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diff --git a/src/tui/mailbox.hh b/src/tui/mailbox.hh
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+++ b/src/tui/mailbox.hh
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+/*
+ * Ricochet - A minimalist CLI web browser for fast, distraction-free navigation.
+ * Copyright (C) 2026  Richard Qin
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "ricochet/tui/session.hh"
+
+#include <cstddef>
+#include <deque>
+#include <mutex>
+#include <vector>
+
+namespace ricochet::tui::detail {
+
+class Mailbox
+{
+public:
+  Mailbox();
+  ~Mailbox();
+  Mailbox( const Mailbox& ) = delete;
+  Mailbox& operator=( const Mailbox& ) = delete;
+
+  PostResult post( HostUpdate update );
+  std::vector<HostUpdate> take( std::size_t limit );
+  int descriptor() const noexcept;
+  void close() noexcept;
+
+private:
+  int event_fd_;
+  std::mutex mutex_ {};
+  std::deque<HostUpdate> updates_ {};
+  bool closed_ { false };
+};
+
+} // namespace ricochet::tui::detail