diff --git a/.github/workflows/daily-codex-analysis.yml b/.github/workflows/daily-codex-analysis.yml
index ef955a13..96787cca 100644
--- a/.github/workflows/daily-codex-analysis.yml
+++ b/.github/workflows/daily-codex-analysis.yml
@@ -126,18 +126,74 @@ jobs:
         if: ${{ github.event.inputs.site_only != 'true' }}
         run: |
           $workspaceDir = Join-Path $env:GITHUB_WORKSPACE ".codex-preflight"
-          $script = @(
-            "from tradingagents.llm_clients.codex_preflight import run_codex_preflight",
-            "result = run_codex_preflight(",
-            "    codex_binary=None,",
-            "    model='gpt-5.4',",
-            "    request_timeout=30.0,",
-            "    workspace_dir=r'$workspaceDir',",
-            "    cleanup_threads=True,",
-            ")",
-            "print('Codex account:', result.account)",
-            "print('First available models:', ', '.join(result.models[:8]))"
-          ) -join "`n"
+          $script = @"
+import os
+from tradingagents.llm_clients.codex_app_server import CodexAppServerAuthError, CodexAppServerBinaryError
+from tradingagents.llm_clients.codex_preflight import run_codex_preflight
+
+workspace_dir = r"$workspaceDir"
+summary_path = os.getenv("GITHUB_STEP_SUMMARY")
+
+def write_summary(lines):
+    if not summary_path:
+        return
+    with open(summary_path, "a", encoding="utf-8") as handle:
+        handle.write("\n".join(lines) + "\n")
+
+try:
+    result = run_codex_preflight(
+        codex_binary=None,
+        model="gpt-5.4",
+        request_timeout=30.0,
+        workspace_dir=workspace_dir,
+        cleanup_threads=True,
+    )
+except CodexAppServerAuthError as exc:
+    message = (
+        "Codex is installed but not logged in for the runner. "
+        "Run `codex login` or `codex login --device-auth` on the runner machine, "
+        "then retry the workflow."
+    )
+    print(f"::error::{message}")
+    print(exc)
+    write_summary(
+        [
+            "## Codex login required",
+            "",
+            message,
+        ]
+    )
+    raise SystemExit(1)
+except CodexAppServerBinaryError as exc:
+    message = (
+        "A usable Codex binary is not available for the runner. "
+        "Check the `CODEX_BINARY` repository variable or install Codex for the runner service account."
+    )
+    print(f"::error::{message}")
+    print(exc)
+    write_summary(
+        [
+            "## Codex runtime issue",
+            "",
+            message,
+            "",
+            str(exc),
+        ]
+    )
+    raise SystemExit(1)
+
+print("Codex account:", result.account)
+print("First available models:", ", ".join(result.models[:8]))
+write_summary(
+    [
+        "## Codex preflight passed",
+        "",
+        f"- Account: {result.account}",
+        f"- Models: {', '.join(result.models[:8])}",
+        f"- Binary: {os.getenv('CODEX_BINARY', '(auto)')}",
+    ]
+)
+"@
           $script | python -
           if ($LASTEXITCODE) { exit $LASTEXITCODE }