diff --git a/src/lfx/src/lfx/cli/_serve_help.py b/src/lfx/src/lfx/cli/_serve_help.py
index ddf002681d..1f3b877f7f 100644
--- a/src/lfx/src/lfx/cli/_serve_help.py
+++ b/src/lfx/src/lfx/cli/_serve_help.py
@@ -45,6 +45,6 @@ RESET_ENVIRON = (
 SYNC_WORKERS = (
     "Use gunicorn's blocking 'sync' worker (Unix, --workers > 1) so the kernel "
     "routes each request to an idle worker instead of queueing it behind an "
-    "in-flight request on a busy async worker. Requires the 'a2wsgi' package. "
-    "Off by default (async worker)."
+    "in-flight request on a busy async worker. Uses the 'a2wsgi' bridge bundled "
+    "with lfx on Unix. Off by default (async worker)."
 )
diff --git a/src/lfx/src/lfx/cli/commands.py b/src/lfx/src/lfx/cli/commands.py
index 0e17e3c837..45dbaa697e 100644
--- a/src/lfx/src/lfx/cli/commands.py
+++ b/src/lfx/src/lfx/cli/commands.py
@@ -680,12 +680,15 @@ def _launch_workers(
             from lfx.cli.serve_gunicorn import LFXGunicornApp
 
             if sync_workers:
-                # Fail fast in the parent rather than per-worker on first request.
+                # Fail fast in the parent rather than per-worker on first request. a2wsgi
+                # ships with lfx on Linux/macOS, so a missing import means a broken
+                # environment, not a forgotten optional install.
                 try:
                     import a2wsgi  # noqa: F401
                 except ImportError as exc:
                     typer.echo(
-                        "Error: --use-sync-workers requires the 'a2wsgi' package. Install it with: pip install a2wsgi",
+                        "Error: --use-sync-workers needs 'a2wsgi', which ships with lfx on Linux/macOS; "
+                        "it is missing, so reinstall lfx to restore your environment.",
                         err=True,
                     )
                     raise typer.Exit(1) from exc
diff --git a/src/lfx/src/lfx/cli/serve_preloaded_app.py b/src/lfx/src/lfx/cli/serve_preloaded_app.py
index 6c68a5c3ad..2fd683fd29 100644
--- a/src/lfx/src/lfx/cli/serve_preloaded_app.py
+++ b/src/lfx/src/lfx/cli/serve_preloaded_app.py
@@ -42,7 +42,10 @@ def wsgi_application(environ, start_response):
         try:
             from a2wsgi import ASGIMiddleware
         except ImportError as exc:  # pragma: no cover - exercised via --use-sync-workers without the dep
-            msg = "lfx serve --use-sync-workers requires the 'a2wsgi' package. Install it with: pip install a2wsgi"
+            msg = (
+                "lfx serve --use-sync-workers needs 'a2wsgi', which ships with lfx on Linux/macOS; "
+                "it is missing, so reinstall lfx to restore your environment."
+            )
             raise RuntimeError(msg) from exc
         _bridge = ASGIMiddleware(app)
     return _bridge(environ, start_response)