diff --git a/apps/mobile/src/components/ProjectKnowledgeEntry.test.tsx b/apps/mobile/src/components/ProjectKnowledgeEntry.test.tsx
index 98937778754b1..66c63f17dad4a 100644
--- a/apps/mobile/src/components/ProjectKnowledgeEntry.test.tsx
+++ b/apps/mobile/src/components/ProjectKnowledgeEntry.test.tsx
@@ -227,7 +227,7 @@ vi.mock("../features/settings/appearance/AppearancePreferencesProvider", () => (
 }));
 vi.mock("../features/terminal/terminalTheme", () => ({ getMobileTerminalTheme: () => ({}) }));
 import { ComposerContextSheet } from "./ComposerContextSheet";
-import { ProjectKnowledgeEntry, requestRememberMessage } from "./ProjectKnowledgeEntry";
+import { ProjectKnowledgeEntry, requestProjectMemory } from "./ProjectKnowledgeEntry";
 
 const scope = {
   environmentId: EnvironmentId.make("mobile-memory"),
@@ -330,6 +330,7 @@ function setup(entries = [scope]) {
         ),
       ),
     rerender: () => act(() => root.render(renderEntries())),
+    openMemory: () => act(() => requestProjectMemory({ ...entries[0]!, message: null })),
     click: async (label: string) => {
       const button = [...container.querySelectorAll("button")].find(
         (item) => item.textContent === label || item.getAttribute("aria-label") === label,
@@ -400,7 +401,7 @@ it.each(["selection", "archive", "close", "unmount", "removal"] as const)(
           complete = resolve;
         }),
     );
-    await screen.click("Project memory");
+    screen.openMemory();
     if (change !== "removal") await screen.click("Select for draft");
     await screen.click("Attach to draft");
     if (change === "selection") await screen.click("Selected for draft");
@@ -410,7 +411,7 @@ it.each(["selection", "archive", "close", "unmount", "removal"] as const)(
       );
     if (change === "close") {
       await screen.click("Close");
-      await screen.click("Project memory");
+      screen.openMemory();
     }
     if (change === "unmount") screen.unmount();
     if (change === "removal") await screen.click("Remove from draft");
@@ -435,7 +436,7 @@ it("flags a fact whose citation is unavailable in the list", async () => {
     nextCursor: null,
     unavailableSources: [{ factId: fact.id, reason: "changed" }],
   };
-  await screen.click("Project memory");
+  screen.openMemory();
   expect(screen.container.textContent).toContain("Source changed");
 });
 
@@ -457,7 +458,7 @@ it("saves a remembered feed message with a citation to that message", async () =
     archived: false,
   };
   act(() =>
-    requestRememberMessage({
+    requestProjectMemory({
       environmentId: scope.environmentId,
       projectId: scope.projectId,
       draftKey: scope.draftKey,
@@ -487,7 +488,7 @@ it("shows user origin once without treating the assertion as a citation", async
     sources: [{ kind: "user" }],
   };
   state.list = { facts: [asserted], nextCursor: null };
-  await screen.click("Project memory");
+  screen.openMemory();
   await screen.click("Inspect fact: " + asserted.content);
   expect(screen.container.textContent?.match(/User assertion/g)).toHaveLength(1);
   expect(screen.container.textContent).toContain("No cited source");
@@ -496,7 +497,7 @@ it("shows user origin once without treating the assertion as a citation", async
 
 it("attaches the current selection", async () => {
   using screen = setup();
-  await screen.click("Project memory");
+  screen.openMemory();
   await screen.click("Select for draft");
   await screen.click("Attach to draft");
   expect(state.insert).toHaveBeenCalledWith(
@@ -513,7 +514,7 @@ it("attaches the current selection", async () => {
 
 it("edits a citationless agent observation as an explicit user assertion", async () => {
   using screen = setup();
-  await screen.click("Project memory");
+  screen.openMemory();
   await screen.click(`Inspect fact: ${fact.content}`);
   await screen.click("Edit");
   await screen.click("Save");
@@ -558,7 +559,7 @@ it("pages both result streams without restarting the other stream", async () =>
       ],
     },
   }));
-  await screen.click("Project memory");
+  screen.openMemory();
   const input = screen.container.querySelector(
     '[aria-label="Search project knowledge"]',
   ) as HTMLInputElement;
@@ -620,7 +621,7 @@ it.each([
 ] as const)("sends %s feedback against the fact's revision", async (label, helpful) => {
   using screen = setup();
   state.list = { facts: [{ ...fact, revision: 3 }], nextCursor: null };
-  await screen.click("Project memory");
+  screen.openMemory();
   await screen.click(`Inspect fact: ${fact.content}`);
   await screen.click(label);
   expect(state.mutate).toHaveBeenCalledWith({
@@ -638,7 +639,7 @@ it.each([
 
 it("forgets a fact only after the permanent-erase warning is confirmed", async () => {
   using screen = setup();
-  await screen.click("Project memory");
+  screen.openMemory();
   await screen.click(`Inspect fact: ${fact.content}`);
 
   await screen.click("Forget");
@@ -673,7 +674,7 @@ it("marks a superseded fact read-only and lists superseded facts on request", as
     facts: [{ ...fact, supersededBy: ProjectFactId.make("replacement") }],
     nextCursor: null,
   };
-  await screen.click("Project memory");
+  screen.openMemory();
   expect(screen.container.textContent).toContain("Superseded");
   await screen.click(`Inspect fact: ${fact.content}`);
   const labels = [...screen.container.querySelectorAll("button")].map((item) => item.textContent);
@@ -709,7 +710,7 @@ it("supersedes a fact with a new replacement and shows the returned conflict hin
       ],
     },
   });
-  await screen.click("Project memory");
+  screen.openMemory();
   await screen.click(`Inspect fact: ${fact.content}`);
   await screen.click("Supersede");
   await screen.click("Save");
@@ -737,7 +738,7 @@ it("treats a changed message source as the same selection and shows it as change
     facts: { state: "available", matches: [], coverage: "complete", nextCursor: null },
   });
   state.search = match("a".repeat(64));
-  await screen.click("Project memory");
+  screen.openMemory();
   const input = screen.container.querySelector(
     '[aria-label="Search project knowledge"]',
   ) as HTMLInputElement;
@@ -790,7 +791,7 @@ it("replaces a changed source with its current version on request", async () =>
     maxBytes: 48_000,
   });
   state.draft = { text: reference.text, context: { records: [reference.record] } };
-  await screen.click("Project memory");
+  screen.openMemory();
   const input = screen.container.querySelector(
     '[aria-label="Search project knowledge"]',
   ) as HTMLInputElement;
@@ -818,7 +819,7 @@ it("removes the attached draft reference when the selection changes and says so"
   state.setText.mockImplementation((_key: string, text: string) => {
     state.draft = { text };
   });
-  await screen.click("Project memory");
+  screen.openMemory();
   expect(screen.container.textContent).toContain("is attached to this draft");
   await screen.click("Selected for draft");
   expect(state.setText).toHaveBeenCalledWith(scope.draftKey, "See");
@@ -836,7 +837,7 @@ it("drops a revised fact from the selection and the draft after saving", async (
   state.setText.mockImplementation((_key: string, text: string) => {
     state.draft = { text };
   });
-  await screen.click("Project memory");
+  screen.openMemory();
   await screen.click(`Inspect fact: ${fact.content}`);
   await screen.click("Confirm");
   expect(state.setText).toHaveBeenCalledWith(scope.draftKey, "");
@@ -862,7 +863,7 @@ it("opens only the destination composer for a remembered message from another th
     archived: false,
   };
   act(() =>
-    requestRememberMessage({
+    requestProjectMemory({
       environmentId: scope.environmentId,
       projectId: scope.projectId,
       draftKey: "other-thread-draft",
@@ -883,7 +884,7 @@ it("ignores remember requests while the destination entry is unfocused", () => {
   state.focused = false;
   screen.rerender();
   act(() =>
-    requestRememberMessage({
+    requestProjectMemory({
       environmentId: scope.environmentId,
       projectId: scope.projectId,
       draftKey: scope.draftKey,
@@ -901,7 +902,7 @@ it.each(["Hardware Back", "Header Back"])(
   async (back) => {
     using screen = setup();
     state.androidSheet = true;
-    await screen.click("Project memory");
+    screen.openMemory();
     await screen.click("Select for draft");
     await screen.click("Inspect fact: " + fact.content);
     await screen.click(back);
@@ -917,7 +918,7 @@ it.each(["Hardware Back", "Header Back"])(
   async (back) => {
     using screen = setup();
     state.androidSheet = true;
-    await screen.click("Project memory");
+    screen.openMemory();
     await screen.click(back);
     expect(screen.container.textContent).not.toContain("Search");
   },
@@ -928,7 +929,7 @@ it.each(["Hardware Back", "Header Back", "Back", "Cancel"])(
   async (back) => {
     using screen = setup();
     state.androidSheet = true;
-    await screen.click("Project memory");
+    screen.openMemory();
     await screen.click("Inspect fact: " + fact.content);
     await screen.click("Edit");
     const input = screen.container.querySelector('[aria-label="Fact content"]') as HTMLInputElement;
diff --git a/apps/mobile/src/components/ProjectKnowledgeEntry.tsx b/apps/mobile/src/components/ProjectKnowledgeEntry.tsx
index 0126a863457ed..a664c574a46a3 100644
--- a/apps/mobile/src/components/ProjectKnowledgeEntry.tsx
+++ b/apps/mobile/src/components/ProjectKnowledgeEntry.tsx
@@ -79,17 +79,30 @@ type Page =
   | { readonly kind: "source"; readonly ref: SourceRef }
   | { readonly kind: "remember"; readonly ref: SourceRef }
   | { readonly kind: "editor"; readonly mode: FactEditorMode };
-type RememberRequest = {
+type OpenRequest = {
   readonly environmentId: EnvironmentId;
   readonly projectId: ProjectId;
   readonly draftKey: string;
-  readonly message: MessageCitation;
+  readonly message: MessageCitation | null;
 };
 
-// The feed asks the composer's entry to open, since the sheet writes to that draft.
-const rememberListeners = new Set<(request: RememberRequest) => void>();
-export function requestRememberMessage(request: RememberRequest): void {
-  for (const listener of rememberListeners) listener(request);
+// The header and feed ask the composer's entry to open, since the sheet writes to that draft.
+const openListeners = new Set<(request: OpenRequest) => void>();
+export function requestProjectMemory(request: OpenRequest): void {
+  for (const listener of openListeners) listener(request);
+}
+
+/** Opens project memory for a composer draft; undefined when the server has no project memory. */
+export function useOpenProjectMemory(
+  environmentId: EnvironmentId,
+  projectId: ProjectId | undefined,
+  draftKey: string,
+) {
+  const config = useAtomValue(serverEnvironment.configValueAtom(environmentId));
+  const open = useCallback(() => {
+    if (projectId) requestProjectMemory({ environmentId, projectId, draftKey, message: null });
+  }, [environmentId, projectId, draftKey]);
+  return config?.environment.capabilities.projectKnowledge === true && projectId ? open : undefined;
 }
 
 export function ProjectKnowledgeEntry(props: Scope) {
@@ -97,8 +110,9 @@ export function ProjectKnowledgeEntry(props: Scope) {
   const config = useAtomValue(serverEnvironment.configValueAtom(props.environmentId));
   const [open, setOpen] = useState<{ readonly seed: MessageCitation | null } | null>(null);
   const { environmentId, projectId, draftKey } = props;
+  // oxlint-disable-next-line t3code/no-unreasoned-state-sync -- registers this entry with the header and feed open requests while mounted
   useEffect(() => {
-    const listener = (request: RememberRequest) => {
+    const listener = (request: OpenRequest) => {
       if (
         isFocused &&
         request.environmentId === environmentId &&
@@ -107,33 +121,23 @@ export function ProjectKnowledgeEntry(props: Scope) {
       )
         setOpen({ seed: request.message });
     };
-    rememberListeners.add(listener);
+    openListeners.add(listener);
     return () => {
-      rememberListeners.delete(listener);
+      openListeners.delete(listener);
     };
   }, [environmentId, projectId, draftKey, isFocused]);
-  if (config?.environment.capabilities.projectKnowledge !== true) return null;
+  if (config?.environment.capabilities.projectKnowledge !== true || !open || !isFocused)
+    return null;
   return (
-    <>
-      <Button
-        label="Project memory"
-        icon="brain"
-        onPress={() => setOpen({ seed: null })}
-        tone="text"
-        accessibilityHint="Search and attach evidence from this project"
-      />
-      {open && isFocused ? (
-        <ProjectKnowledgeSheet
-          key={`${props.environmentId}:${props.projectId}:${props.draftKey}:${open.seed?.messageId ?? ""}`}
-          {...props}
-          // Older servers lack readFact, status and supersede.
-          history={config.environment.capabilities.projectKnowledgeHistory === true}
-          assisted={config.environment.capabilities.projectKnowledgeAssistedLearning === true}
-          seedMessage={open.seed}
-          onClose={() => setOpen(null)}
-        />
-      ) : null}
-    </>
+    <ProjectKnowledgeSheet
+      key={`${props.environmentId}:${props.projectId}:${props.draftKey}:${open.seed?.messageId ?? ""}`}
+      {...props}
+      // Older servers lack readFact, status and supersede.
+      history={config.environment.capabilities.projectKnowledgeHistory === true}
+      assisted={config.environment.capabilities.projectKnowledgeAssistedLearning === true}
+      seedMessage={open.seed}
+      onClose={() => setOpen(null)}
+    />
   );
 }
 
@@ -175,6 +179,7 @@ function ProjectKnowledgeSheet(
     editorDirty.current = dirty;
   }, []);
   const selectionVersion = useRef(0);
+  // oxlint-disable-next-line t3code/no-unreasoned-state-sync -- invalidates in-flight selection work when the sheet unmounts
   useEffect(
     () => () => {
       selectionVersion.current += 1;
diff --git a/apps/mobile/src/components/useRememberMessage.ts b/apps/mobile/src/components/useRememberMessage.ts
index f550f92e7f13c..456e353f8ade1 100644
--- a/apps/mobile/src/components/useRememberMessage.ts
+++ b/apps/mobile/src/components/useRememberMessage.ts
@@ -5,7 +5,7 @@ import type { EnvironmentId, MessageId, ThreadId } from "@t3tools/contracts";
 import { projectKnowledge } from "../state/projectKnowledge";
 import { serverEnvironment } from "../state/server";
 import { environmentThreadShells } from "../state/threads";
-import { requestRememberMessage } from "./ProjectKnowledgeEntry";
+import { requestProjectMemory } from "./ProjectKnowledgeEntry";
 
 /** Returns a "Remember for this project" action, or null when this thread cannot save facts. */
 export function useRememberMessage(
@@ -22,5 +22,5 @@ export function useRememberMessage(
   if (config?.environment.capabilities.projectKnowledge !== true || !canMutate || !projectId)
     return null;
   return (message: { readonly threadId: ThreadId; readonly messageId: MessageId }) =>
-    requestRememberMessage({ environmentId, projectId, draftKey, message });
+    requestProjectMemory({ environmentId, projectId, draftKey, message });
 }
diff --git a/apps/mobile/src/features/threads/DraftThreadHeader.tsx b/apps/mobile/src/features/threads/DraftThreadHeader.tsx
index 5c3d758f45513..6242b62052ffc 100644
--- a/apps/mobile/src/features/threads/DraftThreadHeader.tsx
+++ b/apps/mobile/src/features/threads/DraftThreadHeader.tsx
@@ -15,12 +15,15 @@ import { useEnvironmentScope } from "../../state/session";
 import { useAtomCommand } from "../../state/use-atom-command";
 import { vcsActionManager, vcsEnvironment } from "../../state/vcs";
 import { useVcsActionState } from "../../state/use-vcs-action-state";
+import { scopedThreadKey } from "../../lib/scopedEntities";
+import { useOpenProjectMemory } from "../../components/ProjectKnowledgeEntry";
 import { ThreadHeader } from "./ThreadHeader";
 
 export function DraftThreadHeader(props: {
   readonly thread: EnvironmentThreadShell;
   readonly project: EnvironmentProject;
   readonly cwd: string | null;
+  readonly draftKey: string | null | undefined;
 }) {
   const navigation = useNavigation();
   const { themeVariables } = useAppearancePreferences();
@@ -44,6 +47,12 @@ export function DraftThreadHeader(props: {
       projectName: props.project.title,
     });
   };
+  const openProjectMemory = useOpenProjectMemory(
+    environmentId,
+    props.project.id,
+    // ThreadComposer falls back to the thread's own key the same way.
+    props.draftKey ?? scopedThreadKey(environmentId, props.thread.id),
+  );
   const requiresThread = () =>
     Dialog.alert("Available after the first message", "This action needs a saved thread.");
   return (
@@ -60,6 +69,7 @@ export function DraftThreadHeader(props: {
       onToggleInspector={openFiles}
       onOpenFilesInspector={openFiles}
       onOpenGitInspector={requiresThread}
+      onOpenProjectMemory={openProjectMemory}
       gitControls={{
         environmentId,
         threadId: props.thread.id,
diff --git a/apps/mobile/src/features/threads/NewTaskDraftScreen.tsx b/apps/mobile/src/features/threads/NewTaskDraftScreen.tsx
index a21fcf039aca4..e493a1d84075d 100644
--- a/apps/mobile/src/features/threads/NewTaskDraftScreen.tsx
+++ b/apps/mobile/src/features/threads/NewTaskDraftScreen.tsx
@@ -893,7 +893,12 @@ export function NewTaskDraftScreen(props: {
       <ThreadScreenBinding
         environmentId={selectedProject.environmentId}
         header={
-          <DraftThreadHeader thread={thread} project={selectedProject} cwd={composerWorkspaceCwd} />
+          <DraftThreadHeader
+            thread={thread}
+            project={selectedProject}
+            cwd={composerWorkspaceCwd}
+            draftKey={flow.draftKey}
+          />
         }
         draftMode={{
           content: heroViewport,
diff --git a/apps/mobile/src/features/threads/ThreadHeader.tsx b/apps/mobile/src/features/threads/ThreadHeader.tsx
index 18f719e375e6f..b28708dededc1 100644
--- a/apps/mobile/src/features/threads/ThreadHeader.tsx
+++ b/apps/mobile/src/features/threads/ThreadHeader.tsx
@@ -24,6 +24,20 @@ export function ThreadHeader(
     useAdaptiveWorkspaceLayout();
   const { onOpenTerminal, onMergeBack } = props.gitControls;
   const native = useThreadHeaderOptions(props);
+  const threadActions = [
+    ...(props.onOpenConversationSummaries
+      ? [
+          {
+            id: "conversation-summaries",
+            title: "Conversation summaries",
+            onPress: props.onOpenConversationSummaries,
+          },
+        ]
+      : []),
+    ...(props.onOpenProjectMemory
+      ? [{ id: "project-memory", title: "Project memory", onPress: props.onOpenProjectMemory }]
+      : []),
+  ];
   const androidHeaderActions = useMemo<ReadonlyArray<AppBarAction>>(() => {
     const actions: AppBarAction[] = [];
     if (props.onReturnToThread) {
@@ -80,20 +94,8 @@ export function ThreadHeader(
     <>
       <AppBar
         menus={
-          props.onOpenConversationSummaries
-            ? [
-                {
-                  title: "Thread actions",
-                  icon: "ellipsis",
-                  items: [
-                    {
-                      id: "conversation-summaries",
-                      title: "Conversation summaries",
-                      onPress: props.onOpenConversationSummaries,
-                    },
-                  ],
-                },
-              ]
+          threadActions.length > 0
+            ? [{ title: "Thread actions", icon: "ellipsis", items: threadActions }]
             : undefined
         }
         title={props.title}
diff --git a/apps/mobile/src/features/threads/ThreadRouteScreen.tsx b/apps/mobile/src/features/threads/ThreadRouteScreen.tsx
index 204fbe8e9aaee..1a519b2d482c4 100644
--- a/apps/mobile/src/features/threads/ThreadRouteScreen.tsx
+++ b/apps/mobile/src/features/threads/ThreadRouteScreen.tsx
@@ -1,4 +1,5 @@
 import * as Dialog from "../../components/ui/Dialog";
+import { requestProjectMemory } from "../../components/ProjectKnowledgeEntry";
 import { useRememberThreadProject } from "./useRememberThreadProject";
 import { useOpenPullRequest } from "../../native/useOpenPullRequest";
 import { makeTurnCommandMetadata } from "../../lib/commandMetadata";
@@ -428,6 +429,17 @@ function ThreadRouteContent(
       threadId: summaryThreadId,
     });
   }, [navigation, summaryEnvironmentId, summaryProjectId, summaryThreadId]);
+  const memoryDraftKey = composer.composerDraftKey;
+  const openProjectMemory = useCallback(() => {
+    if (!summaryEnvironmentId || !summaryProjectId || !summaryThreadId) return;
+    requestProjectMemory({
+      environmentId: summaryEnvironmentId,
+      projectId: summaryProjectId,
+      // ThreadComposer falls back to the thread's own key the same way.
+      draftKey: memoryDraftKey ?? scopedThreadKey(summaryEnvironmentId, summaryThreadId),
+      message: null,
+    });
+  }, [summaryEnvironmentId, summaryProjectId, summaryThreadId, memoryDraftKey]);
   const selectDetail = useSelectWorkspaceDetail();
   const openPullRequest = useOpenPullRequest();
   const mergeBack = useAtomCommand(threadEnvironment.mergeBack, "merge thread back");
@@ -994,6 +1006,11 @@ function ThreadRouteContent(
                     ? openConversationSummaries
                     : undefined
                 }
+                onOpenProjectMemory={
+                  serverConfig?.environment.capabilities.projectKnowledge === true
+                    ? openProjectMemory
+                    : undefined
+                }
                 title={selectedThread.title}
                 subtitle={headerSubtitle}
                 headerColor={headerColor}
diff --git a/apps/mobile/src/features/threads/useThreadHeaderOptions.tsx b/apps/mobile/src/features/threads/useThreadHeaderOptions.tsx
index e437966ae38be..324f398178ff4 100644
--- a/apps/mobile/src/features/threads/useThreadHeaderOptions.tsx
+++ b/apps/mobile/src/features/threads/useThreadHeaderOptions.tsx
@@ -24,6 +24,7 @@ export function useThreadHeaderOptions(props: {
   readonly gitControls: Parameters<typeof ThreadGitControls>[0];
   readonly onReturnToThread?: () => void;
   readonly onOpenConversationSummaries?: () => void;
+  readonly onOpenProjectMemory?: () => void;
   readonly draft?: boolean;
 }) {
   const usesNativeWorkspaceColumns = useNativeWorkspaceColumnsSupported();
@@ -71,42 +72,52 @@ export function useThreadHeaderOptions(props: {
     ],
     [sidebarHeaderItem, props.onReturnToThread, props.draft, startNewTask, usesDuoHeader],
   );
-  const summariesHeaderItems = useMemo<NativeHeaderItems>(
-    () =>
-      props.onOpenConversationSummaries
+  const threadActionsHeaderItems = useMemo<NativeHeaderItems>(() => {
+    const items = [
+      ...(props.onOpenConversationSummaries
         ? [
-            withNativeGlassHeaderItem({
-              type: "menu" as const,
-              identifier: "thread-conversation-summaries",
-              accessibilityLabel: "Thread actions",
-              icon: { name: "ellipsis", type: "sfSymbol" as const },
-              menu: {
-                items: [
-                  {
-                    type: "action" as const,
-                    label: "Conversation summaries",
-                    onPress: props.onOpenConversationSummaries,
-                  },
-                ],
-              },
-            }),
+            {
+              type: "action" as const,
+              label: "Conversation summaries",
+              onPress: props.onOpenConversationSummaries,
+            },
           ]
-        : [],
-    [props.onOpenConversationSummaries],
-  );
+        : []),
+      ...(props.onOpenProjectMemory
+        ? [
+            {
+              type: "action" as const,
+              label: "Project memory",
+              onPress: props.onOpenProjectMemory,
+            },
+          ]
+        : []),
+    ];
+    return items.length > 0
+      ? [
+          withNativeGlassHeaderItem({
+            type: "menu" as const,
+            identifier: "thread-conversation-summaries",
+            accessibilityLabel: "Thread actions",
+            icon: { name: "ellipsis", type: "sfSymbol" as const },
+            menu: { items },
+          }),
+        ]
+      : [];
+  }, [props.onOpenConversationSummaries, props.onOpenProjectMemory]);
   const rightHeaderItems = useMemo<NativeHeaderItems>(
     () => [
       ...(usesDuoHeader || layout.usesSplitView
         ? threadCenterHeaderItems
         : compactRightHeaderItems),
-      ...summariesHeaderItems,
+      ...threadActionsHeaderItems,
     ],
     [
       usesDuoHeader,
       layout.usesSplitView,
       threadCenterHeaderItems,
       compactRightHeaderItems,
-      summariesHeaderItems,
+      threadActionsHeaderItems,
     ],
   );
   const canGoBack = navigation.canGoBack();
@@ -142,7 +153,7 @@ export function useThreadHeaderOptions(props: {
     // Factories re-read only on version changes; include displayed items and hidden callback state such as default refs.
     optionsVersion: [
       splitLeftHeaderItems,
-      summariesHeaderItems,
+      threadActionsHeaderItems,
       threadCenterHeaderItems,
       compactRightHeaderItems,
       usesDuoHeader,
diff --git a/apps/web/src/components/chat/ThreadDetailsPanel.tsx b/apps/web/src/components/chat/ThreadDetailsPanel.tsx
index 393c4b1c80483..091e555b43367 100644
--- a/apps/web/src/components/chat/ThreadDetailsPanel.tsx
+++ b/apps/web/src/components/chat/ThreadDetailsPanel.tsx
@@ -152,6 +152,7 @@ export function ThreadDetailsPanel(props: ThreadDetailsPanelProps) {
           environment: density === "full" && visible.environment,
           openIn: density !== "essential" && visible.openIn && props.showOpenInPicker,
           scripts: visible.scripts && props.activeProjectScripts !== undefined,
+          memory: visible.memory,
           branch: props.gitCwd !== null && props.isGitRepo && visible.branch,
           git:
             props.gitCwd !== null &&
@@ -162,7 +163,7 @@ export function ThreadDetailsPanel(props: ThreadDetailsPanelProps) {
         return (
           <>
             <div className="group/details-items">
-              {show.environment || show.openIn || show.scripts || showIndexRows ? (
+              {show.environment || show.openIn || show.scripts || show.memory || showIndexRows ? (
                 <ThreadDetailsSection
                   headingId="thread-details-workspace-heading"
                   title="Workspace"
@@ -224,6 +225,13 @@ export function ThreadDetailsPanel(props: ThreadDetailsPanelProps) {
                         threadId={props.threadId}
                       />
                     ) : null}
+
+                    {show.memory ? (
+                      <ProjectMemoryPanel
+                        environmentId={props.environmentId}
+                        projectId={props.projectId}
+                      />
+                    ) : null}
                   </div>
                 </ThreadDetailsSection>
               ) : null}
@@ -254,8 +262,6 @@ export function ThreadDetailsPanel(props: ThreadDetailsPanelProps) {
                 </ThreadDetailsSection>
               ) : null}
 
-              <ProjectMemoryPanel environmentId={props.environmentId} projectId={props.projectId} />
-
               {density === "full" && !props.draftId && visible.servers ? (
                 <ThreadServersPanel environmentId={props.environmentId} threadId={props.threadId} />
               ) : null}
diff --git a/apps/web/src/components/chat/threadDetailsItems.ts b/apps/web/src/components/chat/threadDetailsItems.ts
index 7502a4c0b1dce..8d4cdbaf17166 100644
--- a/apps/web/src/components/chat/threadDetailsItems.ts
+++ b/apps/web/src/components/chat/threadDetailsItems.ts
@@ -5,6 +5,7 @@ export const THREAD_DETAILS_ITEMS = [
   { id: "environment", label: "Environment and worktree", defaultVisible: true },
   { id: "openIn", label: "Open in editor", defaultVisible: true },
   { id: "scripts", label: "Project scripts", defaultVisible: true },
+  { id: "memory", label: "Project memory", defaultVisible: true },
   { id: "branch", label: "Branch and pull request", defaultVisible: true },
   { id: "gitActions", label: "Git actions", defaultVisible: true },
   { id: "changes", label: "Changes", defaultVisible: true },
diff --git a/apps/web/src/components/projectKnowledge/ProjectMemoryPanel.tsx b/apps/web/src/components/projectKnowledge/ProjectMemoryPanel.tsx
index 511ff73fe0132..3419a9a9b2b58 100644
--- a/apps/web/src/components/projectKnowledge/ProjectMemoryPanel.tsx
+++ b/apps/web/src/components/projectKnowledge/ProjectMemoryPanel.tsx
@@ -22,7 +22,13 @@ import {
 import { projectKnowledgeContextRecord } from "@t3tools/client-runtime/projectKnowledge";
 import { scopedThreadKey } from "@t3tools/client-runtime/environment";
 import { squashAtomCommandFailure } from "@t3tools/client-runtime/state/runtime";
+import { BrainIcon } from "lucide-react";
 import { Button } from "../ui/button";
+import { ThreadDetailsControl } from "../chat/ThreadDetailsControl";
+import {
+  THREAD_DETAILS_PANEL_ICON_CLASS,
+  THREAD_DETAILS_PANEL_LABEL_CLASS,
+} from "../chat/threadDetailsPanelStyles";
 import { Checkbox } from "../ui/checkbox";
 import { Input } from "../ui/input";
 import { ScrollArea } from "../ui/scroll-area";
@@ -120,15 +126,19 @@ export function ProjectMemoryPanel(props: ProjectScope) {
   const open = useOpenProjectMemory();
   if (!available) return null;
   return (
-    <Button variant="ghost" size="sm" onClick={() => open(props)}>
-      Project memory
-    </Button>
+    <ThreadDetailsControl onClick={() => open(props)}>
+      <BrainIcon aria-hidden className={THREAD_DETAILS_PANEL_ICON_CLASS} />
+      <span className={`min-w-0 flex-1 truncate ${THREAD_DETAILS_PANEL_LABEL_CLASS}`}>
+        Project memory
+      </span>
+    </ThreadDetailsControl>
   );
 }
 
 export function ProjectMemoryDialogHost(props: Scope) {
   const available = useProjectMemoryAvailable(props.environmentId);
   const [request, setRequest] = useAtom(openRequestAtom);
+  // oxlint-disable-next-line t3code/no-unreasoned-state-sync -- releases the shared open request this host holds until unmount
   useEffect(() => () => setRequest(null), [setRequest]);
   const active =
     available &&
@@ -226,6 +236,7 @@ function MemoryContents(
   } | null>(null);
   const rootRef = useRef<HTMLDivElement>(null);
   const selectionVersion = useRef(0);
+  // oxlint-disable-next-line t3code/no-unreasoned-state-sync -- invalidates in-flight selection work when the dialog unmounts
   useEffect(
     () => () => {
       selectionVersion.current += 1;