/**
 * SchemaUtils — Shared Schema Inspection & Validation Utilities
 *
 * Extracted helpers for inspecting Zod schema metadata and
 * asserting JSON Schema field compatibility across actions.
 *
 * Used by: SchemaGenerator, DescriptionGenerator, ToonDescriptionGenerator.
 *
 * Pure-function module: no state, no side effects.
 */
import { type ZodObject, type ZodRawShape } from 'zod';
import { type InternalAction } from '../types.js';
/**
 * Check if a value is a Zod schema (has `_def` property).
 *
 * Used by `defineTool` and `definePrompt` to distinguish
 * Zod schemas from JSON descriptor objects.
 */
export declare function isZodSchema(value: unknown): value is ZodObject<ZodRawShape>;
/**
 * Get the list of required field names from an action's Zod schema.
 * Returns an empty array if the action has no schema.
 */
export declare function getActionRequiredFields<TContext>(action: InternalAction<TContext>): string[];
export declare function assertFieldCompatibility(existing: object, incoming: object, field: string, actionKey: string): object | undefined;
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