/** Task 1491 — the account a read tool scopes to. Explicit argument wins (the house
 *  admin reading a specific account); otherwise the calling session's own account
 *  (`ACCOUNT_ID`, stamped per-spawn by pty-spawner — the sub-account for a sub-account
 *  session); otherwise the legacy `"default"`. An empty env value is treated as
 *  absent so a boot-tolerant empty ACCOUNT_ID never scopes reads to "".
 *
 *  `"default"` is a sentinel, not a store key: the in-memory message store is keyed
 *  by platform UUID (Task 1532), so the platform read routes resolve `"default"` (the
 *  legacy waname / connection map key) to the socket-owning account's UUID before
 *  hitting the store (`resolveReadStoreKey`, Task 1535). This resolver has no access
 *  to the connection map — the UUID lives in the platform server, not the MCP env —
 *  so the sentinel is produced here and resolved there. */
export declare function resolveReadAccountId(explicit: string | undefined, envAccountId: string | undefined): string;
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