import type { MCPContent, MCPResponse } from './types.js';
/**
 * Build an MCP tool response. The structured data is encoded as TOON text for
 * the wire (token-efficient, readable to the model) and also attached as
 * `structuredContent` so MCP clients that support it can consume it directly.
 *
 * TOON encoding throws on circular references; in that case we fall back to
 * a JSON-with-replacer string so the wire response always has *something*
 * usable instead of crashing the tool.
 *
 * Extra content blocks (e.g. images for screenshots) can be appended.
 */
export declare function respond(data: Record<string, unknown>, extra?: MCPContent[]): MCPResponse;
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