diff --git a/packages/integration-tests/src/agent-codex-launch-env.integration.test.ts b/packages/integration-tests/src/agent-codex-launch-env.integration.test.ts
new file mode 100644
index 000000000..6ad47f861
--- /dev/null
+++ b/packages/integration-tests/src/agent-codex-launch-env.integration.test.ts
@@ -0,0 +1,45 @@
+import { describe, expect, it } from "vitest";
+import type { AgentLaunchConfig } from "@composio/ao-core";
+import codexPlugin from "@composio/ao-plugin-agent-codex";
+
+function makeLaunchConfig(overrides: Partial<AgentLaunchConfig> = {}): AgentLaunchConfig {
+  return {
+    sessionId: "sess-int-1",
+    projectConfig: {
+      name: "my-project",
+      repo: "owner/repo",
+      path: "/workspace/repo",
+      defaultBranch: "main",
+      sessionPrefix: "my",
+    },
+    ...overrides,
+  };
+}
+
+describe("agent-codex launch/env wiring (integration)", () => {
+  const agent = codexPlugin.create();
+
+  it("includes check_for_update_on_startup=false in launch command", () => {
+    const cmd = agent.getLaunchCommand(makeLaunchConfig());
+    expect(cmd).toContain("-c check_for_update_on_startup=false");
+  });
+
+  it("preserves update-check override alongside other flags", () => {
+    const cmd = agent.getLaunchCommand(
+      makeLaunchConfig({
+        permissions: "skip",
+        model: "o3-mini",
+        prompt: "Do the thing",
+      }),
+    );
+    expect(cmd).toContain("-c check_for_update_on_startup=false");
+    expect(cmd).toContain("--dangerously-bypass-approvals-and-sandbox");
+    expect(cmd).toContain("--model 'o3-mini'");
+    expect(cmd).toContain("-c model_reasoning_effort=high");
+  });
+
+  it("sets CODEX_DISABLE_UPDATE_CHECK=1 in environment", () => {
+    const env = agent.getEnvironment(makeLaunchConfig());
+    expect(env["CODEX_DISABLE_UPDATE_CHECK"]).toBe("1");
+  });
+});