/**
 * before_agent_start hook — fetches static session context from engram and
 * injects it as appendSystemContext so it is available for the entire session.
 *
 * This hook replaces the context-injection logic that was previously in
 * session_start. The SDK passes agent identity via ctx (not event), so all
 * identity resolution happens here via the ctx parameter.
 */
import type { EngramRestClient } from '../client.js';
import type { PluginConfig } from '../config.js';
import type { BeforeAgentStartEvent, BeforeAgentStartResult, PluginHookContext, PluginLogger } from '../types/openclaw.js';
/**
 * Handle the before_agent_start hook.
 *
 * @param event  - The before_agent_start event from OpenClaw.
 * @param ctx    - The hook context containing agent identity fields.
 * @param client - Shared engram REST client.
 * @param config - Resolved plugin config.
 * @param logger - Optional logger (falls back to console).
 * @returns      Append-system-context result, or void if nothing to inject.
 */
export declare function handleBeforeAgentStart(event: BeforeAgentStartEvent, ctx: PluginHookContext, client: EngramRestClient, config: PluginConfig, logger?: PluginLogger): Promise<BeforeAgentStartResult | void>;
/**
 * Build cacheable static instructions injected once per session.
 * These describe available engram capabilities to the agent.
 */
export declare function buildStaticInstructions(project: string): string;
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