/**
 * [WHO]: extractAgentResult, truncateResult — result extraction and truncation per CC §11.2 (VS8)
 * [FROM]: Depends on @catui/agent-core for AgentMessage, ./agent-definition for MAX_RESULT_SIZE_CHARS
 * [TO]: Consumed by ./agent-tool
 * [HERE]: core/sub-agent/agent-result-extractor.ts - Sub-agent result extraction
 */
import type { AgentMessage } from "@catui/agent-core";
import type { AgentOutputCompleted, AgentSpawnMetadata, AgentUsage } from "./agent-input-output.js";
/**
 * Extract the result from a completed sub-agent run.
 * Matches CC's VS8 function exactly.
 *
 * Per CC §11.2:
 * 1. Find the last assistant message
 * 2. Extract text content from it
 * 3. If last message has no text, search backwards for one that does
 * 4. Calculate totals (tokens, tool use count, duration)
 * 5. Truncate at maxResultSizeChars (100,000)
 */
export declare function extractAgentResult(messages: AgentMessage[], agentId: string, metadata: AgentSpawnMetadata): AgentOutputCompleted;
/**
 * Truncate result content to maxResultSizeChars.
 * Per CC §VI step 14: maxResultSizeChars = 100,000 (1e5).
 */
export declare function truncateResult(result: AgentOutputCompleted, maxChars?: number): AgentOutputCompleted;
export declare function calculateTotalTokens(messages: AgentMessage[]): number;
export declare function calculateTotalToolUseCount(messages: AgentMessage[]): number;
export declare function calculateUsage(messages: AgentMessage[]): AgentUsage;