/**
 * W3C trace fields carried in MCP request `_meta` (SEP-414).
 *
 * Mastra passes these strings through without creating spans or validating
 * their format. Treat inbound values, especially `baggage`, as untrusted
 * observability data: never use them for authentication or authorization.
 */
export interface MCPTraceContext {
    traceparent: string;
    tracestate?: string;
    baggage?: string;
}
/**
 * Reads the W3C trace fields out of request metadata. Only string values are
 * accepted; a request without a `traceparent` carries no trace context.
 */
export declare function traceContextFromMeta(meta: Record<string, unknown> | undefined): MCPTraceContext | undefined;
/** Projects a trace context onto the `_meta` keys the specification defines. */
export declare function traceContextToMeta(traceContext: MCPTraceContext): Record<string, string>;
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