/**
 * Adapter registry storage — kept separate from builtin registration so auth
 * and collect can import without pulling Slack/GitHub adapter modules.
 */
import type { ChannelProviderAdapter } from "./registry-types.js";
/** Register (or replace) a channel provider adapter. */
export declare function registerChannelAdapter(adapter: ChannelProviderAdapter): void;
/** Look up a registered adapter, or `undefined` if none. */
export declare function getChannelAdapter(provider: string): ChannelProviderAdapter | undefined;
/** Providers that may stamp trusted `x-mda-source-provider` on loopback invoke. */
export declare function trustedChannelSourceProviders(): ReadonlySet<string>;
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