Remove the deprecated codex mcp-server command (#42993)

## What changed

Remove the `codex mcp-server` subcommand and the standalone `codex-mcp-server` crate, including its tests, interface documentation, build dependencies, and run recipe.

## Testing

Update the strict configuration test to use `codex exec hello`, preserving coverage for rejecting unknown configuration overrides.

GitOrigin-RevId: 8688b1f41862d7c2073ea2812a257c0087c55d9c

codex-rs/cli/src/main.rs

@@ -167,9 +167,6 @@ enum Subcommand {
     /// Manage Codex plugins.
     Plugin(PluginCli),
 
-    /// Start Codex as an MCP server (stdio).
-    McpServer(McpServerCommand),
-
     /// [experimental] Run the app server or related tooling.
     AppServer(AppServerCommand),
 
@@ -322,13 +319,6 @@ struct ReviewCommand {
     args: ReviewArgs,
 }
 
-#[derive(Debug, Parser)]
-struct McpServerCommand {
-    /// Error out when config.toml contains fields that are not recognized by this version of Codex.
-    #[arg(long = "strict-config", default_value_t = false)]
-    strict_config: bool,
-}
-
 #[derive(Debug, Parser)]
 struct DebugTraceReduceCommand {
     /// Trace bundle directory containing manifest.json and trace.jsonl.
@@ -1270,22 +1260,6 @@ 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(),
-                "mcp-server",
-            )?;
-            codex_mcp_server::run_main(
-                arg0_paths.clone(),
-                root_config_overrides,
-                strict_config || root_strict_config,
-            )
-            .await?;
-        }
         Some(Subcommand::Mcp(mut mcp_cli)) => {
             reject_remote_mode_for_subcommand(
                 root_remote.as_deref(),
@@ -2563,7 +2537,6 @@ fn unsupported_subcommand_name_for_strict_config(
         | Some(Subcommand::Agents(_))
         | Some(Subcommand::Exec(_))
         | Some(Subcommand::Review(_))
-        | Some(Subcommand::McpServer(_))
         | Some(Subcommand::ExecServer(_))
         | Some(Subcommand::Resume(_))
         | Some(Subcommand::Queue(_))
@@ -4411,15 +4384,6 @@ mod tests {
         let cli = MultitoolCli::try_parse_from(["codex", "--strict-config"]).expect("parse");
         assert!(cli.interactive.strict_config);
 
-        let cli = MultitoolCli::try_parse_from(["codex", "mcp-server", "--strict-config"])
-            .expect("parse");
-        assert_matches!(
-            cli.subcommand,
-            Some(Subcommand::McpServer(McpServerCommand {
-                strict_config: true,
-            }))
-        );
-
         let cli =
             MultitoolCli::try_parse_from(["codex", "review", "--strict-config", "--uncommitted"])
                 .expect("parse");