/**
 * message-classifier — content-based message classification for hook filtering.
 *
 * Provides an allowlist/blocklist approach to classify incoming prompts so that
 * hooks can skip low-value messages (heartbeats, SDK metadata) without duplicating
 * detection logic across multiple hook files.
 */
/** Semantic category of an incoming message. */
export type MessageCategory = 'user_prompt' | 'heartbeat' | 'system' | 'agent_internal';
/**
 * Classify an incoming message based on its content and optional tool name.
 *
 * Decision order:
 *   1. Heartbeat  — always block (workspace health check noise)
 *   2. System     — always block (SDK metadata, not a user query)
 *   3. Default    — treat as user_prompt (allow)
 *
 * @param prompt   - The raw prompt or message text to classify.
 * @param toolName - Optional tool name associated with the message (after_tool_call hook).
 * @returns        The most specific category that matches, or 'user_prompt' by default.
 */
export declare function classifyMessage(prompt: string, toolName?: string): MessageCategory;
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