diff --git a/server/src/__tests__/plugin-routes-authz.test.ts b/server/src/__tests__/plugin-routes-authz.test.ts
index 9447bc93928..90371991576 100644
--- a/server/src/__tests__/plugin-routes-authz.test.ts
+++ b/server/src/__tests__/plugin-routes-authz.test.ts
@@ -146,11 +146,18 @@ describe.sequential("plugin install and upgrade authz", () => {
 
     expect(res.status).toBe(200);
     const packageNames = res.body.map((plugin: { packageName: string }) => plugin.packageName);
+    const byPackageName = new Map(
+      res.body.map((plugin: { packageName: string; experimental: boolean }) => [plugin.packageName, plugin]),
+    );
     expect(packageNames).toContain("@paperclipai/plugin-workspace-diff");
     expect(packageNames).toContain("@paperclipai/plugin-llm-wiki");
     expect(packageNames).toContain("@paperclipai/plugin-modal");
     expect(packageNames).toContain("@paperclipai/plugin-authoring-smoke-example");
     expect(packageNames).not.toContain("@paperclipai/plugin-sdk");
+    expect(byPackageName.get("@paperclipai/plugin-workspace-diff")?.experimental).toBe(true);
+    expect(byPackageName.get("@paperclipai/plugin-llm-wiki")?.experimental).toBe(true);
+    expect(byPackageName.get("@paperclipai/plugin-modal")?.experimental).toBe(true);
+    expect(byPackageName.get("@paperclipai/plugin-authoring-smoke-example")?.experimental).toBe(false);
   }, 20_000);
 
   it("rejects plugin installation for non-admin board users", async () => {
diff --git a/server/src/routes/plugins.ts b/server/src/routes/plugins.ts
index 9f48a0dc5f5..16434ef9011 100644
--- a/server/src/routes/plugins.ts
+++ b/server/src/routes/plugins.ts
@@ -121,6 +121,7 @@ interface AvailableBundledPlugin {
   description: string;
   localPath: string;
   tag: "example" | "first-party";
+  experimental: boolean;
 }
 
 /** Response body for GET /api/plugins/:pluginId/health */
@@ -150,6 +151,10 @@ const PLUGIN_SCOPED_API_RESPONSE_HEADER_ALLOWLIST = new Set([
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
 const REPO_ROOT = path.resolve(__dirname, "../../..");
+const EXPERIMENTAL_BUNDLED_PLUGIN_PACKAGE_NAMES = new Set([
+  "@paperclipai/plugin-llm-wiki",
+  "@paperclipai/plugin-workspace-diff",
+]);
 
 function titleCasePluginName(packageName: string): string {
   const localName = packageName.split("/").pop() ?? packageName;
@@ -244,6 +249,14 @@ function bundledPluginMetadata(
   }
 }
 
+function isExperimentalBundledPlugin(packageRoot: string, packageName: string): boolean {
+  return (
+    EXPERIMENTAL_BUNDLED_PLUGIN_PACKAGE_NAMES.has(packageName)
+    || packageRoot.includes(`${path.sep}sandbox-providers${path.sep}`)
+    || packageName.includes("sandbox")
+  );
+}
+
 function listBundledPlugins(): AvailableBundledPlugin[] {
   const pluginRoot = path.resolve(REPO_ROOT, "packages/plugins");
   return findPackageJsonFiles(pluginRoot)
@@ -274,6 +287,7 @@ function listBundledPlugins(): AvailableBundledPlugin[] {
             ?? `Bundled Paperclip plugin from ${path.relative(REPO_ROOT, packageRoot)}.`,
           localPath: packageRoot,
           tag,
+          experimental: isExperimentalBundledPlugin(packageRoot, packageName),
         },
       ];
     })
diff --git a/ui/src/api/plugins.ts b/ui/src/api/plugins.ts
index 8f4a548612d..b018756091e 100644
--- a/ui/src/api/plugins.ts
+++ b/ui/src/api/plugins.ts
@@ -139,6 +139,7 @@ export interface AvailableBundledPlugin {
   description: string;
   localPath: string;
   tag: "example" | "first-party";
+  experimental: boolean;
 }
 
 export interface PluginLocalFolderProblem {
diff --git a/ui/src/pages/PluginManager.tsx b/ui/src/pages/PluginManager.tsx
index d03c1f95771..7ae4f2dc301 100644
--- a/ui/src/pages/PluginManager.tsx
+++ b/ui/src/pages/PluginManager.tsx
@@ -43,6 +43,17 @@ function getPluginErrorSummary(plugin: PluginRecord): string {
   return firstNonEmptyLine(plugin.lastError) ?? "Plugin entered an error state without a stored error message.";
 }
 
+function ExperimentalBadge() {
+  return (
+    <Badge
+      variant="outline"
+      className="border-amber-500/30 bg-amber-500/10 text-amber-700 hover:bg-amber-500/10 dark:text-amber-200"
+    >
+      Experimental
+    </Badge>
+  );
+}
+
 /**
  * PluginManager page component.
  *
@@ -249,6 +260,7 @@ export function PluginManager() {
                         <Badge variant="outline">
                           {bundledPlugin.tag === "first-party" ? "First-party" : "Example"}
                         </Badge>
+                        {bundledPlugin.experimental && <ExperimentalBadge />}
                         {installedPlugin ? (
                           <Badge
                             variant={installedPlugin.status === "ready" ? "default" : "secondary"}
@@ -342,6 +354,7 @@ export function PluginManager() {
                             : "Example"}
                         </Badge>
                       )}
+                      {bundledByPackageName.get(plugin.packageName)?.experimental && <ExperimentalBadge />}
                     </div>
                     <div>
                       <p className="text-xs text-muted-foreground mt-0.5 truncate" title={plugin.packageName}>