/**
 * Anthropic LLM scan provider.
 *
 * Talks to the Anthropic Messages API (`/v1/messages`). The Anthropic
 * request shape differs from the OpenAI-compatible surface in two ways:
 *   - `system` is a top-level string, not a `system` message role.
 *   - `max_tokens` is a required field on every request.
 * The response is an array of content blocks; the first block's `text`
 * field carries the model output.
 */
import type { LlmScanReport } from "../scanner/types.js";
import type { LlmScanInput, LlmScanProvider, LlmProviderOptions } from "./provider.js";
/**
 * Anthropic Messages API LLM scan provider.
 *
 * @see {@link LlmScanProvider}
 */
export declare class AnthropicLlmProvider implements LlmScanProvider {
    private readonly apiKey?;
    private readonly baseUrl;
    private readonly model;
    private readonly maxTokens;
    private readonly timeoutMs;
    private readonly maxInputChars;
    /**
     * @param options - Provider configuration. Env-var fallbacks:
     *   `apiKey` defaults to `process.env.ANTHROPIC_API_KEY`.
     */
    constructor(options?: LlmProviderOptions);
    /** @inheritdoc */
    scan(input: LlmScanInput): Promise<LlmScanReport>;
    /** @inheritdoc */
    testConnection(): Promise<boolean>;
    /**
     * Issue a POST to `/v1/messages` with timeout and error normalization.
     *
     * @param body - The JSON request body.
     * @param signal - Optional external abort signal combined with the owned
     *   timeout controller via `AbortSignal.any`. An external abort propagates
     *   as `DOMException('The operation was aborted.', 'AbortError')`.
     * @returns The `content[0].text` string from the response.
     * @throws {LlmProviderError} On network, timeout, HTTP, or shape errors.
     * @throws {DOMException} With name `AbortError` when `signal` is aborted.
     */
    private request;
}
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