/** Auth configuration for Anthropic */
export interface AnthropicAuthConfig {
    apiKey: string;
    baseUrl: string;
    isOAuth: boolean;
}
export declare function resolveAnthropicBaseUrlFromEnv(): string | undefined;
/**
 * Checks if a token is an OAuth token by looking for sk-ant-oat prefix.
 */
export declare function isOAuthToken(apiKey: string): boolean;
/**
 * Build an {@link AnthropicAuthConfig} from an already-resolved API key.
 *
 * `apiKey` is whatever the caller chose for `Authorization`/`x-api-key` —
 * usually `authStorage.getApiKey("anthropic")`. `baseUrl` overrides the
 * env-derived base; pass `undefined` to fall back to FOUNDRY/ANTHROPIC env
 * resolution and finally `DEFAULT_BASE_URL`.
 *
 * `isOAuth` is derived from the token prefix so the helper stays pure: callers
 * never have to thread the OAuth flag through their own resolution logic.
 */
export declare function buildAnthropicAuthConfig(apiKey: string, baseUrl?: string): AnthropicAuthConfig;
/**
 * Builds HTTP headers for Anthropic API requests (search variant).
 *
 * Forwards `ANTHROPIC_CUSTOM_HEADERS` when the resolver deems them applicable
 * (Foundry mode, or a non-Anthropic base URL — typically an enterprise
 * gateway), matching the streaming path so web search behaves identically.
 */
export declare function buildAnthropicSearchHeaders(auth: AnthropicAuthConfig): Record<string, string>;
/**
 * Builds the full API URL for Anthropic messages endpoint.
 */
export declare function buildAnthropicUrl(auth: AnthropicAuthConfig): string;