/**
 * Output Schema Extension Utility
 *
 * Extends tool output schemas to include the elicitation fallback response type.
 * This allows tools to return either their normal output OR an elicitation pending
 * response when the client doesn't support the standard elicitation protocol.
 */
/**
 * Extend a tool's output schema to include the elicitation fallback response type.
 *
 * When elicitation is enabled, tools may return an elicitation pending response
 * instead of their normal output. This function wraps the original schema in a
 * `oneOf` union to allow either response type.
 *
 * @param originalSchema - The tool's original output schema (may be undefined)
 * @returns Extended schema that allows either the original output or elicitation fallback
 *
 * @example
 * // Original schema:
 * { type: 'object', properties: { result: { type: 'string' } } }
 *
 * // Extended schema:
 * {
 *   oneOf: [
 *     { type: 'object', properties: { result: { type: 'string' } } },
 *     { type: 'object', properties: { elicitationPending: { ... } }, required: ['elicitationPending'] }
 *   ]
 * }
 */
export declare function extendOutputSchemaForElicitation(originalSchema: Record<string, unknown> | undefined): Record<string, unknown>;
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