/**
 * Jina AI credential resolution.
 *
 * Single source of truth for the Jina AI API key (`JINA_API_KEY`).
 *
 * Capability-aware configuration (8J.1):
 * - Reader (`r.jina.ai`) is keyless — available without `JINA_API_KEY`.
 * - Search (`s.jina.ai`), DeepSearch (`deepsearch.jina.ai`), Quota, and
 *   the Search-based diagnostics probe all require `JINA_API_KEY`. Live
 *   probes confirmed they return HTTP 401 without a key.
 *
 * `isJinaConfigured` is capability-aware: when called with a specific
 * `capabilityId`, it checks the key requirement for that capability.
 * Without a `capabilityId`, it returns `true` whenever the Provider can
 * serve at least one capability keylessly (Reader), so the Doctor listing
 * and global availability checks still surface Jina.
 */
import type { ProviderCapability } from "../types.js";
/** Credential environment names read by this module (#232 derivation pin). */
export declare const ENV_NAMES: readonly ["JINA_API_KEY"];
export declare function resolveJinaApiKey(env: NodeJS.ProcessEnv): string | undefined;
export declare function isJinaConfigured(env: NodeJS.ProcessEnv, capabilityId?: ProviderCapability): boolean;
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