/**
 * Schema → JSON Schema conversion shim.
 *
 * Historically this module was the in-tree zod-to-JSON-Schema converter.
 * After Phase B2 the conversion lives behind the `SchemaValidator`
 * contract (`toJsonSchema` / `isOptional`) and the zod-aware logic moved
 * to `extensions/ext-schema-zod/src/json-schema.ts`. This file is kept as a
 * back-compat surface so existing callers (`tool/registry.ts`,
 * `tool/factory.ts`, `workflow/registry.ts`, `routing/api/openapi/...`,
 * `mcp/server.ts`, `cli/mcp/server.ts`) continue to compile.
 *
 * Inputs must be opaque `Schema<T>` values produced by `defineSchema`.
 * Conversion is routed through the `SchemaValidator` contract so no
 * zod-specific logic remains in this file.
 *
 * @module tool/schema/zod-json-schema
 */
import type { JsonSchema } from "../../extensions/schema/index.js";
/**
 * Convert a `Schema<T>` into a JSON Schema document.
 *
 * Throws if the input is not a contract schema.
 */
export declare function zodToJsonSchema(schema: unknown): JsonSchema;
/**
 * Returns `true` when the schema permits `undefined`.
 */
export declare function isOptionalSchema(schema: unknown): boolean;
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