import type { ConstrainedSamplingConfig } from "@bastani/pi-ai/compat";
export declare function areExperimentalFeaturesEnabled(): boolean;
/**
 * Experimental strict JSON-schema constrained sampling for built-in tool definitions.
 *
 * Returns a `prefer` (not `require`) constraint so providers without strict
 * support keep working, and `undefined` unless experimental features are enabled
 * (`ATOMIC_EXPERIMENTAL=1` or the legacy `PI_EXPERIMENTAL=1`), leaving tool
 * definitions unconstrained by default.
 */
export declare function getExperimentalToolSampling(): ConstrainedSamplingConfig | undefined;
/**
 * Tool-definition spread fragment for the experimental strict sampling above.
 *
 * Sets `constrainedSampling` only when the experimental gate is on. Key presence
 * is semantic through the tool plumbing (`Object.hasOwn` guards in
 * tool-definition-wrapper, agent-session-state, and loader-runtime), so an
 * unconstrained definition must keep the property absent rather than own it
 * with `undefined`.
 */
export declare function experimentalToolSamplingProperty(): {
    constrainedSampling: {
        type: "json_schema";
        strict: "prefer";
    };
} | Record<string, never>;
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