From 5e3a6fe4eee7bab705fed03b0dbed9bc110ef4cd Mon Sep 17 00:00:00 2001
From: Eric Traut <etraut@openai.com>
Date: Thu, 20 Aug 2026 04:45:12 +0000
Subject: [PATCH] Warn when launching the deprecated MCP server (#39657)

## What changed

Print a warning to standard error when `codex mcp-server` is invoked, noting
that the command is deprecated and will be removed in a future release. The
server continues to launch after the warning.

GitOrigin-RevId: 0fefa2579a420a2fad85ef3afe373204f9836869
---
 codex-rs/cli/src/main.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/codex-rs/cli/src/main.rs b/codex-rs/cli/src/main.rs
index 03a81f9b7e..45218a6d39 100644
--- a/codex-rs/cli/src/main.rs
+++ b/codex-rs/cli/src/main.rs
@@ -1179,6 +1179,9 @@ async fn cli_main(
             codex_exec::run_main(exec_cli, arg0_paths.clone()).await?;
         }
         Some(Subcommand::McpServer(McpServerCommand { strict_config })) => {
+            eprintln!(
+                "warning: `codex mcp-server` is deprecated and will be removed in a future release."
+            );
             reject_remote_mode_for_subcommand(
                 root_remote.as_deref(),
                 root_remote_auth_token_env.as_deref(),