/**
 * Model-capability discovery for Anthropic-family models.
 *
 * Two backends, dispatched by provider:
 *
 *  - github-copilot: GET {baseUrl}/models — OpenAI-style listing with rich
 *    `capabilities.supports` (adaptive_thinking, reasoning_effort, limits.
 *    max_context_window_tokens). The 1M context tier on Copilot is exposed
 *    as separate model ids (for example claude-opus-4.6-1m) rather than
 *    via a beta header; the bare id (claude-opus-4.6) is hard-capped at
 *    200k regardless of any beta header (which the relay rejects).
 *    Discovery surfaces every id the response returns so the user can
 *    select the right one in the picker.
 *
 *  - anthropic: GET {baseUrl}/v1/models — Anthropic-native with
 *    `capabilities.thinking.types.adaptive.supported`,
 *    `capabilities.effort.{max,xhigh}.supported`, `max_input_tokens`.
 *    The 1M context tier is gated by `anthropic-beta: context-1m-2025-08-07`
 *    on the same id; we detect it by making a second probe with that
 *    header and observing whether `max_input_tokens` rises.
 *
 *  - others (amazon-bedrock, google-vertex, etc.): no equivalent
 *    discovery endpoint; the static fallback table in
 *    anthropic-capabilities.ts is used.
 *
 * Discovery runs at most once per (provider, baseUrl, apiKey-hash) per
 * process. Concurrent calls join the same in-flight promise. Failures are
 * silent — we leave the static fallback in place and try again next
 * process. The discovery layer never throws back to the caller.
 *
 * The discovered registry entries (new model ids, corrected contextWindow)
 * are also pushed into the in-memory model registry via
 * `mergeDiscoveredModels` so the model picker reflects reality.
 */
import type { Api, Model } from "../types.js";
/**
 * Trigger discovery for a provider+baseUrl. Returns a Promise that resolves
 * once the capability cache has been populated (or the attempt has failed).
 * Subsequent calls with the same (provider, baseUrl) join the in-flight
 * promise.
 *
 * Never throws. On any error the static fallback remains in place.
 */
export declare function discoverAnthropicCapabilities(provider: string, baseUrl: string, apiKey: string, extraHeaders?: Record<string, string>): Promise<void>;
/** Test-only: clear discovery memo so tests can re-run. */
export declare function _clearDiscoveryStateForTests(): void;
/** Not for external use: called by models.ts at module load to wire the registry hook. */
export declare function _setRegistryHook(hook: (provider: string, model: Model<Api>) => void): void;
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