/**
 * Feature detection for paired @mastra/core and @mastra/observability versions.
 *
 * `coreFeatures` is a hard peer dependency, so it can be imported statically.
 * `observabilityFeatures` is loaded via dynamic import so this exporter degrades
 * gracefully against older `@mastra/observability` versions that don't export it
 * (per the pattern documented in `observability/mastra/src/features.ts`).
 *
 * Detection runs once at module load. Callers consume the result through the
 * sync `isModelInferenceEnabled()` accessor, which conservatively returns
 * `false` until detection settles — long enough only to cover the microtask
 * window before any spans are emitted in practice.
 */
/**
 * Returns true when both packages report the `model-inference-span` feature,
 * meaning MODEL_INFERENCE spans are emitted by the tracker. Drives the
 * Datadog kind mapping and usage-source switch (legacy: MODEL_STEP carries
 * 'llm' kind + usage; new: MODEL_INFERENCE does).
 */
export declare function isModelInferenceEnabled(): boolean;
/**
 * @internal Test-only override. Allows tests to simulate a paired older or
 * newer `@mastra/observability` without juggling dynamic imports.
 */
export declare function __setObservabilityFeaturesForTest(features: ReadonlySet<string> | undefined): void;
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