/**
 * Options accepted by `experimental_setAttributes`.
 */
export interface ExperimentalSetAttributesOptions {
    /**
     * Permit attribute keys that start with the reserved `$` prefix.
     * **Default: `false`.**
     *
     * The `$` namespace is reserved for framework and library code that
     * is built on top of the workflow SDK (telemetry, agent metadata,
     * platform-emitted tags, etc.). User code MUST NOT write keys in
     * this namespace; validation rejects them so accidental collisions
     * with tooling-owned keys can't slip through.
     *
     * Only flip this to `true` if your caller is itself a framework or
     * library that owns a `$`-prefixed sub-namespace and knows the
     * conventions of any other tools writing into it. Misuse can
     * conflict with observability surfaces, agent dashboards, or future
     * platform features that rely on the reserved namespace.
     */
    allowReservedAttributes?: boolean;
}
/**
 * Attach plaintext string key/value metadata to the current workflow run.
 *
 * **EXPERIMENTAL.** The `experimental_` prefix is deliberate — the
 * shape, semantics, and dispatch path are likely to change before this
 * is renamed to a stable export. Use only when you can absorb a
 * breaking rename later.
 *
 * Callable only from a workflow body (`'use workflow'`). The call is
 * dispatched as a native `attr_set` event and materialized on the run.
 *
 * Validation runs in the VM (cheap, deterministic) before event
 * dispatch - violations throw `FatalError` without writing an event. An
 * empty record is a no-op. `value: undefined` removes the key from the
 * run's attribute map.
 *
 * **Reserved namespace.** Keys starting with `$` are reserved for
 * framework/library code (telemetry, agent metadata, etc.). User code
 * trying to write a `$`-prefixed key throws `FatalError`. If you are a
 * framework author and need to set a reserved key, pass
 * `{ allowReservedAttributes: true }` as the second argument — see
 * `ExperimentalSetAttributesOptions` for the trade-offs.
 *
 * **WARNING**: While this feature is experimental, calling e.g.
 * `Promise.all([experimental_setAttributes({ a: '1' }), experimental_setAttributes({ a: '2' })])`
 * is not guaranteed to be ordered consistently, but the equivalent
 * sequential `.then()` chain is.
 *
 * @example
 * ```ts
 * import { experimental_setAttributes } from 'workflow';
 *
 * export async function myWorkflow() {
 *   'use workflow';
 *   await experimental_setAttributes({ phase: 'init' });
 *   // ... work ...
 *   await experimental_setAttributes({ phase: 'done', orderId: 'ord_123' });
 *   await experimental_setAttributes({ orderId: undefined }); // remove
 * }
 * ```
 *
 * @example Framework / library code writing into the reserved namespace.
 * ```ts
 * await experimental_setAttributes(
 *   { '$agent.kind': 'durable-agent' },
 *   { allowReservedAttributes: true }
 * );
 * ```
 */
export declare function experimental_setAttributes(attrs: Record<string, string | undefined>, options?: ExperimentalSetAttributesOptions): Promise<void>;
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