/**
 * GeminiNativeProvider - Native Google Gen AI SDK implementation
 *
 * Uses the native @google/genai SDK instead of OpenAI-compatible endpoint.
 * This enables proper support for Gemini 3 models with thought signatures.
 *
 * @example
 * ```typescript
 * const provider = new GeminiNativeProvider({
 *   apiKey: process.env.GOOGLE_AI_API_KEY,
 * });
 *
 * const agent = new Agent({ provider });
 * ```
 */
import type { LLMProvider, Message, ChatOptions, StreamChunk } from './types.js';
/**
 * Configuration for GeminiNativeProvider
 */
export interface GeminiNativeProviderConfig {
    /**
     * Google AI API key
     */
    apiKey: string;
    /**
     * Default model to use
     * @default 'gemini-2.5-flash'
     */
    model?: string;
    /**
     * Default max tokens
     * @default 4096
     */
    maxTokens?: number;
    /**
     * Optional token estimator function (e.g., tiktoken).
     * When provided, debug payload reports token counts instead of char-based estimates.
     * Fallback: Math.ceil(text.length / 4)
     */
    estimateTokens?: (text: string) => number;
}
/**
 * GeminiNativeProvider implements LLMProvider using the native Google Gen AI SDK
 *
 * Benefits over OpenAI-compatible endpoint:
 * - Automatic thought signature handling for Gemini 3
 * - Native streaming support
 * - Full access to Gemini-specific features
 */
export declare class GeminiNativeProvider implements LLMProvider {
    readonly name = "gemini";
    private readonly client;
    private defaultModel;
    private readonly defaultMaxTokens;
    private readonly estimateTokensFn;
    constructor(config: GeminiNativeProviderConfig);
    getModel(): string;
    setModel(modelId: string): void;
    /**
     * Send messages and stream the response
     */
    chat(messages: Message[], options?: ChatOptions): AsyncIterable<StreamChunk>;
    /**
     * Count tokens in messages using tiktoken (cl100k_base encoding)
     */
    countTokens(messages: Message[]): Promise<number>;
    /**
     * Convert our Message format to Google's format
     */
    private convertMessages;
    /**
     * Convert content to Google's Part format
     */
    private convertContent;
    /**
     * Extract tool name from tool_use block that matches the given toolUseId
     */
    private extractToolName;
    /**
     * Convert our ToolDefinition to Google's FunctionDeclaration format
     */
    private convertTools;
    /**
     * Process a streaming chunk into StreamChunks
     */
    private processChunk;
    /**
     * Map errors to ProviderError
     */
    private mapError;
}
/**
 * Create a GeminiNativeProvider with API key from environment
 */
export declare function createGeminiNativeProvider(config?: Partial<GeminiNativeProviderConfig>): GeminiNativeProvider;