import { PolicyDecision, type PolicyEngineConfig, type PolicyRule } from './types.js';
/**
 * PolicyEngine evaluates tool execution requests against configured rules.
 * Rules are matched in priority order, with the highest priority rule winning.
 */
export declare class PolicyEngine {
    private readonly rules;
    private readonly defaultDecision;
    private readonly nonInteractive;
    constructor(config?: PolicyEngineConfig);
    /**
     * Evaluates a tool execution request and returns a policy decision.
     *
     * @param toolName - The name of the tool being executed
     * @param args - The arguments passed to the tool
     * @param serverName - Optional MCP server name (for spoofing prevention)
     * @returns PolicyDecision (ALLOW, DENY, or ASK_USER)
     */
    evaluate(toolName: string, args: Record<string, unknown>, serverName?: string): PolicyDecision;
    /**
     * Finds the highest priority rule matching the tool and args.
     *
     * @param toolName - The name of the tool
     * @param args - The tool arguments
     * @returns The matching rule, or undefined if none match
     */
    private findMatchingRule;
    /**
     * Validates that a tool name matches its claimed server name.
     * Returns null if spoofing is detected, otherwise returns the tool name.
     *
     * @param toolName - The tool name (may include server prefix)
     * @param serverName - The claimed server name
     * @returns The validated tool name, or null if spoofing detected
     */
    private validateServerName;
    /**
     * Returns all configured rules (for debugging/inspection).
     *
     * @returns Array of policy rules
     */
    getRules(): readonly PolicyRule[];
    /**
     * Returns the default decision used when no rules match.
     *
     * @returns PolicyDecision
     */
    getDefaultDecision(): PolicyDecision;
    /**
     * Returns whether the engine is in non-interactive mode.
     *
     * @returns boolean
     */
    isNonInteractive(): boolean;
    /**
     * Adds a new rule to the policy engine at runtime.
     * The rule is inserted into the sorted rules list based on its priority.
     *
     * @param rule - The policy rule to add
     */
    addRule(rule: PolicyRule): void;
}