From a5c7186739c4772e7385d979c668a82b4ef7d23c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jes=C3=BAs=20Fern=C3=A1ndez?=
 <7312236+fernandezcuesta@users.noreply.github.com>
Date: Mon, 21 Sep 2026 23:40:06 +0200
Subject: [PATCH 1/2] fix: expose max-send-message-size
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: Jesús Fernández <7312236+fernandezcuesta@users.noreply.github.com>
---
 crossplane/function/cli.py | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/crossplane/function/cli.py b/crossplane/function/cli.py
index ee22bdf..0b06f8c 100644
--- a/crossplane/function/cli.py
+++ b/crossplane/function/cli.py
@@ -56,12 +56,20 @@ def cli(cache_size, **kwargs):
 def standard_options(func: F) -> F:
     """Apply the standard Composition Function CLI options to a Click command."""
 
+    @click.option(
+        "--max-send-message-size",
+        type=int,
+        default=None,
+        envvar="MAX_SEND_MESSAGE_SIZE",
+        help="Maximum size of sent gRPC messages in MB. Defaults to --max-grpc-message-size.",
+    )
     @click.option(
         "--max-recv-message-size",
+        "--max-grpc-message-size",
         type=int,
         default=DEFAULT_MAX_RECV_MESSAGE_SIZE,
         show_default=True,
-        envvar="MAX_RECV_MESSAGE_SIZE",
+        envvar=["MAX_RECV_MESSAGE_SIZE", "MAX_GRPC_MESSAGE_SIZE"],
         help="Maximum size of received gRPC messages in MB.",
     )
     @click.option(
@@ -107,15 +115,18 @@ def run(  # noqa: PLR0913
     tls_certs_dir: str | None,
     insecure: bool,
     max_recv_message_size: int,
+    max_send_message_size: int | None,
 ) -> None:
     """Start a composition function gRPC server with standard options."""
     level = logging.Level.DEBUG if debug else logging.Level.INFO
     logging.configure(level=level)
 
-    size_bytes = max_recv_message_size * 1024 * 1024
+    if max_send_message_size is None:
+        max_send_message_size = max_recv_message_size
+
     options = [
-        ("grpc.max_receive_message_length", size_bytes),
-        ("grpc.max_send_message_length", size_bytes),
+        ("grpc.max_receive_message_length", max_recv_message_size * 1024 * 1024),
+        ("grpc.max_send_message_length", max_send_message_size * 1024 * 1024),
     ]
 
     runtime.serve(

From 9a0c9a6dd7cb1071635b297979f87c65dae7b266 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jes=C3=BAs=20Fern=C3=A1ndez?=
 <7312236+fernandezcuesta@users.noreply.github.com>
Date: Tue, 22 Sep 2026 00:09:51 +0200
Subject: [PATCH 2/2] fix: lint
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: Jesús Fernández <7312236+fernandezcuesta@users.noreply.github.com>
---
 crossplane/function/cli.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/crossplane/function/cli.py b/crossplane/function/cli.py
index 0b06f8c..e18967c 100644
--- a/crossplane/function/cli.py
+++ b/crossplane/function/cli.py
@@ -61,7 +61,8 @@ def standard_options(func: F) -> F:
         type=int,
         default=None,
         envvar="MAX_SEND_MESSAGE_SIZE",
-        help="Maximum size of sent gRPC messages in MB. Defaults to --max-grpc-message-size.",
+        help="Maximum size of sent gRPC messages in MB. "
+        "Defaults to --max-recv-message-size.",
     )
     @click.option(
         "--max-recv-message-size",