/**
 * before_prompt_build hook — per-turn dynamic context search.
 *
 * Queries engram with the current user prompt and injects the top matching
 * observations as prependContext so they appear immediately before the user's
 * message in each turn.
 */
import type { EngramRestClient } from '../client.js';
import type { PluginConfig } from '../config.js';
import type { BeforePromptBuildEvent, PromptBuildResult, PluginHookContext, PluginLogger } from '../types/openclaw.js';
/**
 * Handle the before_prompt_build hook.
 *
 * @param event  - The before_prompt_build event from OpenClaw.
 * @param ctx    - The hook context containing agent identity fields.
 * @param client - Shared engram REST client.
 * @param config - Resolved plugin config.
 * @returns      Context to prepend, or void if nothing to inject.
 */
export declare function handleBeforePromptBuild(event: BeforePromptBuildEvent, ctx: PluginHookContext, client: EngramRestClient, config: PluginConfig, logger?: PluginLogger): Promise<PromptBuildResult | void>;
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