diff --git a/tests/app/test_channel_tab_sharing.py b/tests/app/test_channel_tab_sharing.py
index 58becd301..efa56e0a2 100644
--- a/tests/app/test_channel_tab_sharing.py
+++ b/tests/app/test_channel_tab_sharing.py
@@ -6,6 +6,8 @@
 product decision (tests/open_defects.toml, shared-channel-tab).
 """
 
+from agent_comms.channel_targets import CommandTarget
+
 
 async def two_sessions_on_one_channel(workspace, ui):
     for name in (workspace.project.name, "owner-a", "owner-b"):
@@ -35,7 +37,16 @@ async def test_going_back_from_a_shared_channel_tab_returns_to_the_session_it_wa
 async def test_a_shared_channel_tab_sends_as_the_session_it_was_opened_from(workspace):
     async with workspace.app(size=(120, 44)) as ui:
         first, second, channel = await two_sessions_on_one_channel(workspace, ui)
-        assert ui.sender_of(channel) == "owner-b"
+        await ui.write_draft("hello shared channel")
+        await ui.press("enter")
+
+        def sent_messages():
+            return tuple(message for message in workspace.comms.views.history_page(
+                CommandTarget.named("#all"),
+            ).messages if message.body == "hello shared channel")
+
+        await ui.until(sent_messages, why="the message on the wire")
+        assert sent_messages()[0].sender == "owner-b"
 
 
 async def test_closing_one_session_keeps_the_channel_tab_another_session_opened(workspace):
diff --git a/tests/support/ui.py b/tests/support/ui.py
index 89e1bd865..c2944f758 100644
--- a/tests/support/ui.py
+++ b/tests/support/ui.py
@@ -152,10 +152,6 @@ def can_go_forward(self) -> bool:
     async def open_preview(self, path) -> str:
         """Open a file preview tab for `path` and return its tab identity."""
 
-    @abstractmethod
-    def sender_of(self, identity: str) -> str:
-        """The thread name a channel or direct-message tab sends as."""
-
     @abstractmethod
     async def thread_renamed(self, owner: str, previous: str, current: str) -> None:
         """Tell the interface that the thread behind session tab `owner` was renamed on the wire."""
@@ -396,9 +392,6 @@ async def open_preview(self, path) -> str:
         await self.step()
         return identity
 
-    def sender_of(self, identity: str) -> str:
-        return self.app.workspace_sessions.require(identity).me
-
     async def thread_renamed(self, owner: str, previous: str, current: str) -> None:
         self.app.session_navigation.sync_identity(owner, previous, current)
         await self.step()
diff --git a/tests/textual/test_welcome_view.py b/tests/textual/test_welcome_view.py
index 6fba9e346..c90f2f1e6 100644
--- a/tests/textual/test_welcome_view.py
+++ b/tests/textual/test_welcome_view.py
@@ -2,6 +2,8 @@
 from toad.session_scope import AgentAttached
 
 from support.agents import peer
+from agent_comms.channel_targets import CommandTarget
+from agent_comms.read_basis import NamedViewer
 from agent_comms.threads import Thread
 
 HINT = "n new session"
@@ -64,14 +66,25 @@ async def test_opening_a_thread_run_elsewhere_opens_its_history_read_as_the_user
         await focus_row(ui, "ThreadStatusRow")
         await ui.press("enter")
         await ui.until(lambda: len(ui.tabs()) == 1, why="the thread's tab")
-        assert ui.sender_of(ui.selected_tab) == workspace.viewer
+        app, _ = ui.textual
+        assert app.selected_session.thread_identity.thread_name() == "scribe"
+        await ui.write_draft("hello scribe")
+        await ui.press("enter")
+
+        def sent_messages():
+            return tuple(message for message in workspace.comms.views.history_page(
+                CommandTarget.named("scribe"), viewer=NamedViewer(workspace.viewer),
+            ).messages if message.body == "hello scribe" and message.target == "scribe")
+
+        await ui.until(sent_messages, why="the message on the wire")
+        assert sent_messages()[0].sender == workspace.viewer
         assert not ui.shows(HINT)
 
 
 async def test_closing_the_last_tab_shows_the_view_again_and_starts_no_agent(workspace):
     async with workspace.app(session=False, binding=AgentAttached(peer("echo"))) as ui:
         await ui.until_shows(HINT)
-        await ui.press("n")
+        await ui.new_session()
         await ui.until(lambda: len(ui.tabs()) == 1, why="the new session's tab")
         await ui.until_agent_ready()
         assert not ui.shows(HINT)