/** Shared DeepSeek Messages API endpoint and header policy. @module dsh-llm-deepseek/messages-api */
/** Required opt-in for Messages file operations and file-referenced image requests. */
export declare const MESSAGES_FILES_BETA = "files-api-2025-04-14";
/** Required opt-in for mid-conversation `tool_addition` and `tool_removal` blocks. */
export declare const MESSAGES_TOOL_CHANGES_BETA = "mid-conversation-tool-changes-2026-07-01";
/**
 * Resolve the API root without duplicating an explicit provider version path.
 * @param baseURL - validated configured endpoint root.
 * @returns the root beneath which Messages resources are exposed.
 */
export declare function messagesApiRoot(baseURL: string): string;
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