/** Task 1498 — the trustworthy caller signals a WhatsApp read tool forwards to
 *  the loopback route as HTTP headers, distinct from the caller-controlled
 *  `accountId` param. Both values are stamped into the spawn env by the platform
 *  (`ACCOUNT_ID`, `HOUSE_ADMIN_SCOPE` — the latter non-empty only for a
 *  non-specialist house admin) and inherited by the installed-plugin MCP child;
 *  the agent cannot set them. An empty value is omitted so the route reads it as
 *  absent (fail closed for a non-house caller). */
export declare function callerScopeHeaders(env: NodeJS.ProcessEnv): Record<string, string>;
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