/**
 * Per-principal execution context (AsyncLocalStorage). The brain-call tracer fires for EVERY model
 * call — including council/team sub-tasks that run on the shared `subRunner` (a per-task tracer can't
 * reach those). To attribute spend to the right principal we wrap a task's execution in this ALS:
 * `node:async_hooks` propagates the store through every `await`, so a sub-task spawned inside a tool
 * call still reads the originating principal. Absent store = unattributed (dev / no principal).
 */
import { AsyncLocalStorage } from "node:async_hooks";
export declare const principalContext: AsyncLocalStorage<string>;
/** Run `fn` with `principal` as the ambient context (no-op wrapper when principal is undefined). */
export declare function withPrincipal<T>(principal: string | undefined, fn: () => T): T;
/** The principal attributed to the current async execution, if any. */
export declare function currentPrincipal(): string | undefined;
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