/**
 * SEP-2133 extensions map (modern path).
 *
 * On 2026-07-28, capabilities that used to be baked into the core spec are
 * negotiated as named extensions advertised on `server/discover`. NitroStack
 * derives this map from what the app actually registered:
 *
 * - `io.modelcontextprotocol/app` — advertised when any tool ships a UI
 *   component / `@Widget` (MCP Apps).
 * - `io.modelcontextprotocol/tasks` — advertised when any tool declares
 *   `taskSupport` other than `forbidden`.
 *
 * Apps may declare extra extensions via `@McpApp({ extensions })`, which are
 * merged in verbatim.
 *
 * @module
 */
/** Canonical extension identifier for MCP Apps. */
export declare const EXT_APP = "io.modelcontextprotocol/app";
/** Canonical extension identifier for the Tasks extension. */
export declare const EXT_TASKS = "io.modelcontextprotocol/tasks";
/** Per-extension advertisement payload (opaque capability object). */
export type ExtensionEntry = Record<string, unknown>;
/** The `extensions` capabilities map advertised on `server/discover`. */
export type ExtensionsMap = Record<string, ExtensionEntry>;
/** Inputs used to derive the advertised extensions. */
export interface ExtensionSignals {
    /** True when at least one tool is task-capable. */
    hasTasks: boolean;
    /** True when at least one tool ships a UI component/widget. */
    hasApps: boolean;
    /** Extra extensions declared by the app author. */
    declared?: ExtensionsMap;
}
/**
 * Build the extensions capability map for `server/discover`.
 */
export declare function buildExtensionsMap(signals: ExtensionSignals): ExtensionsMap;
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