import { LLMProvider } from '../../providers/types.js';
import type { SkillRegistry } from '../../skills/types.js';
import type { Message, StepResult, Usage, ApproveToolFn, PermissionLevel, ProviderType, PersistenceBackend } from '../../core/types.js';
import type { Middleware } from '../../core/middleware.js';
/**
 * Outcome of a single `Agent.chat()` turn. Returned so non-readline callers
 * (the TUI) can render terminal states (aborted / max-steps / error) instead
 * of relying on chalk stdout. The readline path ignores it and prints the
 * same chalk messages as before.
 */
export interface ChatResult {
    finishReason: string;
    error?: string;
    usage?: Usage;
}
export declare class Agent {
    private provider;
    private messages;
    private model;
    private config;
    private autoConfirm;
    private skillRegistry;
    private skillCatalog;
    private abortController;
    private _middleware;
    private readonly systemPrompt;
    private readonly providerType;
    private readonly persistence;
    private sessionId;
    constructor(provider: LLMProvider, model?: string, config?: any, systemPrompt?: string, persistence?: PersistenceBackend | null, providerType?: ProviderType);
    initializeSkills(): Promise<void>;
    getSkillRegistry(): SkillRegistry | null;
    /** Set middleware pipeline (e.g., gateway semantic injection). */
    setMiddleware(middleware: Middleware[]): void;
    chat(userInput: string, signal?: AbortSignal, approveTool?: ApproveToolFn, permissionLevel?: PermissionLevel, onStep?: (step: StepResult) => void): Promise<ChatResult>;
    /**
     * Load a previously persisted session by id, replacing the in-memory history.
     * Re-seeds the system message if the loaded set has none. No-op when no
     * backend is configured.
     */
    loadSession(sessionId: string): Promise<boolean>;
    /** Active session id (rotated by `clearConversation` when persistence is on). */
    getSessionId(): string;
    /** Configured persistence backend, or null when persistence is disabled. */
    getPersistence(): PersistenceBackend | null;
    clearConversation(): void;
    /** Public accessor for the current message history. */
    getMessages(): Message[];
    /** Replace the message history (e.g., after compaction). */
    setMessages(messages: Message[]): void;
    /** Public accessor for the active LLM provider. */
    getProvider(): LLMProvider;
    /** Public accessor for the active model name. */
    getModel(): string;
    switchProvider(provider: LLMProvider, model: string): void;
    abort(): void;
    createAbortSignal(): AbortSignal;
    clearAbortController(): void;
}