/**
 * You.com Diagnostics Capability (SPEC §6).
 *
 * Probes You.com connectivity with a single, cheapest-possible request —
 * `POST /v1/search` with `count: 1` and a stub query — so the doctor
 * command can verify a credential authenticates without burning deep
 * credits. Mirrors `providers/exa/diagnostics.ts`.
 *
 * The probe targets the index host (`ydc-index.io`) because the search
 * endpoint is the cheapest credible connectivity check; the research
 * host (`api.you.com`) hosts the expensive research runs and is never
 * probed. The probe is billable (SPEC §6 — `probeCostsCredit: true`).
 *
 * Boundary rules (ARCHITECTURE.md §2):
 *   - May import the diagnostics capability contract, Adapter-local
 *     config, Adapter-local search transport, and normalized errors.
 *   - Must NOT import command presentation or another Provider's
 *     Adapter.
 */
import type { DiagnosticsCapability } from "../../capabilities/diagnostics.js";
import { type YouTransportDeps } from "./client.js";
/**
 * Options for the You.com DiagnosticsCapability. The API key is
 * resolved from `env`; transport dependencies (`fetch`, timers) are
 * injectable for deterministic tests through the unified `transport`
 * seam.
 */
export interface YouDiagnosticsCapabilityOptions {
    readonly env: NodeJS.ProcessEnv;
    readonly transport?: YouTransportDeps;
}
/**
 * Build the You.com DiagnosticsCapability. The probe performs ONE
 * `/search` request with `count: 1` and a stub query so it costs the
 * cheapest credible request. Shared execution owns the retry policy;
 * this transport performs exactly one attempt per invocation.
 *
 * When `options.probe` is false, `invoke` resolves immediately without
 * touching the network — the doctor command skips probing unconfigured
 * or tools-disabled Providers before reaching this Capability.
 */
export declare function createYouDiagnosticsCapability(options: YouDiagnosticsCapabilityOptions): DiagnosticsCapability;
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