import type { BuiltInHookDefinition } from "../types.ts";
/**
 * Creates the tool-pair-validator built-in hook.
 *
 * Scans the system prompt during `system.transform` for evidence
 * of tool_use/tool_result mismatches. When detected, injects a
 * correction reminder directly via `ctx.inject()`.
 *
 * This is a simplified guard — full message-scanning would require
 * a messages.transform event that rolebox does not yet expose.
 *
 * No engine dependency — pure guard with direct injection.
 *
 * @returns A configured BuiltInHookDefinition
 */
export declare function createToolPairValidatorHook(): BuiltInHookDefinition;
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