export declare const JSON_SCHEMA_DRAFT_2020_12_URI = "https://json-schema.org/draft/2020-12/schema";
/** Pre-check entrypoint. Exposed so callers can decide whether to take the upgrade path at all. */
export declare function schemaNeedsDraft202012Upgrade(schema: unknown): boolean;
/**
 * Upgrade legacy JSON Schema shapes to the draft 2020-12 form emitted by Zod.
 *
 * This keeps extension/MCP/TypeBox schemas compatible with providers whose tool
 * validators reject draft-07 tuple and dependency keywords.
 */
export declare function upgradeJsonSchemaTo202012(schema: unknown): unknown;