diff --git a/src/plugins/installed-plugin-index-record-builder.ts b/src/plugins/installed-plugin-index-record-builder.ts
index 3147df8452b..2135adab3c4 100644
--- a/src/plugins/installed-plugin-index-record-builder.ts
+++ b/src/plugins/installed-plugin-index-record-builder.ts
@@ -76,7 +76,9 @@ function buildStartupInfo(record: PluginManifestRecord): InstalledPluginStartupI
   };
 }
 
-function collectCompatCodes(record: PluginManifestRecord): readonly PluginCompatCode[] {
+export function collectPluginManifestCompatCodes(
+  record: PluginManifestRecord,
+): readonly PluginCompatCode[] {
   const codes: PluginCompatCode[] = [];
   if (isLegacyImplicitStartupSidecar(record)) {
     codes.push("legacy-implicit-startup-sidecar");
@@ -271,7 +273,7 @@ export function buildInstalledPluginIndexRecords(params: {
       origin: record.origin,
       enabled,
       startup: buildStartupInfo(record),
-      compat: collectCompatCodes(record),
+      compat: collectPluginManifestCompatCodes(record),
     };
     if (record.format && record.format !== "openclaw") {
       indexRecord.format = record.format;
diff --git a/src/plugins/loader.ts b/src/plugins/loader.ts
index 406bcff8c61..ff6f131456b 100644
--- a/src/plugins/loader.ts
+++ b/src/plugins/loader.ts
@@ -57,6 +57,7 @@ import {
   listRegisteredCompactionProviders,
   restoreRegisteredCompactionProviders,
 } from "./compaction-provider.js";
+import type { PluginCompatCode } from "./compat/registry.js";
 import {
   applyTestPluginDefaults,
   createPluginActivationSource,
@@ -71,6 +72,7 @@ import {
 import { discoverOpenClawPlugins, type PluginCandidate } from "./discovery.js";
 import { getGlobalHookRunner, initializeGlobalHookRunner } from "./hook-runner-global.js";
 import { toSafeImportPath } from "./import-specifier.js";
+import { collectPluginManifestCompatCodes } from "./installed-plugin-index-record-builder.js";
 import { loadInstalledPluginIndexInstallRecordsSync } from "./installed-plugin-index-records.js";
 import {
   clearPluginInteractiveHandlers,
@@ -1755,6 +1757,7 @@ function createPluginRecord(params: {
   origin: PluginRecord["origin"];
   workspaceDir?: string;
   enabled: boolean;
+  compat?: readonly PluginCompatCode[];
   activationState?: PluginActivationState;
   syntheticAuthRefs?: string[];
   configSchema: boolean;
@@ -1773,6 +1776,7 @@ function createPluginRecord(params: {
     origin: params.origin,
     workspaceDir: params.workspaceDir,
     enabled: params.enabled,
+    compat: params.compat,
     explicitlyEnabled: params.activationState?.explicitlyEnabled,
     activated: params.activationState?.activated,
     activationSource: params.activationState?.source,
@@ -2435,6 +2439,7 @@ export function loadOpenClawPlugins(options: PluginLoadOptions = {}): PluginRegi
           origin: candidate.origin,
           workspaceDir: candidate.workspaceDir,
           enabled: false,
+          compat: collectPluginManifestCompatCodes(manifestRecord),
           activationState,
           syntheticAuthRefs: manifestRecord.syntheticAuthRefs,
           configSchema: Boolean(manifestRecord.configSchema),
@@ -2469,6 +2474,7 @@ export function loadOpenClawPlugins(options: PluginLoadOptions = {}): PluginRegi
         origin: candidate.origin,
         workspaceDir: candidate.workspaceDir,
         enabled: enableState.enabled,
+        compat: collectPluginManifestCompatCodes(manifestRecord),
         activationState,
         syntheticAuthRefs: manifestRecord.syntheticAuthRefs,
         configSchema: Boolean(manifestRecord.configSchema),
@@ -3342,6 +3348,7 @@ export async function loadOpenClawPluginCliRegistry(
         origin: candidate.origin,
         workspaceDir: candidate.workspaceDir,
         enabled: false,
+        compat: collectPluginManifestCompatCodes(manifestRecord),
         activationState,
         syntheticAuthRefs: manifestRecord.syntheticAuthRefs,
         configSchema: Boolean(manifestRecord.configSchema),
@@ -3376,6 +3383,7 @@ export async function loadOpenClawPluginCliRegistry(
       origin: candidate.origin,
       workspaceDir: candidate.workspaceDir,
       enabled: enableState.enabled,
+      compat: collectPluginManifestCompatCodes(manifestRecord),
       activationState,
       syntheticAuthRefs: manifestRecord.syntheticAuthRefs,
       configSchema: Boolean(manifestRecord.configSchema),
diff --git a/src/plugins/status.compatibility.integration.test.ts b/src/plugins/status.compatibility.integration.test.ts
new file mode 100644
index 00000000000..9e6d3b401c7
--- /dev/null
+++ b/src/plugins/status.compatibility.integration.test.ts
@@ -0,0 +1,70 @@
+import fs from "node:fs";
+import path from "node:path";
+import { afterAll, afterEach, describe, expect, it } from "vitest";
+import { withEnv } from "../test-utils/env.js";
+import {
+  cleanupPluginLoaderFixturesForTest,
+  makeTempDir,
+  resetPluginLoaderTestStateForTest,
+  useNoBundledPlugins,
+  writePlugin,
+} from "./loader.test-fixtures.js";
+import { buildPluginCompatibilitySnapshotNotices } from "./status.js";
+
+function addStartupActivation(pluginDir: string, onStartup: boolean): void {
+  const manifestPath = path.join(pluginDir, "openclaw.plugin.json");
+  const manifest = JSON.parse(fs.readFileSync(manifestPath, "utf-8")) as Record<string, unknown>;
+  fs.writeFileSync(
+    manifestPath,
+    `${JSON.stringify({ ...manifest, activation: { onStartup } }, null, 2)}\n`,
+    "utf-8",
+  );
+}
+
+function buildSnapshotCompatibilityNoticeCodes(plugin: { dir: string; file: string; id: string }) {
+  const stateDir = makeTempDir();
+  return withEnv({ OPENCLAW_STATE_DIR: stateDir }, () => {
+    useNoBundledPlugins();
+    return buildPluginCompatibilitySnapshotNotices({
+      config: {
+        plugins: {
+          load: { paths: [plugin.file] },
+          allow: [plugin.id],
+        },
+      },
+      workspaceDir: plugin.dir,
+      env: process.env,
+    }).map((notice) => notice.code);
+  });
+}
+
+describe("plugin compatibility snapshot notices", () => {
+  afterEach(() => {
+    resetPluginLoaderTestStateForTest();
+  });
+
+  afterAll(() => {
+    cleanupPluginLoaderFixturesForTest();
+  });
+
+  it("reports implicit startup sidecar compatibility from a real legacy manifest", () => {
+    const plugin = writePlugin({
+      id: "legacy-sidecar",
+      body: `module.exports = { id: "legacy-sidecar", register() {} };\n`,
+    });
+
+    expect(buildSnapshotCompatibilityNoticeCodes(plugin)).toEqual([
+      "legacy-implicit-startup-sidecar",
+    ]);
+  });
+
+  it("does not report implicit startup compatibility for explicit startup-lazy manifests", () => {
+    const plugin = writePlugin({
+      id: "modern-startup-lazy",
+      body: `module.exports = { id: "modern-startup-lazy", register() {} };\n`,
+    });
+    addStartupActivation(plugin.dir, false);
+
+    expect(buildSnapshotCompatibilityNoticeCodes(plugin)).toEqual([]);
+  });
+});