diff --git a/nanobot/channels/matrix.py b/nanobot/channels/matrix.py
index 1ace6ca..f85aab5 100644
--- a/nanobot/channels/matrix.py
+++ b/nanobot/channels/matrix.py
@@ -43,7 +43,7 @@ TYPING_NOTICE_TIMEOUT_MS = 30_000
 # https://spec.matrix.org/v1.17/client-server-api/#typing-notifications
 # Keepalive interval must stay below TYPING_NOTICE_TIMEOUT_MS so the typing
 # indicator does not expire while the agent is still processing.
-TYPING_KEEPALIVE_INTERVAL_SECONDS = 20.0
+TYPING_KEEPALIVE_INTERVAL_MS = 20_000
 MATRIX_HTML_FORMAT = "org.matrix.custom.html"
 MATRIX_ATTACHMENT_MARKER_TEMPLATE = "[attachment: {}]"
 MATRIX_ATTACHMENT_TOO_LARGE_TEMPLATE = "[attachment: {} - too large]"
@@ -606,13 +606,14 @@ class MatrixChannel(BaseChannel):
         return None
 
     async def send(self, msg: OutboundMessage) -> None:
-        """Send message text and optional attachments to a Matrix room, then clear typing state."""
+        """Send Matrix outbound content and clear typing only for non-progress messages."""
         if not self.client:
             return
 
         text = msg.content or ""
         candidates = self._collect_outbound_media_candidates(msg.media)
         relates_to = self._build_thread_relates_to(msg.metadata)
+        is_progress = bool((msg.metadata or {}).get("_progress"))
 
         try:
             failures: list[str] = []
@@ -641,7 +642,8 @@ class MatrixChannel(BaseChannel):
                     content["m.relates_to"] = relates_to
                 await self._send_room_content(msg.chat_id, content)
         finally:
-            await self._stop_typing_keepalive(msg.chat_id, clear_typing=True)
+            if not is_progress:
+                await self._stop_typing_keepalive(msg.chat_id, clear_typing=True)
 
     def _register_event_callbacks(self) -> None:
         """Register Matrix event callbacks used by this channel."""
@@ -713,7 +715,7 @@ class MatrixChannel(BaseChannel):
         async def _typing_loop() -> None:
             try:
                 while self._running:
-                    await asyncio.sleep(TYPING_KEEPALIVE_INTERVAL_SECONDS)
+                    await asyncio.sleep(TYPING_KEEPALIVE_INTERVAL_MS / 1000)
                     await self._set_typing(room_id, True)
             except asyncio.CancelledError:
                 pass
diff --git a/tests/test_matrix_channel.py b/tests/test_matrix_channel.py
index 47d7ec4..c6714c2 100644
--- a/tests/test_matrix_channel.py
+++ b/tests/test_matrix_channel.py
@@ -332,7 +332,7 @@ async def test_typing_keepalive_refreshes_periodically(monkeypatch) -> None:
     channel.client = client
     channel._running = True
 
-    monkeypatch.setattr(matrix_module, "TYPING_KEEPALIVE_INTERVAL_SECONDS", 0.01)
+    monkeypatch.setattr(matrix_module, "TYPING_KEEPALIVE_INTERVAL_MS", 10)
 
     await channel._start_typing_keepalive("!room:matrix.org")
     await asyncio.sleep(0.03)
@@ -1141,6 +1141,29 @@ async def test_send_stops_typing_keepalive_task() -> None:
     assert client.typing_calls[-1] == ("!room:matrix.org", False, TYPING_NOTICE_TIMEOUT_MS)
 
 
+@pytest.mark.asyncio
+async def test_send_progress_keeps_typing_keepalive_running() -> None:
+    channel = MatrixChannel(_make_config(), MessageBus())
+    client = _FakeAsyncClient("", "", "", None)
+    channel.client = client
+    channel._running = True
+
+    await channel._start_typing_keepalive("!room:matrix.org")
+    assert "!room:matrix.org" in channel._typing_tasks
+
+    await channel.send(
+        OutboundMessage(
+            channel="matrix",
+            chat_id="!room:matrix.org",
+            content="working...",
+            metadata={"_progress": True, "_progress_kind": "reasoning"},
+        )
+    )
+
+    assert "!room:matrix.org" in channel._typing_tasks
+    assert client.typing_calls[-1] == ("!room:matrix.org", True, TYPING_NOTICE_TIMEOUT_MS)
+
+
 @pytest.mark.asyncio
 async def test_send_clears_typing_when_send_fails() -> None:
     channel = MatrixChannel(_make_config(), MessageBus())