/**
 * Memory Journal MCP Server - Tool Filtering
 *
 * Configurable tool filtering system with groups and meta-groups.
 * Matches mysql-mcp filtering syntax and patterns.
 */
import type { ToolGroup, ToolFilterConfig } from '../types/index.js';
import { TOOL_GROUPS, META_GROUPS } from './tool-constants.js';
export type { ToolFilterConfig } from '../types/index.js';
export { TOOL_GROUPS, META_GROUPS };
/**
 * Tools that are always enabled regardless of filter configuration.
 * Prevents agents from locking themselves out of the config system or Code Mode.
 */
export declare const ALWAYS_ENABLED_TOOLS: readonly ["update_configuration", "mj_execute_code"];
/**
 * Get all tool names across all groups
 */
export declare function getAllToolNames(): string[];
/**
 * Get the group for a specific tool
 */
export declare function getToolGroup(toolName: string): ToolGroup | undefined;
/**
 * Determine which tool groups have at least one enabled tool.
 * Used by instruction generation to conditionally include/exclude sections.
 */
export declare function getEnabledGroups(enabledTools: Set<string>): Set<ToolGroup>;
/**
 * Parse a tool filter string into configuration
 *
 * Syntax:
 * - `starter` - Use starter preset (whitelist mode)
 * - `core,search` - Enable specific groups (whitelist mode)
 * - `full,-admin` - All tools except admin group
 * - `starter,-delete_entry` - Starter without specific tool
 * - `+semantic_search` - Add specific tool to current set
 */
export declare function parseToolFilter(filterString: string): ToolFilterConfig;
/**
 * Check if a tool is enabled based on filter string
 */
export declare function isToolEnabled(toolName: string, filterConfig: ToolFilterConfig): boolean;
/**
 * Filter tools array based on filter configuration
 */
export declare function filterTools<T extends {
    name: string;
}>(tools: T[], filterConfig: ToolFilterConfig): T[];
/**
 * Get tool filter from environment variable
 */
export declare function getToolFilterFromEnv(): ToolFilterConfig | null;
/**
 * Calculate token savings from filtering
 */
export declare function calculateTokenSavings(totalTools: number, enabledTools: number, avgTokensPerTool?: number): {
    reduction: number;
    savedTokens: number;
};
/**
 * Get human-readable filter summary
 */
export declare function getFilterSummary(filterConfig: ToolFilterConfig): string;
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