/** Auth configuration for Anthropic */
export interface AnthropicAuthConfig {
    apiKey: string;
    baseUrl: string;
    isOAuth: boolean;
}
/**
 * Resolve the Anthropic base URL from the environment.
 *
 * Trusted sources only: the result becomes the request URL that carries the
 * Anthropic API key / OAuth token, so whatever can set it can redirect
 * authenticated traffic. `$env` merges the caller's `cwd/.env`, so reading it
 * there would let repository content choose where credentials are sent.
 */
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).
 */
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;