/**
 * Brave Diagnostics Capability (brave-tech-plan §3, §7; T5).
 *
 * Probes Brave connectivity with a single, cheapest-possible request
 * — one `/res/v1/web/search` GET with a stub query — so the doctor
 * command can verify a credential authenticates without a generative
 * request. Brave has no `search_depth`-style knob (unlike Tavily), so
 * the probe sends a bare `q` and no other params.
 *
 * The probe performs exactly ONE attempt. Shared execution owns the
 * retry policy; this transport never retries. The doctor command
 * catches the throw on failure and records a redacted error entry.
 *
 * When `options.probe` is false, `invoke` resolves immediately without
 * touching the network — the doctor command skips probing unconfigured
 * Providers (passing `probe: false`) before reaching this Capability.
 *
 * Boundary rules (ARCHITECTURE.md §2):
 *   - May import the diagnostics capability contract, Adapter-local
 *     credentials, 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 BraveTransportDeps } from "./client.js";
/**
 * Options for the Brave DiagnosticsCapability. The API key is resolved
 * from `env`; transport dependencies (`fetch`, timer) are injectable
 * for deterministic tests through the unified `transport` seam.
 */
export interface BraveDiagnosticsCapabilityOptions {
    readonly env: NodeJS.ProcessEnv;
    readonly transport?: BraveTransportDeps;
}
/**
 * Build the Brave DiagnosticsCapability. The probe performs ONE
 * `/res/v1/web/search` request with a stub query (`scoutline-doctor-
 * probe`) and no params — the cheapest credible probe. 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
 * Providers before reaching this Capability.
 */
export declare function createBraveDiagnosticsCapability(options: BraveDiagnosticsCapabilityOptions): DiagnosticsCapability;
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