/**
 * Anthropic Messages provider codec. Pure request/response translation between
 * OpenAI Chat Completions JSON and the Anthropic Messages API, including SSE
 * deltas. HTTP transport lives in `anthropic-backend.ts`.
 *
 * This is the outbound provider path (gateway → Anthropic). The inbound Claude
 * Code adapter lives under `adapters/anthropic-codec.ts`.
 */
import { type ChatBody } from "./backend-core.js";
import { type ProviderRecord } from "./protocol.js";
export declare function anthropicMessages(body: ChatBody, model: string): Record<string, unknown>;
export declare function anthropicThinkingValidationError(body: ChatBody): string | undefined;
export declare function openAiFinishReasonFromAnthropic(stopReason: unknown): string;
export declare function anthropicSseToChatChunks(event: string, item: ProviderRecord, model: string, blockTypes: Map<number, string>): unknown[];
export declare function fromAnthropicMessage(payload: ProviderRecord, model: string): unknown;