/**
 * Compact Tool Result Formatting — Phase 2 of Advanced Token Optimization
 *
 * Replaces JSON.stringify for tool results in the LLM messages array.
 * Per-tool formatters strip JSON overhead (escaped newlines, metadata fields)
 * and produce a text format the LLM can parse just as well.
 *
 * Only affects what the LLM reads in its message history.
 * CLI formatters, events, and hooks still receive the raw ToolExecutionResult.
 */
/**
 * Format a tool result as compact text for LLM context.
 * Falls back to JSON.stringify for unknown tools or non-object results.
 */
export declare function compactToolResult(toolName: string, result: unknown, input?: Record<string, unknown>): string;