import type { ModelContext, ModelContextWithResources, ToolDescriptor } from './types.js';
/** True only inside a browser-like environment (not SSR / workers / edge). */
export declare function isBrowserEnvironment(): boolean;
/**
 * Return the standard `document.modelContext`, falling back to the deprecated
 * `navigator.modelContext` alias. `document` is the canonical surface as of the
 * May 2026 spec change; the navigator getter is retained only for back-compat.
 * Returns `undefined` outside a browser or before the polyfill has installed.
 */
export declare function getModelContext(): ModelContext | undefined;
/** Same as {@link getModelContext}, typed to include the toolkit's resource extension. */
export declare function getModelContextWithResources(): ModelContextWithResources | undefined;
/**
 * SSR-safe convenience over `document.modelContext.registerTool(...)`, the
 * function-form counterpart of {@link registerResource}. Outside a browser (or
 * before the surface exists) it is a silent no-op, so tool modules can call it
 * unconditionally. In a browser it delegates to the standard method — the
 * descriptor is plain WebMCP, nothing Napster-specific.
 */
export declare function registerTool(tool: ToolDescriptor, options?: {
    signal?: AbortSignal;
}): void | Promise<void>;
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