diff --git a/codex-rs/ext/mcp/src/lib.rs b/codex-rs/ext/mcp/src/lib.rs
index d4f2bcf976..36ff751e2a 100644
--- a/codex-rs/ext/mcp/src/lib.rs
+++ b/codex-rs/ext/mcp/src/lib.rs
@@ -27,13 +27,18 @@ impl McpServerContributor<Config> for HostedPluginRuntimeExtension {
                 return vec![McpServerContribution::Remove { name }];
             }
 
+            let mut server_config = hosted_plugin_runtime_mcp_server_config(
+                &config.chatgpt_base_url,
+                config.apps_mcp_product_sku.as_deref(),
+                context.originator(),
+            );
+            server_config.supports_parallel_tool_calls = config
+                .features
+                .enabled(codex_features::Feature::CodexAppsParallelToolCalls);
+
             vec![McpServerContribution::Set {
                 name,
-                config: Box::new(hosted_plugin_runtime_mcp_server_config(
-                    &config.chatgpt_base_url,
-                    config.apps_mcp_product_sku.as_deref(),
-                    context.originator(),
-                )),
+                config: Box::new(server_config),
             }]
         })
     }
diff --git a/codex-rs/ext/mcp/tests/hosted_apps_mcp.rs b/codex-rs/ext/mcp/tests/hosted_apps_mcp.rs
index 3836234b84..7ad9911f06 100644
--- a/codex-rs/ext/mcp/tests/hosted_apps_mcp.rs
+++ b/codex-rs/ext/mcp/tests/hosted_apps_mcp.rs
@@ -23,6 +23,10 @@ async fn contributes_hosted_plugin_runtime_without_an_executor() -> TestResult {
         .fallback_cwd(Some(codex_home.path().to_path_buf()))
         .cli_overrides(vec![
             ("features.apps".to_string(), true.into()),
+            (
+                "features.codex_apps_parallel_tool_calls".to_string(),
+                true.into(),
+            ),
             ("chatgpt_base_url".to_string(), "https://chatgpt.com".into()),
         ])
         .build()
@@ -39,6 +43,7 @@ async fn contributes_hosted_plugin_runtime_without_an_executor() -> TestResult {
         panic!("hosted plugin runtime should use streamable HTTP");
     };
     assert_eq!(url, "https://chatgpt.com/backend-api/ps/mcp");
+    assert!(server.supports_parallel_tool_calls);
 
     Ok(())
 }