Render namespace description for tools (#16879)

codex-rs/core/src/tools/code_mode/mod.rs

@@ -257,15 +257,14 @@ async fn build_nested_router(exec: &ExecContext) -> ToolRouter {
         .read()
         .await
         .list_all_tools()
-        .await
-        .into_iter()
-        .map(|(name, tool_info)| (name, tool_info.tool))
-        .collect();
+        .await;
+    let mcp_tool_router_inputs = crate::tools::router::map_mcp_tool_infos(&mcp_tools);
 
     ToolRouter::from_config(
         &nested_tools_config,
         ToolRouterParams {
-            mcp_tools: Some(mcp_tools),
+            mcp_tools: Some(mcp_tool_router_inputs.mcp_tools),
+            tool_namespaces: Some(mcp_tool_router_inputs.tool_namespaces),
             app_tools: None,
             discoverable_tools: None,
             dynamic_tools: exec.turn.dynamic_tools.as_slice(),