[apps] Add tool call meta. (#14647)

- [x] Add resource_uri and other things to _meta to shortcut resource
lookup and speed things up.

codex-rs/core/tests/suite/search_tool.rs

@@ -13,6 +13,7 @@ use codex_protocol::protocol::Op;
 use codex_protocol::protocol::SandboxPolicy;
 use codex_protocol::user_input::UserInput;
 use core_test_support::apps_test_server::AppsTestServer;
+use core_test_support::apps_test_server::CALENDAR_CREATE_EVENT_RESOURCE_URI;
 use core_test_support::responses::ResponsesRequest;
 use core_test_support::responses::ev_assistant_message;
 use core_test_support::responses::ev_completed;
@@ -30,8 +31,9 @@ use pretty_assertions::assert_eq;
 use serde_json::Value;
 use serde_json::json;
 
-const SEARCH_TOOL_DESCRIPTION_SNIPPETS: [&str; 1] = [
-    "Tools of the apps (Calendar) are hidden until you search for them with this tool (`tool_search`).",
+const SEARCH_TOOL_DESCRIPTION_SNIPPETS: [&str; 2] = [
+    "You have access to all the tools of the following apps/connectors",
+    "- Calendar: Plan events and manage your calendar.",
 ];
 const TOOL_SEARCH_TOOL_NAME: &str = "tool_search";
 const CALENDAR_CREATE_TOOL: &str = "mcp__codex_apps__calendar_create_event";
@@ -89,10 +91,6 @@ fn configure_apps(config: &mut Config, apps_base_url: &str) {
         .features
         .enable(Feature::Apps)
         .expect("test config should allow feature update");
-    config
-        .features
-        .disable(Feature::AppsMcpGateway)
-        .expect("test config should allow feature update");
     config.chatgpt_base_url = apps_base_url.to_string();
     config.model = Some("gpt-5-codex".to_string());
 
@@ -404,6 +402,19 @@ async fn tool_search_returns_deferred_tools_without_follow_up_tool_injection() -
             })),
         }
     );
+    assert_eq!(
+        end.result
+            .as_ref()
+            .expect("tool call should succeed")
+            .structured_content,
+        Some(json!({
+            "_codex_apps": {
+                "resource_uri": CALENDAR_CREATE_EVENT_RESOURCE_URI,
+                "contains_mcp_source": true,
+                "connector_id": "calendar",
+            },
+        }))
+    );
 
     wait_for_event(&test.codex, |event| {
         matches!(event, EventMsg::TurnComplete(_))