/** Provider API key validation — hits each provider's models endpoint to verify the key works. */
/**
 * Result of an API key validation check performed by {@link validateApiKey}.
 *
 * @docLink packages/bridge/api-reference#validation
 */
export interface ValidationResult {
    /** `true` when the API key was accepted by the provider's models endpoint. */
    ok: boolean;
    /** Human-readable error description when `ok` is `false`. */
    error?: string;
}
/**
 * Validate an API key by sending a lightweight GET request to the provider's models endpoint.
 *
 * Returns `{ ok: true }` when the provider accepts the key (HTTP 2xx). Returns
 * `{ ok: false, error }` on 401/403 (invalid key), other HTTP errors, network failures,
 * or unsupported providers. Requests time out after 8 seconds.
 *
 * @param provider - Provider name matching a key in the shared `PROVIDER_ENDPOINTS` map
 *   (e.g. `"anthropic"`, `"openai"`, `"google"`).
 * @param key - API key to validate.
 * @param options - Optional base-URL / environment overrides; defaults to the
 *   provider's own API, or its `baseUrlEnv` value when one is set.
 * @returns Validation result with optional error description.
 * @docLink packages/bridge/api-reference#validation
 */
export declare function validateApiKey(provider: string, key: string, options?: {
    baseUrl?: string;
    env?: Record<string, string | undefined>;
}): Promise<ValidationResult>;
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