diff --git a/tests/textual/test_saved_history_coverage.py b/tests/textual/test_saved_history_coverage.py
index 50146dc8c..f73d7fd84 100644
--- a/tests/textual/test_saved_history_coverage.py
+++ b/tests/textual/test_saved_history_coverage.py
@@ -4,10 +4,13 @@
 (agent text is line-drawn now, so a live message has no pager of its own).
 """
 
+from functools import partial
 
 from agent_comms.session_file import RegistrySessionLocation
 from agent_comms.threads import Thread
 from support import journals
+from toad.screens.main import MainScreen
+from toad.tab_identity.kinds import MailboxTab
 from toad.widgets.agent_response import AgentResponse
 from toad.widgets.session_details import SessionDetails
 from toad.widgets.transcript_history import TranscriptHistory
@@ -19,12 +22,20 @@ async def saved_history(workspace, ui):
                                  "Canonical retained source owns coverage independently of painted resources.",
                                  id=f"a{number}", parent=f"a{number - 1}" if number else None)
         for number in range(8)))
-    workspace.comms.registry.declare(Thread("saved", frozenset(), str(workspace.project), session_file=RegistrySessionLocation.from_path(journal, workspace.comms.root)))
-    page = workspace.comms.transcripts.thread_transcript_page("saved")
+    owner = workspace.comms.registry.declare(Thread(
+        "saved", frozenset(), str(workspace.project),
+        session_file=RegistrySessionLocation.from_path(journal, workspace.comms.root),
+    ))
+    root = str(workspace.comms.root)
+    await ui.app.session_navigation.new(
+        MailboxTab(owner.incarnation, root),
+        partial(MainScreen.from_thread, workspace.project, root, owner.incarnation),
+        original=(root, owner.incarnation),
+    )
     conversation = ui.conversation
-    ui.attach_agent(ui.detached_agent())
-    conversation.transcript.received(page)
-    await ui.until(lambda: conversation.contents.query_children(TranscriptHistory), why="the saved history")
+    await ui.until(lambda: conversation.transcript.reports_coverage,
+                   why="the retained owner's saved history")
+    page = workspace.comms.transcripts.thread_transcript_page(owner.name)
     return page, conversation.contents.query_children(TranscriptHistory).first(), conversation.query_one(SessionDetails)
 
 
@@ -32,19 +43,19 @@ async def test_saved_history_is_unavailable_while_its_source_is_parked_and_retur
     async with workspace.app(size=(110, 35)) as ui:
         page, history, details = await saved_history(workspace, ui)
         conversation = ui.conversation
-        await ui.until(lambda: "Saved history available" in details.title, why="saved history reported available")
+        await ui.until(lambda: "Saved history available" in str(details.title), why="saved history reported available")
         children, pages = tuple(history.walk_children()), tuple(history.pages)
 
         await history.retire_source(parked=True)
-        await conversation.transcript.reveal_retained(history)
-        await ui.until(lambda: "Saved history not loaded" in details.title, why="saved history reported not loaded")
+        await conversation.transcript.binding.reveal_retained(conversation.transcript, history)
+        await ui.until(lambda: "Saved history not loaded" in str(details.title), why="saved history reported not loaded")
         assert not history.state.reports_coverage
 
         conversation.transcript.received(page)
         await ui.until(lambda: history.state.reports_coverage, why="coverage reported again")
-        await ui.until(lambda: "Saved history available" in details.title, why="saved history reported available again")
+        await ui.until(lambda: "Saved history available" in str(details.title), why="saved history reported available again")
         assert "Saved history available" in details.overview_text
-        assert history in conversation.window.histories
+        assert history is conversation.transcript.binding.history
         assert tuple(history.pages) == pages
         assert tuple(history.walk_children()) == children
 
@@ -58,9 +69,9 @@ async def test_a_live_message_does_not_count_as_saved_history_coverage(workspace
             f"Live paragraph {i} is long enough to need more than one page." for i in range(32))))
         await ui.step()
         await history.retire_source(parked=True)
-        await conversation.transcript.reveal_retained(history)
-        await ui.until(lambda: "Saved history not loaded" in details.title, why="saved history reported not loaded")
+        await conversation.transcript.binding.reveal_retained(conversation.transcript, history)
+        await ui.until(lambda: "Saved history not loaded" in str(details.title), why="saved history reported not loaded")
         assert not conversation.transcript.reports_coverage
         conversation.transcript.received(page)
-        await ui.until(lambda: "Saved history available" in details.title, why="saved history reported available")
+        await ui.until(lambda: "Saved history available" in str(details.title), why="saved history reported available")
         assert tuple(history.pages) == pages