts.root - `'input'` forces an object root (spec requirement for tool
 *   input); `'output'` leaves the schema unrestricted.
 */
export declare function convertToModernJsonSchema(schema: unknown, opts: {
    root: 'input' | 'output';
}): Promise<JsonSchemaObject>;
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