diff --git a/src/npx-cli/commands/install.ts b/src/npx-cli/commands/install.ts
index bd45b77edd..3aabcbcb4a 100644
--- a/src/npx-cli/commands/install.ts
+++ b/src/npx-cli/commands/install.ts
@@ -1599,6 +1599,7 @@ async function runInstallCommandInner(options: InstallOptions, summary: InstallS
             }
             writeInstallMarker(cacheDir, version, bunVersion, uvVersion);
           }
+          writeInstallMarker(join(marketplaceDirectory(), 'plugin'), version, bunVersion, uvVersion);
           return `Runtime ready (Bun ${bunVersion}, uv ${uvVersion}) ${pc.green('OK')}`;
         },
       },
diff --git a/src/services/integrations/CodexCliInstaller.ts b/src/services/integrations/CodexCliInstaller.ts
index 62a7c86616..d890cc9cd7 100644
--- a/src/services/integrations/CodexCliInstaller.ts
+++ b/src/services/integrations/CodexCliInstaller.ts
@@ -126,18 +126,6 @@ function runCodex(args: string[]): void {
   }
 }
 
-function runCodexBestEffort(args: string[], successMessage: string, failureMessage: string): boolean {
-  try {
-    runCodex(args);
-    console.log(`  ${successMessage}`);
-    return true;
-  } catch (error) {
-    const message = error instanceof Error ? error.message : String(error);
-    console.warn(`  ${failureMessage}: ${message}`);
-    return false;
-  }
-}
-
 function isMarketplaceDifferentSourceError(error: unknown): boolean {
   const message = error instanceof Error ? error.message : String(error);
   return message.includes(`marketplace '${MARKETPLACE_NAME}' is already added from a different source`)
@@ -419,11 +407,8 @@ export async function installCodexCli(marketplaceRootOverride?: string): Promise
     console.log(`  Registering Codex plugin marketplace: ${marketplaceRoot}`);
     registerCodexMarketplace(marketplaceRoot);
     enableCodexPluginConfig();
-    runCodexBestEffort(
-      ['plugin', 'marketplace', 'upgrade', MARKETPLACE_NAME],
-      'Refreshed Codex marketplace and installed plugin cache.',
-      'Could not refresh Codex marketplace cache; reinstall or upgrade claude-mem from /plugins if Codex still uses old MCP config',
-    );
+    runCodex(['plugin', 'add', CODEX_PLUGIN_ID]);
+    console.log('  Installed Codex plugin cache.');
     if (!cleanupLegacyCodexAgentsMdContext()) {
       console.warn(`  Native Codex hooks registered, but failed to remove legacy AGENTS.md context from ${CODEX_AGENTS_MD_PATH}.`);
     }
diff --git a/tests/install-non-tty.test.ts b/tests/install-non-tty.test.ts
index 576784f8c3..cb9b0ab6ab 100644
--- a/tests/install-non-tty.test.ts
+++ b/tests/install-non-tty.test.ts
@@ -147,13 +147,23 @@ describe('Install Non-TTY Support', () => {
       expect(installSource).toContain('installCodexCli(marketplaceDirectory())');
     });
 
-    it('refreshes Codex marketplace cache after registration', () => {
+    it('installs the Codex plugin cache after local marketplace registration', () => {
       const installRegion = codexInstallerSource.slice(
         codexInstallerSource.indexOf('export async function installCodexCli'),
         codexInstallerSource.indexOf('export function uninstallCodexCli'),
       );
-      expect(installRegion).toContain("['plugin', 'marketplace', 'upgrade', MARKETPLACE_NAME]");
-      expect(installRegion).toContain('installed plugin cache');
+      expect(installRegion).toContain("runCodex(['plugin', 'add', CODEX_PLUGIN_ID])");
+      expect(installRegion).toContain('Installed Codex plugin cache.');
+      expect(installRegion).not.toContain('runCodexBestEffort(');
+      expect(installRegion).not.toContain("['plugin', 'marketplace', 'upgrade', MARKETPLACE_NAME]");
+    });
+
+    it('copies the install marker into the bundled marketplace plugin before Codex installs it', () => {
+      const runtimeSetupRegion = installSource.slice(
+        installSource.indexOf("title: 'Setting up runtime"),
+        installSource.indexOf("return `Runtime ready"),
+      );
+      expect(runtimeSetupRegion).toContain("writeInstallMarker(join(marketplaceDirectory(), 'plugin'), version, bunVersion, uvVersion)");
     });
 
     it('replaces stale Codex marketplace registrations from a different source', () => {