diff --git a/packages/app/src/home/projects/view.tsx b/packages/app/src/home/projects/view.tsx
index 7e18665986..51ca80b501 100644
--- a/packages/app/src/home/projects/view.tsx
+++ b/packages/app/src/home/projects/view.tsx
@@ -196,6 +196,7 @@ function HomeServerRow(props: {
   health: ServerHealth | undefined
 }) {
   const healthy = () => !!props.health?.healthy
+  const incompatible = () => !!props.health?.incompatible
   const canToggle = () => healthy() && props.projectsForServer(props.server).length > 0
   const contextMenuID = () => serverContextMenuID(props.server)
   onCleanup(() => {
@@ -203,96 +204,107 @@ function HomeServerRow(props: {
     if (props.contextMenuOpen(id)) props.onSetContextMenuOpen(id, false)
   })
   return (
-    <div class="group/server relative flex h-7 min-w-0 items-center rounded-[6px]">
+    <Tooltip
+      appearance="standard"
+      placement="top"
+      class="flex h-7 w-full min-w-0"
+      inactive={!incompatible()}
+      value={props.language.t("server.row.incompatible", { version: props.health?.version ?? "1" })}
+    >
+      <div class="group/server relative flex h-7 w-full min-w-0 items-center rounded-[6px]">
       <HomeProjectNavButton
         type="button"
-        class="pr-16 disabled:opacity-60"
+        class="pr-16"
+        classList={{ "opacity-60": !healthy() && !incompatible() }}
         data-selected={props.selected ? "" : undefined}
-        disabled={!healthy()}
-        onClick={() => props.onFocusServer(props.server)}
-      >
-        <span
-          data-action="home-server-collapse"
-          class={`
+          disabled={!healthy()}
+          onClick={() => props.onFocusServer(props.server)}
+        >
+          <span
+            data-action="home-server-collapse"
+            class={`
             -ml-0.5 -mr-1.5 inline-flex size-5 shrink-0 items-center justify-center
             rounded-[4px] text-v2-icon-icon-muted
           `}
-          classList={{
-            "hover:bg-v2-overlay-simple-overlay-hover": canToggle(),
-            "cursor-default opacity-40": !canToggle(),
-          }}
-          aria-label={
-            props.collapsed ? props.language.t("home.server.expand") : props.language.t("home.server.collapse")
-          }
-          aria-disabled={!canToggle()}
-          aria-expanded={canToggle() ? !props.collapsed : undefined}
-          onClick={(event) => {
-            event.preventDefault()
-            event.stopPropagation()
-            if (!canToggle()) return
-            props.onToggleCollapsed(props.server)
-          }}
-          onPointerDown={(event) => event.preventDefault()}
-        >
-          <Icon
-            name="chevron-down"
-            size="small"
-            class="transition-transform duration-150 ease-in-out"
-            style={{ transform: `rotate(${props.collapsed ? -90 : 0}deg)` }}
-          />
-        </span>
-        <div class="flex size-4 shrink-0 items-center justify-center -mr-0.5">
-          <ServerHealthIndicator health={props.health} />
-        </div>
-        <span class="flex min-w-0 items-center gap-1">
-          <span class={HOME_PROJECT_NAV_LABEL}>{props.server.displayName ?? new URL(props.server.http.url).host}</span>
-          <Show when={props.server.label}>
-            {(label) => (
-              <span
-                class={`
+            classList={{
+              "hover:bg-v2-overlay-simple-overlay-hover": canToggle(),
+              "cursor-default opacity-40": !canToggle(),
+            }}
+            aria-label={
+              props.collapsed ? props.language.t("home.server.expand") : props.language.t("home.server.collapse")
+            }
+            aria-disabled={!canToggle()}
+            aria-expanded={canToggle() ? !props.collapsed : undefined}
+            onClick={(event) => {
+              event.preventDefault()
+              event.stopPropagation()
+              if (!canToggle()) return
+              props.onToggleCollapsed(props.server)
+            }}
+            onPointerDown={(event) => event.preventDefault()}
+          >
+            <Icon
+              name="chevron-down"
+              size="small"
+              class="transition-transform duration-150 ease-in-out"
+              style={{ transform: `rotate(${props.collapsed || !canToggle() ? -90 : 0}deg)` }}
+            />
+          </span>
+          <div class="flex size-4 shrink-0 items-center justify-center -mr-0.5">
+            <ServerHealthIndicator health={props.health} />
+          </div>
+          <span class="flex min-w-0 items-center gap-1">
+            <span class={HOME_PROJECT_NAV_LABEL}>
+              {props.server.displayName ?? new URL(props.server.http.url).host}
+            </span>
+            <Show when={props.server.label}>
+              {(label) => (
+                <span
+                  class={`
                   shrink-0 rounded-[3px] border border-v2-border-border-base px-1 py-0.5
                   text-[9px] leading-none text-v2-text-text-muted
                 `}
-              >
-                {label()}
-              </span>
-            )}
-          </Show>
-        </span>
-      </HomeProjectNavButton>
-      <div
-        class={`
+                >
+                  {label()}
+                </span>
+              )}
+            </Show>
+          </span>
+        </HomeProjectNavButton>
+        <div
+          class={`
           hover-reveal absolute right-1 top-1/2 flex -translate-y-1/2 items-center gap-1
           group-hover/server:opacity-100 focus-within:opacity-100 data-[menu=true]:opacity-100
         `}
-        data-menu={props.contextMenuOpen(contextMenuID())}
-      >
-        <ServerRowMenuView
-          server={props.server}
-          labels={serverMenuLabels(props.language)}
-          canDefault={props.canDefaultServer}
-          isDefault={props.defaultServerKey === ServerConnection.key(props.server)}
-          canRemove={props.canRemoveServer(props.server)}
-          onEdit={props.onEditServer}
-          onSetDefault={() => props.onSetDefaultServer(props.server)}
-          onRemoveDefault={() => props.onSetDefaultServer(undefined)}
-          onRemove={() => props.onRemoveServer(props.server)}
-          open={props.contextMenuOpen(contextMenuID())}
-          onOpenChange={(open) => props.onSetContextMenuOpen(contextMenuID(), open)}
-        />
-        <Tooltip class="flex shrink-0 items-center" placement="bottom" value={props.language.t("home.project.add")}>
-          <IconButton
-            data-action="home-add-project"
-            variant="ghost-muted"
-            size="small"
-            icon={<Icon name="folder-add-left" />}
-            aria-label={props.language.t("home.project.add")}
-            disabled={props.health?.healthy === false}
-            onClick={() => props.onChooseProject(props.server)}
+          data-menu={props.contextMenuOpen(contextMenuID())}
+        >
+          <ServerRowMenuView
+            server={props.server}
+            labels={serverMenuLabels(props.language)}
+            canDefault={props.canDefaultServer}
+            isDefault={props.defaultServerKey === ServerConnection.key(props.server)}
+            canRemove={props.canRemoveServer(props.server)}
+            onEdit={props.onEditServer}
+            onSetDefault={() => props.onSetDefaultServer(props.server)}
+            onRemoveDefault={() => props.onSetDefaultServer(undefined)}
+            onRemove={() => props.onRemoveServer(props.server)}
+            open={props.contextMenuOpen(contextMenuID())}
+            onOpenChange={(open) => props.onSetContextMenuOpen(contextMenuID(), open)}
           />
-        </Tooltip>
+          <Tooltip class="flex shrink-0 items-center" placement="bottom" value={props.language.t("home.project.add")}>
+            <IconButton
+              data-action="home-add-project"
+              variant="ghost-muted"
+              size="small"
+              icon={<Icon name="folder-add-left" />}
+              aria-label={props.language.t("home.project.add")}
+              disabled={props.health?.healthy === false}
+              onClick={() => props.onChooseProject(props.server)}
+            />
+          </Tooltip>
+        </div>
       </div>
-    </div>
+    </Tooltip>
   )
 }
 
diff --git a/packages/app/src/new-session/route.tsx b/packages/app/src/new-session/route.tsx
index 0bdf6d4f64..1b4592cd82 100644
--- a/packages/app/src/new-session/route.tsx
+++ b/packages/app/src/new-session/route.tsx
@@ -6,11 +6,13 @@ import { useGlobal } from "@/runtime/server/runtime"
 import { LocationProvider } from "@/workspaces/location"
 import { ModelsProvider } from "@/providers/models/models"
 import { ComposerPersistenceProvider } from "@/composer/persistence"
-import { ServerProvider } from "@/runtime/server/current"
+import { ServerProvider, useServer } from "@/runtime/server/current"
 import { ServerConnection } from "@/runtime/server/registry"
 import { useTabs, type DraftTab } from "@/shell/tabs/tabs"
 import { SessionUIProvider } from "@/shell/routes/session-ui-provider"
 import NewSession from "@/new-session/screen"
+import { IncompatibleServerPanel } from "@/session/incompatible-server-panel"
+import { SessionPanelFrame, SessionRouteFrame } from "@/session/session-frame"
 
 export function DraftRoute() {
   const [search] = useSearchParams<{ draftId?: string }>()
@@ -35,15 +37,7 @@ function ResolvedDraftRoute(props: { draft: DraftTab }) {
       <Show when={conn()} keyed>
         {(conn) => (
           <ServerProvider conn={conn}>
-            <ModelsProvider directory={props.draft.directory}>
-              <LocationProvider directory={props.draft.directory}>
-                <SessionUIProvider directory={props.draft.directory} server={props.draft.server}>
-                  <DraftProviders>
-                    <NewSession draftId={props.draft.draftID} />
-                  </DraftProviders>
-                </SessionUIProvider>
-              </LocationProvider>
-            </ModelsProvider>
+            <ResolvedDraftContent draft={props.draft} />
           </ServerProvider>
         )}
       </Show>
@@ -51,6 +45,39 @@ function ResolvedDraftRoute(props: { draft: DraftTab }) {
   )
 }
 
+function ResolvedDraftContent(props: { draft: DraftTab }) {
+  const server = useServer()
+  const tabs = useTabs()
+
+  return (
+    <Show
+      when={!server.health?.incompatible}
+      fallback={
+        <SessionRouteFrame padded>
+          <SessionPanelFrame raised>
+            <IncompatibleServerPanel
+              onClose={() => {
+                const index = tabs.store.findIndex((tab) => tab.type === "draft" && tab.draftID === props.draft.draftID)
+                if (index !== -1) tabs.closeTab(index)
+              }}
+            />
+          </SessionPanelFrame>
+        </SessionRouteFrame>
+      }
+    >
+      <ModelsProvider directory={props.draft.directory}>
+        <LocationProvider directory={props.draft.directory}>
+          <SessionUIProvider directory={props.draft.directory} server={props.draft.server}>
+            <DraftProviders>
+              <NewSession draftId={props.draft.draftID} />
+            </DraftProviders>
+          </SessionUIProvider>
+        </LocationProvider>
+      </ModelsProvider>
+    </Show>
+  )
+}
+
 // The draft page only renders the prompt composer, so it drops TerminalProvider.
 // FileProvider and CommentsProvider stay because Composer uses file search and comment context.
 function DraftProviders(props: ParentProps) {
diff --git a/packages/app/src/runtime/i18n/en.ts b/packages/app/src/runtime/i18n/en.ts
index cd9b9b7390..7bf558c786 100644
--- a/packages/app/src/runtime/i18n/en.ts
+++ b/packages/app/src/runtime/i18n/en.ts
@@ -444,6 +444,8 @@ export const dict = {
   "wsl.onboarding.adding": "Adding...",
 
   "server.row.noUsername": "no username",
+  "server.row.incompatible":
+    "This server is running OpenCode {{version}}, which isn't compatible with this app. Upgrade it to OpenCode V2 to continue.",
 
   "dialog.project.edit.title": "Edit project",
   "dialog.project.edit.name": "Name",
@@ -650,6 +652,9 @@ export const dict = {
   "session.error.notFound": "This session cannot be found",
   "session.error.notFound.description": "This tab points to a session that no longer exists on this server.",
   "session.error.notFound.closeTab": "Close Tab",
+  "session.error.incompatible": "This server version isn't supported",
+  "session.error.incompatible.description":
+    "{{server}} is running OpenCode {{version}}, which isn't compatible with this app. Upgrade the server to OpenCode V2 to continue.",
   "session.background.moveTasks": "Move {{tasks}} to background",
   "session.background.inBackground": "Running {{tasks}} in background",
   "session.background.combine": "{{first}} and {{second}}",
diff --git a/packages/app/src/runtime/server/health.test.ts b/packages/app/src/runtime/server/health.test.ts
index 16bbd1d741..48ff46625d 100644
--- a/packages/app/src/runtime/server/health.test.ts
+++ b/packages/app/src/runtime/server/health.test.ts
@@ -29,6 +29,23 @@ describe("checkServerHealth", () => {
     expect(request?.pathname).toBe("/api/health")
   })
 
+  test("identifies a V1 server without a version as incompatible", async () => {
+    const requests: string[] = []
+    const fetch = (async (input: RequestInfo | URL) => {
+      const url = input instanceof URL ? input : new URL(input instanceof Request ? input.url : input)
+      requests.push(url.pathname)
+      return new Response(JSON.stringify(url.pathname === "/global/health" ? { version: "1.18.15" } : { healthy: true }), {
+        status: 200,
+        headers: { "content-type": "application/json" },
+      })
+    }) as unknown as typeof globalThis.fetch
+
+    const result = await checkServerHealth(server, fetch)
+
+    expect(result).toEqual({ healthy: false, version: "1.18.15", incompatible: true })
+    expect(requests).toEqual(["/api/health", "/global/health"])
+  })
+
   test("allows slow servers thirty seconds by default", async () => {
     const timeout = Object.getOwnPropertyDescriptor(AbortSignal, "timeout")
     let timeoutMs = 0
diff --git a/packages/app/src/runtime/server/health.ts b/packages/app/src/runtime/server/health.ts
index 740de5f4cd..a381fadf00 100644
--- a/packages/app/src/runtime/server/health.ts
+++ b/packages/app/src/runtime/server/health.ts
@@ -5,7 +5,7 @@ import { ClientError, OpenCode } from "@opencode-ai/client"
 import { Accessor, createEffect, onCleanup } from "solid-js"
 import { createStore, reconcile } from "solid-js/store"
 
-export type ServerHealth = { healthy: boolean; version?: string }
+export type ServerHealth = { healthy: boolean; version?: string; incompatible?: boolean }
 
 interface CheckServerHealthOptions {
   timeoutMs?: number
@@ -78,6 +78,11 @@ export async function checkServerHealth(
   const signal = opts?.signal ?? timeout?.signal
   const retryCount = opts?.retryCount ?? defaultRetryCount
   const retryDelayMs = opts?.retryDelayMs ?? defaultRetryDelayMs
+  const headers = server.password
+    ? {
+        Authorization: `Basic ${authTokenFromCredentials({ username: server.username, password: server.password })}`,
+      }
+    : undefined
   const next = (count: number, error: unknown) => {
     if (count >= retryCount || !retryable(error, signal)) return Promise.resolve({ healthy: false } as const)
     return wait(retryDelayMs * (count + 1), signal)
@@ -88,18 +93,23 @@ export async function checkServerHealth(
     const current = await OpenCode.make({
       baseUrl: server.url,
       fetch,
-      headers: server.password
-        ? {
-            Authorization: `Basic ${authTokenFromCredentials({ username: server.username, password: server.password })}`,
-          }
-        : undefined,
+      headers,
     })
       .health.get({ signal })
-      .then((x) =>
-        typeof x.healthy === "boolean"
-          ? { data: { healthy: x.healthy, version: x.version } }
-          : { error: new Error("Invalid health response") },
-      )
+      .then(async (x) => {
+        if (typeof x.healthy !== "boolean") return { error: new Error("Invalid health response") }
+        if (x.healthy && typeof x.version !== "string") {
+          const legacy = await fetch(new URL("/global/health", server.url), { headers, signal })
+            .then((response) => response.json())
+            .catch(() => undefined)
+          const version =
+            typeof legacy === "object" && legacy !== null && "version" in legacy && typeof legacy.version === "string"
+              ? legacy.version
+              : "1"
+          return { data: { healthy: false, version, incompatible: true } }
+        }
+        return { data: { healthy: x.healthy, version: x.version } }
+      })
       .catch((error) => ({ error }))
     if ("data" in current && current.data) return current.data
     if (signal?.aborted) return { healthy: false }
diff --git a/packages/app/src/servers/registry/row.tsx b/packages/app/src/servers/registry/row.tsx
index 391f23c38d..d33b631d6c 100644
--- a/packages/app/src/servers/registry/row.tsx
+++ b/packages/app/src/servers/registry/row.tsx
@@ -1,4 +1,5 @@
 import { Tooltip } from "@opencode-ai/ui/tooltip"
+import { Icon } from "@opencode-ai/ui/icon"
 import { createResizeObserver } from "@solid-primitives/resize-observer"
 import {
   children,
@@ -119,13 +120,20 @@ export function ServerRow(props: ServerRowProps) {
 
 export function ServerHealthIndicator(props: { health?: ServerHealth }) {
   return (
-    <div
-      classList={{
-        "size-1.5 rounded-full shrink-0 my-[3.5px]": true,
-        "bg-icon-success-base": props.health?.healthy === true,
-        "bg-icon-critical-base": props.health?.healthy === false,
-        "bg-border-weak-base": props.health === undefined,
-      }}
-    />
+    <Show
+      when={props.health?.incompatible}
+      fallback={
+        <div
+          classList={{
+            "size-1.5 rounded-full shrink-0 my-[3.5px]": true,
+            "bg-icon-success-base": props.health?.healthy === true,
+            "bg-icon-critical-base": props.health?.healthy === false,
+            "bg-border-weak-base": props.health === undefined,
+          }}
+        />
+      }
+    >
+      <Icon name="warning" size="small" class="shrink-0 text-icon-warning-base" />
+    </Show>
   )
 }
diff --git a/packages/app/src/session/incompatible-server-panel.tsx b/packages/app/src/session/incompatible-server-panel.tsx
new file mode 100644
index 0000000000..744470cd45
--- /dev/null
+++ b/packages/app/src/session/incompatible-server-panel.tsx
@@ -0,0 +1,33 @@
+import { Button } from "@opencode-ai/ui/button"
+import { Icon } from "@opencode-ai/ui/icon"
+import { Show } from "solid-js"
+import { useLanguage } from "@/runtime/i18n/language"
+import { useServer } from "@/runtime/server/current"
+import { serverName } from "@/runtime/server/registry"
+
+export function IncompatibleServerPanel(props: { onClose?: () => void }) {
+  const language = useLanguage()
+  const server = useServer()
+
+  return (
+    <div class="flex-1 min-h-0 overflow-hidden">
+      <div class="h-full px-6 pb-42 -mt-4 flex flex-col items-center justify-center text-center gap-4">
+        <Icon name="warning" size="large" class="text-icon-warning-base" />
+        <div class="flex flex-col items-center gap-2">
+          <div class="text-16-medium text-text max-w-md">{language.t("session.error.incompatible")}</div>
+          <div class="text-13-regular text-text-weak max-w-md">
+            {language.t("session.error.incompatible.description", {
+              server: serverName(server.conn),
+              version: server.health?.version ?? "1",
+            })}
+          </div>
+        </div>
+        <Show when={props.onClose}>
+          <Button variant="neutral" size="normal" icon="xmark-small" onClick={() => props.onClose?.()}>
+            {language.t("session.error.notFound.closeTab")}
+          </Button>
+        </Show>
+      </div>
+    </div>
+  )
+}
diff --git a/packages/app/src/session/route-error.tsx b/packages/app/src/session/route-error.tsx
index 14c94d3efe..526a112ce6 100644
--- a/packages/app/src/session/route-error.tsx
+++ b/packages/app/src/session/route-error.tsx
@@ -2,51 +2,68 @@ import { Button } from "@opencode-ai/ui/button"
 import { createMemo, Show } from "solid-js"
 import { ErrorPage } from "@/shell/errors/error"
 import { useLanguage } from "@/runtime/i18n/language"
+import { useServer } from "@/runtime/server/current"
 import { ServerConnection, serverName, useServers } from "@/runtime/server/registry"
 import { useTabs } from "@/shell/tabs/tabs"
 import { isLocalSessionNotFoundError, isSessionNotFoundError } from "@/runtime/server/errors"
+import { IncompatibleServerPanel } from "./incompatible-server-panel"
 
 export function SessionErrorFallback(props: { error: unknown; sessionID?: string; serverKey?: ServerConnection.Key }) {
   const language = useLanguage()
+  const activeServer = useServer()
   const server = useServers()
   const tabs = useTabs()
   const displayServer = createMemo(() => {
     const conn = server.list.find((item) => ServerConnection.key(item) === props.serverKey)
     return conn ? serverName(conn) : props.serverKey
   })
-
-  if (!isCurrentSessionNotFoundError(props.error, props.sessionID)) return <ErrorPage error={props.error} />
+  const closeSession = () => {
+    if (!props.sessionID) return
+    tabs.removeSessionTab({ server: activeServer.key, sessionId: props.sessionID })
+  }
 
   return (
-    <div class="flex-1 min-h-0 overflow-hidden">
-      <div class="h-full px-6 pb-42 -mt-4 flex flex-col items-center justify-center text-center gap-4">
-        <div class="flex flex-col items-center gap-2">
-          <div class="text-16-medium text-text max-w-md">{language.t("session.error.notFound")}</div>
-          <div class="text-13-regular text-text-weak max-w-md">{language.t("session.error.notFound.description")}</div>
-        </div>
-        <Show when={props.sessionID}>
-          {(sessionID) => (
-            <div class="max-w-full flex flex-col items-center gap-1">
-              <div class="max-w-full text-11-regular text-text-faint break-all">{displayServer()}</div>
-              <code class="max-w-full rounded-[4px] px-1 py-0.5 font-mono text-xs font-medium leading-4 text-text-base break-all bg-[color-mix(in_oklch,var(--v2-text-text-base)_8%,transparent)]">
-                {sessionID()}
-              </code>
+    <Show
+      when={!activeServer.health?.incompatible}
+      fallback={<IncompatibleServerPanel onClose={props.sessionID ? closeSession : undefined} />}
+    >
+      <Show
+        when={isCurrentSessionNotFoundError(props.error, props.sessionID)}
+        fallback={<ErrorPage error={props.error} />}
+      >
+        <div class="flex-1 min-h-0 overflow-hidden">
+          <div class="h-full px-6 pb-42 -mt-4 flex flex-col items-center justify-center text-center gap-4">
+            <div class="flex flex-col items-center gap-2">
+              <div class="text-16-medium text-text max-w-md">{language.t("session.error.notFound")}</div>
+              <div class="text-13-regular text-text-weak max-w-md">
+                {language.t("session.error.notFound.description")}
+              </div>
             </div>
-          )}
-        </Show>
-        <Button
-          variant="neutral"
-          size="normal"
-          icon="xmark-small"
-          onClick={() => {
-            if (!props.sessionID || !props.serverKey) return
-            tabs.removeSessionTab({ server: props.serverKey, sessionId: props.sessionID })
-          }}
-        >
-          {language.t("session.error.notFound.closeTab")}
-        </Button>
-      </div>
-    </div>
+            <Show when={props.sessionID}>
+              {(sessionID) => (
+                <div class="max-w-full flex flex-col items-center gap-1">
+                  <div class="max-w-full text-11-regular text-text-faint break-all">{displayServer()}</div>
+                  <code class="max-w-full rounded-[4px] px-1 py-0.5 font-mono text-xs font-medium leading-4 text-text-base break-all bg-[color-mix(in_oklch,var(--v2-text-text-base)_8%,transparent)]">
+                    {sessionID()}
+                  </code>
+                </div>
+              )}
+            </Show>
+            <Button
+              variant="neutral"
+              size="normal"
+              icon="xmark-small"
+              onClick={() => {
+                if (!props.sessionID || !props.serverKey) return
+                tabs.removeSessionTab({ server: props.serverKey, sessionId: props.sessionID })
+              }}
+            >
+              {language.t("session.error.notFound.closeTab")}
+            </Button>
+          </div>
+        </div>
+      </Show>
+    </Show>
   )
 }
 
diff --git a/packages/app/src/session/route.tsx b/packages/app/src/session/route.tsx
index 65fd80553a..c5d040bf81 100644
--- a/packages/app/src/session/route.tsx
+++ b/packages/app/src/session/route.tsx
@@ -12,9 +12,11 @@ import { ServerConnection } from "@/runtime/server/registry"
 import { TerminalProvider } from "@/session/terminal/context"
 import { useSettingsCommand } from "@/settings/command"
 import { SessionUIProvider } from "@/shell/routes/session-ui-provider"
+import { useTabs } from "@/shell/tabs/tabs"
 import { requireServerKey } from "@/shell/routes/session"
 import { useSessionModel } from "./model"
 import { SessionPanelFrame, SessionRouteFrame } from "./session-frame"
+import { IncompatibleServerPanel } from "./incompatible-server-panel"
 import { SessionErrorFallback } from "./route-error"
 import { createSessionResolution } from "./session-resolution"
 import { SessionScreen } from "./screen"
@@ -63,6 +65,7 @@ function SessionRouteErrorBoundary(
 function ResolvedTargetSessionRoute() {
   const params = useParams<{ id: string }>()
   const server = useServer()
+  const tabs = useTabs()
   const data = useData()
   const current = createSessionResolution(
     () => params.id,
@@ -72,14 +75,27 @@ function ResolvedTargetSessionRoute() {
   const directory = createMemo(() => current()?.location.directory)
 
   return (
-    <Show when={directory()}>
-      {(value) => (
-        <LocationProvider directory={value()}>
-          <SessionUIProvider directory={value()} server={server.key}>
-            <TargetSessionPage />
-          </SessionUIProvider>
-        </LocationProvider>
-      )}
+    <Show
+      when={!server.health?.incompatible}
+      fallback={
+        <SessionRouteFrame padded>
+          <SessionPanelFrame raised>
+            <IncompatibleServerPanel
+              onClose={() => tabs.removeSessionTab({ server: server.key, sessionId: params.id })}
+            />
+          </SessionPanelFrame>
+        </SessionRouteFrame>
+      }
+    >
+      <Show when={directory()}>
+        {(value) => (
+          <LocationProvider directory={value()}>
+            <SessionUIProvider directory={value()} server={server.key}>
+              <TargetSessionPage />
+            </SessionUIProvider>
+          </LocationProvider>
+        )}
+      </Show>
     </Show>
   )
 }