diff --git a/.changeset/preserve-background-agent-dismissals.md b/.changeset/preserve-background-agent-dismissals.md
new file mode 100644
index 00000000000..01f1a7816e8
--- /dev/null
+++ b/.changeset/preserve-background-agent-dismissals.md
@@ -0,0 +1,5 @@
+---
+"kilo-code": patch
+---
+
+Keep dismissed background agents hidden when switching sessions or returning from History and empty chats.
diff --git a/packages/kilo-vscode/webview-ui/src/components/chat/BackgroundAgents.tsx b/packages/kilo-vscode/webview-ui/src/components/chat/BackgroundAgents.tsx
index d5612e066d2..e724587af6e 100644
--- a/packages/kilo-vscode/webview-ui/src/components/chat/BackgroundAgents.tsx
+++ b/packages/kilo-vscode/webview-ui/src/components/chat/BackgroundAgents.tsx
@@ -36,14 +36,12 @@ export const BackgroundAgents: Component<{ readonly?: boolean }> = (props) => {
   const [open, setOpen] = createSignal(false)
   const [jobs, setJobs] = createSignal<BackgroundJobInfo[]>([])
   const [loaded, setLoaded] = createSignal(false)
-  const [hidden, setHidden] = createSignal<Set<string>>(new Set())
   const [mounted, setMounted] = createSignal(false)
   let pending: string | undefined
   let revision = 0
 
   createEffect(
     on(session.currentSessionID, () => {
-      setHidden(new Set<string>())
       setLoaded(false)
       setJobs([])
       pending = undefined
@@ -95,7 +93,12 @@ export const BackgroundAgents: Component<{ readonly?: boolean }> = (props) => {
     return fallback()
   })
 
-  const visible = createMemo(() => agents().filter((agent) => showBackgroundAgent(agent, hidden())))
+  const visible = createMemo(() => {
+    const id = session.currentSessionID()
+    if (!id) return []
+    const hidden = session.dismissedBackgroundJobs(id)
+    return agents().filter((agent) => showBackgroundAgent(agent, hidden))
+  })
   const summary = createMemo(() => {
     const running = visible().filter((agent) => agent.status === "running").length
     const total = visible().length
@@ -174,13 +177,16 @@ export const BackgroundAgents: Component<{ readonly?: boolean }> = (props) => {
     vscode.postMessage({ type: "cancelBackgroundJob", jobID: agent.jobID, sessionID: id, requestID: pending })
   }
 
+  const hide = (ids: string[]) => {
+    const id = session.currentSessionID()
+    if (id) session.dismissBackgroundJobs(id, ids)
+  }
+
   const hideFinished = () =>
-    setHidden(
-      new Set(
-        agents()
-          .filter((agent) => agent.status !== "running")
-          .map((agent) => agent.jobID),
-      ),
+    hide(
+      agents()
+        .filter((agent) => agent.status !== "running")
+        .map((agent) => agent.jobID),
     )
 
   return (
@@ -334,7 +340,7 @@ export const BackgroundAgents: Component<{ readonly?: boolean }> = (props) => {
                       aria-label={`${language.t("task.backgroundAgents.dismiss")}: ${label(agent)}`}
                       onClick={(event: MouseEvent) => {
                         event.stopPropagation()
-                        setHidden((current) => new Set(current).add(agent.jobID))
+                        hide([agent.jobID])
                       }}
                     >
                       <span data-slot="task-header-agent-action-label">
diff --git a/packages/kilo-vscode/webview-ui/src/context/session-types.ts b/packages/kilo-vscode/webview-ui/src/context/session-types.ts
index 9bc29fb394b..3e4995480fb 100644
--- a/packages/kilo-vscode/webview-ui/src/context/session-types.ts
+++ b/packages/kilo-vscode/webview-ui/src/context/session-types.ts
@@ -75,6 +75,8 @@ export interface SessionContextValue {
   // Tool parts for a specific session, maintained incrementally for streaming views
   getSessionToolParts: (sessionID: string) => ToolPart[]
   getSessionToolCount: (sessionID: string) => number
+  dismissedBackgroundJobs: (sessionID: string) => ReadonlySet<string>
+  dismissBackgroundJobs: (sessionID: string, ids: string[]) => void
 
   // Hidden after model changes so switching models can clear stale provider errors
   // without removing messages and their checkpoint restore actions.
diff --git a/packages/kilo-vscode/webview-ui/src/context/session.tsx b/packages/kilo-vscode/webview-ui/src/context/session.tsx
index ffb64fe6e5e..ff5cff12291 100644
--- a/packages/kilo-vscode/webview-ui/src/context/session.tsx
+++ b/packages/kilo-vscode/webview-ui/src/context/session.tsx
@@ -283,6 +283,12 @@ export const SessionProvider: ParentComponent = (props) => {
   // Cloud session preview state
   const [cloudPreviewId, setCloudPreviewId] = createSignal<string | null>(null)
   const [hiddenErrors, setHiddenErrors] = createSignal<Set<string>>(new Set())
+  const [dismissals, setDismissals] = createStore<Record<string, ReadonlySet<string>>>({})
+  const dismissedBackgroundJobs = (id: string): ReadonlySet<string> => dismissals[id] ?? new Set<string>()
+  const dismissBackgroundJobs = (id: string, ids: string[]) => {
+    if (!ids.length) return
+    setDismissals(id, (current) => new Set([...(current ?? []), ...ids]))
+  }
 
   // Live worktree diff stats from extension polling
   const [worktreeStats, setWorktreeStats] = createSignal<
@@ -978,6 +984,11 @@ export const SessionProvider: ParentComponent = (props) => {
 
       case "sessionDeleted":
         handleSessionDeleted(message.sessionID)
+        setDismissals(
+          produce((map) => {
+            delete map[message.sessionID]
+          }),
+        )
         break
 
       case "messageRemoved":
@@ -2879,6 +2890,8 @@ export const SessionProvider: ParentComponent = (props) => {
     getParts,
     getSessionToolParts,
     getSessionToolCount,
+    dismissedBackgroundJobs,
+    dismissBackgroundJobs,
     isErrorHidden: (messageID: string) => hiddenErrors().has(messageID),
     hydrateParts,
     todos,
diff --git a/packages/kilo-vscode/webview-ui/src/stories/StoryProviders.tsx b/packages/kilo-vscode/webview-ui/src/stories/StoryProviders.tsx
index 4723242ee45..aec116a739c 100644
--- a/packages/kilo-vscode/webview-ui/src/stories/StoryProviders.tsx
+++ b/packages/kilo-vscode/webview-ui/src/stories/StoryProviders.tsx
@@ -217,6 +217,8 @@ export function mockSessionValue(overrides?: {
     getParts: () => [],
     getSessionToolParts: () => [],
     getSessionToolCount: () => 0,
+    dismissedBackgroundJobs: () => new Set<string>(),
+    dismissBackgroundJobs: noop,
     isErrorHidden: () => false,
     hydrateParts: noop,
     todos: () => [],