/**
 * BrowserAnthropicProvider — fetch-based Anthropic adapter for browsers.
 *
 * Pattern: Adapter (GoF). Zero peer dependencies — uses global `fetch`.
 * Role:    Outer ring. Same `LLMProvider` contract as `AnthropicProvider`,
 *          but skips `@anthropic-ai/sdk` (which doesn't bundle cleanly
 *          for browser). Aimed at playgrounds / prototypes where the
 *          user supplies their own key.
 * Emits:   N/A.
 *
 * Anthropic requires the `anthropic-dangerous-direct-browser-access: true`
 * header for direct browser-to-API calls. This is intentional — production
 * apps should proxy through a backend.
 *
 * ─── Limitations ────────────────────────────────────────────────────
 *
 * • Multi-modal NOT supported.
 * • Browser CORS — works because Anthropic explicitly allows the
 *   dangerous-direct header. Future API changes could require a proxy.
 */
import type { LLMCallHooks, LLMChunk, LLMProvider, LLMRequest, LLMResponse } from '../types.js';
export interface BrowserAnthropicProviderOptions {
    /** API key. REQUIRED — browser providers don't read env vars. */
    readonly apiKey: string;
    /** Default model when `LLMRequest.model` is `'anthropic'`. */
    readonly defaultModel?: string;
    /** Default max tokens. Default 4096. */
    readonly defaultMaxTokens?: number;
    /** Override the API URL (proxies, edge deployments, mocks). */
    readonly apiUrl?: string;
    /**
     * May the model ask for several tools at once in a single reply?
     * Mirror of `AnthropicProviderOptions.parallelToolCalls` — see there
     * for the full rationale.
     *
     * Anthropic's default is `true` (batching allowed). `false` caps the
     * model at one tool per reply, which keeps every tool result on its
     * own agent iteration so per-iteration analysis can attribute and
     * ablate each source separately. `true`/omitted sends nothing.
     *
     * @default undefined (Anthropic's default — batching allowed)
     */
    readonly parallelToolCalls?: boolean;
    /** @internal Custom fetch implementation for tests / workers. */
    readonly _fetch?: typeof fetch;
}
export declare function browserAnthropic(options: BrowserAnthropicProviderOptions): LLMProvider;
export declare class BrowserAnthropicProvider implements LLMProvider {
    readonly name = "browser-anthropic";
    private readonly inner;
    constructor(options: BrowserAnthropicProviderOptions);
    complete(req: LLMRequest, hooks?: LLMCallHooks): Promise<LLMResponse>;
    stream(req: LLMRequest, hooks?: LLMCallHooks): AsyncIterable<LLMChunk>;
}
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