diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3c37112cee6..b89cd49f60d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -32,6 +32,7 @@ Docs: https://docs.openclaw.ai
 - Telegram/media downloads: let Telegram media fetches trust an operator-configured explicit proxy for target DNS resolution after hostname-policy checks, so proxy-backed installs stop failing `could not download media` on Bot API file downloads after the DNS-pinning regression. (#66245) Thanks @dawei41468 and @vincentkoc.
 - Browser: keep loopback CDP readiness checks reachable under strict SSRF defaults so OpenClaw can reconnect to locally started managed Chrome. (#66354) Thanks @hxy91819.
 - Agents/context engine: compact engine-owned sessions from the first tool-loop delta and preserve ingest fallback when `afterTurn` is absent, so long-running tool loops can stay bounded without dropping engine state. (#63555) Thanks @Bikkies.
+- OpenAI Codex/auth: keep malformed Codex CLI auth-file diagnostics on the debug logger instead of stdout so interactive command output stays clean while auth read failures remain traceable. (#66451) Thanks @SimbaKingjoe.
 - Discord/native commands: return the real status card for native `/status` interactions instead of falling through to the synthetic `✅ Done.` ack when the generic dispatcher produces no visible reply. (#54629) Thanks @tkozzer and @vincentkoc.
 - Hooks/Ollama: let LLM-backed session-memory slug generation honor an explicit `agents.defaults.timeoutSeconds` override instead of always aborting after 15 seconds, so slow local Ollama runs stop silently dropping back to generic filenames. (#66237) Thanks @dmak and @vincentkoc.
 - Media/transcription: remap `.aac` filenames to `.m4a` for OpenAI-compatible audio uploads so AAC voice notes stop failing MIME-sensitive transcription endpoints. (#66446) Thanks @ben-z.
diff --git a/extensions/openai/index.test.ts b/extensions/openai/index.test.ts
index 61be535cfb8..065ab53dce5 100644
--- a/extensions/openai/index.test.ts
+++ b/extensions/openai/index.test.ts
@@ -22,9 +22,15 @@ const runtimeMocks = vi.hoisted(() => ({
   refreshOpenAICodexToken: vi.fn(),
 }));
 
-vi.mock("openclaw/plugin-sdk/runtime-env", () => ({
-  ensureGlobalUndiciEnvProxyDispatcher: runtimeMocks.ensureGlobalUndiciEnvProxyDispatcher,
-}));
+vi.mock("openclaw/plugin-sdk/runtime-env", async () => {
+  const actual = await vi.importActual<typeof import("openclaw/plugin-sdk/runtime-env")>(
+    "openclaw/plugin-sdk/runtime-env",
+  );
+  return {
+    ...actual,
+    ensureGlobalUndiciEnvProxyDispatcher: runtimeMocks.ensureGlobalUndiciEnvProxyDispatcher,
+  };
+});
 
 vi.mock("@mariozechner/pi-ai/oauth", async () => {
   const actual = await vi.importActual<typeof import("@mariozechner/pi-ai/oauth")>(
diff --git a/extensions/openai/openai-codex-cli-auth.test.ts b/extensions/openai/openai-codex-cli-auth.test.ts
index b941ca2121a..a8bcd103fad 100644
--- a/extensions/openai/openai-codex-cli-auth.test.ts
+++ b/extensions/openai/openai-codex-cli-auth.test.ts
@@ -1,5 +1,16 @@
 import fs from "node:fs";
-import { afterEach, describe, expect, it, vi } from "vitest";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+
+const runtimeMocks = vi.hoisted(() => ({
+  debug: vi.fn(),
+}));
+
+vi.mock("openclaw/plugin-sdk/runtime-env", () => ({
+  createSubsystemLogger: () => ({
+    debug: runtimeMocks.debug,
+  }),
+}));
+
 import {
   OPENAI_CODEX_DEFAULT_PROFILE_ID,
   readOpenAICodexCliOAuthProfile,
@@ -12,6 +23,10 @@ function buildJwt(payload: Record<string, unknown>) {
 }
 
 describe("readOpenAICodexCliOAuthProfile", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
   afterEach(() => {
     vi.restoreAllMocks();
   });
@@ -80,4 +95,54 @@ describe("readOpenAICodexCliOAuthProfile", () => {
 
     expect(parsed).toBeNull();
   });
+
+  it("returns null without logging when the Codex CLI auth file is missing", () => {
+    const error = Object.assign(new Error("missing"), {
+      code: "ENOENT",
+    });
+    vi.spyOn(fs, "readFileSync").mockImplementation(() => {
+      throw error;
+    });
+
+    const parsed = readOpenAICodexCliOAuthProfile({
+      store: { version: 1, profiles: {} },
+    });
+
+    expect(parsed).toBeNull();
+    expect(runtimeMocks.debug).not.toHaveBeenCalled();
+  });
+
+  it("logs a sanitized code for invalid auth JSON", () => {
+    vi.spyOn(fs, "readFileSync").mockReturnValue("{");
+
+    const parsed = readOpenAICodexCliOAuthProfile({
+      store: { version: 1, profiles: {} },
+    });
+
+    expect(parsed).toBeNull();
+    expect(runtimeMocks.debug).toHaveBeenCalledWith(
+      "Failed to read Codex CLI auth file (code=INVALID_JSON)",
+    );
+  });
+
+  it("does not leak auth file paths in debug logs for filesystem failures", () => {
+    const error = Object.assign(
+      new Error("EACCES: permission denied, open '/Users/alice/.codex/auth.json'"),
+      {
+        code: "EACCES",
+      },
+    );
+    vi.spyOn(fs, "readFileSync").mockImplementation(() => {
+      throw error;
+    });
+
+    const parsed = readOpenAICodexCliOAuthProfile({
+      store: { version: 1, profiles: {} },
+    });
+
+    expect(parsed).toBeNull();
+    expect(runtimeMocks.debug).toHaveBeenCalledWith(
+      "Failed to read Codex CLI auth file (code=EACCES)",
+    );
+  });
 });
diff --git a/extensions/openai/openai-codex-cli-auth.ts b/extensions/openai/openai-codex-cli-auth.ts
index 289e2bef017..314d7560063 100644
--- a/extensions/openai/openai-codex-cli-auth.ts
+++ b/extensions/openai/openai-codex-cli-auth.ts
@@ -2,6 +2,7 @@ import fs from "node:fs";
 import path from "node:path";
 import type { AuthProfileStore, OAuthCredential } from "openclaw/plugin-sdk/provider-auth";
 import { resolveRequiredHomeDir } from "openclaw/plugin-sdk/provider-auth";
+import { createSubsystemLogger } from "openclaw/plugin-sdk/runtime-env";
 import {
   resolveCodexAccessTokenExpiry,
   resolveCodexAuthIdentity,
@@ -9,6 +10,7 @@ import {
 import { trimNonEmptyString } from "./openai-codex-shared.js";
 
 const PROVIDER_ID = "openai-codex";
+const log = createSubsystemLogger("openai/codex-cli-auth");
 
 export const CODEX_CLI_PROFILE_ID = `${PROVIDER_ID}:codex-cli`;
 export const OPENAI_CODEX_DEFAULT_PROFILE_ID = `${PROVIDER_ID}:default`;
@@ -42,7 +44,19 @@ function readCodexCliAuthFile(env: NodeJS.ProcessEnv): CodexCliAuthFile | null {
     const raw = fs.readFileSync(authPath, "utf8");
     const parsed = JSON.parse(raw);
     return parsed && typeof parsed === "object" ? (parsed as CodexCliAuthFile) : null;
-  } catch {
+  } catch (error) {
+    const code =
+      error instanceof SyntaxError
+        ? "INVALID_JSON"
+        : error instanceof Error && "code" in error
+          ? (error as NodeJS.ErrnoException).code
+          : undefined;
+    if (code === "ENOENT") {
+      return null;
+    }
+    log.debug(
+      `Failed to read Codex CLI auth file (code=${typeof code === "string" ? code : "UNKNOWN"})`,
+    );
     return null;
   }
 }