/**
 * engram_timeline — fetch timeline of observations.
 *
 * WHEN TO USE: When exploring what happened recently in a project,
 * or when you need temporal context around a specific event.
 */
import type { EngramRestClient, Observation } from '../client.js';
import type { PluginConfig } from '../config.js';
import type { AnyAgentTool, OpenClawPluginToolContext } from '../types/openclaw.js';
export declare function createEngramTimelineTool(ctx: OpenClawPluginToolContext, client: EngramRestClient, config: PluginConfig): AnyAgentTool;
export declare function formatTimeline(observations: Observation[]): string;
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