[MCP] Add an enabled config field (#4917)

This lets users more easily toggle MCP servers.

codex-rs/cli/tests/mcp_add_remove.rs

@@ -35,6 +35,7 @@ async fn add_and_remove_server_updates_global_config() -> Result<()> {
         }
         other => panic!("unexpected transport: {other:?}"),
     }
+    assert!(docs.enabled);
 
     let mut remove_cmd = codex_command(codex_home.path())?;
     remove_cmd
@@ -90,6 +91,7 @@ async fn add_with_env_preserves_key_order_and_values() -> Result<()> {
     assert_eq!(env.len(), 2);
     assert_eq!(env.get("FOO"), Some(&"bar".to_string()));
     assert_eq!(env.get("ALPHA"), Some(&"beta".to_string()));
+    assert!(envy.enabled);
 
     Ok(())
 }
@@ -116,6 +118,7 @@ async fn add_streamable_http_without_manual_token() -> Result<()> {
         }
         other => panic!("unexpected transport: {other:?}"),
     }
+    assert!(github.enabled);
 
     assert!(!codex_home.path().join(".credentials.json").exists());
     assert!(!codex_home.path().join(".env").exists());
@@ -153,6 +156,7 @@ async fn add_streamable_http_with_custom_env_var() -> Result<()> {
         }
         other => panic!("unexpected transport: {other:?}"),
     }
+    assert!(issues.enabled);
     Ok(())
 }
 

codex-rs/cli/tests/mcp_list.rs

@@ -1,6 +1,7 @@
 use std::path::Path;
 
 use anyhow::Result;
+use predicates::prelude::PredicateBooleanExt;
 use predicates::str::contains;
 use pretty_assertions::assert_eq;
 use serde_json::Value as JsonValue;
@@ -53,6 +54,8 @@ fn list_and_get_render_expected_output() -> Result<()> {
     assert!(stdout.contains("docs"));
     assert!(stdout.contains("docs-server"));
     assert!(stdout.contains("TOKEN=secret"));
+    assert!(stdout.contains("Status"));
+    assert!(stdout.contains("enabled"));
 
     let mut list_json_cmd = codex_command(codex_home.path())?;
     let json_output = list_json_cmd.args(["mcp", "list", "--json"]).output()?;
@@ -64,6 +67,7 @@ fn list_and_get_render_expected_output() -> Result<()> {
         json!([
           {
             "name": "docs",
+            "enabled": true,
             "transport": {
               "type": "stdio",
               "command": "docs-server",
@@ -91,6 +95,7 @@ fn list_and_get_render_expected_output() -> Result<()> {
     assert!(stdout.contains("command: docs-server"));
     assert!(stdout.contains("args: --port 4000"));
     assert!(stdout.contains("env: TOKEN=secret"));
+    assert!(stdout.contains("enabled: true"));
     assert!(stdout.contains("remove: codex mcp remove docs"));
 
     let mut get_json_cmd = codex_command(codex_home.path())?;
@@ -98,7 +103,7 @@ fn list_and_get_render_expected_output() -> Result<()> {
         .args(["mcp", "get", "docs", "--json"])
         .assert()
         .success()
-        .stdout(contains("\"name\": \"docs\""));
+        .stdout(contains("\"name\": \"docs\"").and(contains("\"enabled\": true")));
 
     Ok(())
 }