/**
 * before_tool_call hook — inject file-context observations before Write/Edit tools.
 *
 * Matches CC PreToolUse behavior: before an agent modifies a file, inject
 * relevant observations so it doesn't repeat past mistakes or miss known patterns.
 *
 * Non-blocking: 500ms timeout, failures swallowed (Constitution Principle 3).
 */
import type { EngramRestClient, Observation } from '../client.js';
import type { PluginConfig } from '../config.js';
import type { BaseHookEvent, PluginHookContext } from '../types/openclaw.js';
export declare function formatFileContext(file: string, observations: Observation[]): string;
/**
 * Handle the before_tool_call hook.
 *
 * Detects file-modifying tools (Write/Edit), fetches relevant observations
 * from engram, and injects them as system context.
 */
export declare function handleBeforeToolCall(event: BaseHookEvent, ctx: PluginHookContext, client: EngramRestClient, config: PluginConfig): Promise<{
    appendSystemContext?: string;
} | void>;
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