chore: drop built-in MCPs (#22173)

Drop something that was never used

codex-rs/features/src/lib.rs

@@ -134,8 +134,6 @@ pub enum Feature {
     Sqlite,
     /// Enable startup memory extraction and file-backed memory consolidation.
     MemoryTool,
-    /// Enable product-owned built-in MCP servers.
-    BuiltInMcp,
     /// Enable the Chronicle sidecar for passive screen-context memories.
     Chronicle,
     /// Append additional AGENTS.md guidance to user instructions.
@@ -152,7 +150,7 @@ pub enum Feature {
     Apps,
     /// Enable MCP apps.
     EnableMcpApps,
-    /// Use the new path for the built-in apps MCP server.
+    /// Use the new path for the host-owned apps MCP server.
     AppsMcpPathOverride,
     /// Enable the tool_search tool for apps.
     ToolSearch,
@@ -797,12 +795,6 @@ pub const FEATURES: &[FeatureSpec] = &[
         },
         default_enabled: false,
     },
-    FeatureSpec {
-        id: Feature::BuiltInMcp,
-        key: "builtin_mcp",
-        stage: Stage::UnderDevelopment,
-        default_enabled: false,
-    },
     FeatureSpec {
         id: Feature::Chronicle,
         key: "chronicle",

codex-rs/features/src/tests.rs

@@ -145,13 +145,6 @@ fn responses_websocket_response_processed_is_under_development() {
     );
 }
 
-#[test]
-fn builtin_mcp_is_under_development() {
-    assert_eq!(Feature::BuiltInMcp.stage(), Stage::UnderDevelopment);
-    assert_eq!(Feature::BuiltInMcp.default_enabled(), false);
-    assert_eq!(feature_for_key("builtin_mcp"), Some(Feature::BuiltInMcp));
-}
-
 #[test]
 fn terminal_resize_reflow_is_experimental_and_enabled_by_default() {
     assert_eq!(