diff --git a/plugins/platforms/discord/adapter.py b/plugins/platforms/discord/adapter.py
index dc48a336f33..c34caa0c866 100644
--- a/plugins/platforms/discord/adapter.py
+++ b/plugins/platforms/discord/adapter.py
@@ -1626,6 +1626,31 @@ class DiscordAdapter(BasePlatformAdapter):
             return True
         return False
 
+    @staticmethod
+    def _is_discord_unknown_interaction(exc: BaseException) -> bool:
+        """True for Discord's expired interaction token error."""
+        code = getattr(exc, "code", None)
+        if code is None:
+            data = getattr(exc, "data", None)
+            if isinstance(data, dict):
+                code = data.get("code")
+        try:
+            code = int(code)
+        except (TypeError, ValueError):
+            code = None
+
+        status = getattr(exc, "status", None)
+        response = getattr(exc, "response", None)
+        if status is None and response is not None:
+            status = getattr(response, "status", None) or getattr(response, "status_code", None)
+        try:
+            status = int(status)
+        except (TypeError, ValueError):
+            status = None
+
+        message = str(exc).lower()
+        return code == 10062 or (status == 404 and "unknown interaction" in message)
+
     def _command_sync_mutation_interval_seconds(self) -> float:
         return _DISCORD_COMMAND_SYNC_MUTATION_INTERVAL_SECONDS
 
@@ -3964,9 +3989,22 @@ class DiscordAdapter(BasePlatformAdapter):
         if not await self._check_slash_authorization(interaction, command_text):
             return
 
-        await interaction.response.defer(ephemeral=True)
+        deferred_response = False
+        try:
+            await interaction.response.defer(ephemeral=True)
+            deferred_response = True
+        except Exception as e:
+            if not self._is_discord_unknown_interaction(e):
+                raise
+            logger.warning(
+                "[Discord] slash %s: interaction expired before defer. "
+                "Executing command anyway, skipping interaction followup.",
+                command_text,
+            )
         event = self._build_slash_event(interaction, command_text)
         await self.handle_message(event)
+        if not deferred_response:
+            return
         try:
             if followup_msg:
                 await interaction.edit_original_response(content=followup_msg)
diff --git a/tests/gateway/test_discord_slash_commands.py b/tests/gateway/test_discord_slash_commands.py
index 19710626ca6..f35ca2fa945 100644
--- a/tests/gateway/test_discord_slash_commands.py
+++ b/tests/gateway/test_discord_slash_commands.py
@@ -158,6 +158,34 @@ async def test_registers_native_restart_slash_command(adapter):
     )
 
 
+@pytest.mark.asyncio
+async def test_run_simple_slash_executes_when_defer_interaction_expired(adapter):
+    class UnknownInteraction(Exception):
+        status = 404
+        code = 10062
+
+    interaction = SimpleNamespace(
+        channel=_FakeTextChannel(channel_id=123, name="general"),
+        channel_id=123,
+        guild_id=456,
+        user=SimpleNamespace(id=42, name="Jezza", display_name="Jezza"),
+        response=SimpleNamespace(defer=AsyncMock(side_effect=UnknownInteraction("Unknown interaction"))),
+        edit_original_response=AsyncMock(),
+        delete_original_response=AsyncMock(),
+    )
+    adapter.handle_message = AsyncMock()
+
+    await adapter._run_simple_slash(interaction, "/reset", "Session reset~")
+
+    interaction.response.defer.assert_awaited_once_with(ephemeral=True)
+    adapter.handle_message.assert_awaited_once()
+    event = adapter.handle_message.await_args.args[0]
+    assert event.text == "/reset"
+    assert event.source.chat_id == "123"
+    interaction.edit_original_response.assert_not_awaited()
+    interaction.delete_original_response.assert_not_awaited()
+
+
 # ------------------------------------------------------------------
 # Auto-registration from COMMAND_REGISTRY
 # ------------------------------------------------------------------
@@ -1117,4 +1145,3 @@ def test_register_skill_command_autocomplete_filters_by_name_and_description(ada
     # (covered in other tests). The autocomplete filter itself is exercised
     # via direct function call in the real-discord integration path.
     assert skill_cmd.callback is not None
-