import type { TraceContext } from '@crewx/sdk';
/**
 * Read cross-process trace context from inherited environment variables.
 *
 * This is the ONLY place in the CLI that reads CREWX_PARENT_TASK_ID /
 * CREWX_TRACE_ID / CREWX_CALLER_AGENT_ID. The values are passed as
 * options.trace into crewx.query/execute so the SDK's ALS takes over
 * from there — no direct env reads inside SDK code.
 *
 * Returns undefined when none of the three vars are set (root invocation).
 */
export declare function readInheritedTrace(): TraceContext | undefined;