/**
 * [WHO]: APIKeyGuidance, getAPIKeyGuidance(), formatGuidanceMessage()
 * [FROM]: No external dependencies
 * [TO]: Consumed by core/mcp/index.ts, core/mcp/mcp-adapter.ts
 * [HERE]: core/mcp/mcp-guidance.ts - API key guidance for MCP servers
 */
export interface APIKeyGuidance {
    /** Server ID */
    serverId: string;
    /** Server name */
    serverName: string;
    /** Whether key is required */
    required: boolean;
    /** API key environment variable name */
    envVar: string;
    /** User-friendly instructions */
    instructions: string;
    /** URL to get the key */
    getKeyUrl?: string;
    /** Free tier information */
    freeTier?: string;
    /** Alternative (skip key) */
    alternative?: string;
}
/**
 * Guidance for MCP servers that require API keys
 */
export declare const API_KEY_GUIDANCE: Record<string, APIKeyGuidance>;
/**
 * Get guidance for a specific server
 */
export declare function getAPIKeyGuidance(serverId: string): APIKeyGuidance | undefined;
/**
 * Check if a server requires an API key
 */
export declare function requiresAPIKey(serverId: string): boolean;
/**
 * Get list of servers that require API keys
 */
export declare function getRequiringAPIKeyServers(): string[];
/**
 * Get list of servers with optional API keys
 */
export declare function getOptionalAPIKeyServers(): string[];
/**
 * Format guidance as a user-friendly message
 */
export declare function formatGuidanceMessage(guidance: APIKeyGuidance, missingKey?: boolean): string;
/**
 * Get all servers that are configured but missing keys
 */
export declare function getMissingKeyServers(configuredServers: string[]): string[];