Speed up /mcp inventory listing (#16831)

Addresses #16244

This was a performance regression introduced when we moved the TUI on
top of the app server API.

Problem: `/mcp` rebuilt a full MCP inventory through
`mcpServerStatus/list`, including resources and resource templates that
made the TUI wait on slow inventory probes.

Solution: add a lightweight `detail` mode to `mcpServerStatus/list`,
have `/mcp` request tools-and-auth only, and cover the fast path with
app-server and TUI tests.

Testing: Confirmed slow (multi-second) response prior to change and
immediate response after change.

I considered two options:
1. Change the existing `mcpServerStatus/list` API to accept an optional
"details" parameter so callers can request only a subset of the
information.
2. Add a separate `mcpServer/list` API that returns only the servers,
tools, and auth but omits the resources.

I chose option 1, but option 2 is also a reasonable approach.

codex-rs/app-server-protocol/schema/json/ClientRequest.json

@@ -1042,6 +1042,17 @@
             "null"
           ]
         },
+        "detail": {
+          "anyOf": [
+            {
+              "$ref": "#/definitions/McpServerStatusDetail"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "description": "Controls how much MCP inventory data to fetch for each server. Defaults to `Full` when omitted."
+        },
         "limit": {
           "description": "Optional page size; defaults to a server-defined value.",
           "format": "uint32",
@@ -1235,6 +1246,13 @@
       ],
       "type": "object"
     },
+    "McpServerStatusDetail": {
+      "enum": [
+        "full",
+        "toolsAndAuthOnly"
+      ],
+      "type": "string"
+    },
     "MergeStrategy": {
       "enum": [
         "replace",

codex-rs/app-server-protocol/schema/json/codex_app_server_protocol.schemas.json

@@ -8604,6 +8604,17 @@
               "null"
             ]
           },
+          "detail": {
+            "anyOf": [
+              {
+                "$ref": "#/definitions/v2/McpServerStatusDetail"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "description": "Controls how much MCP inventory data to fetch for each server. Defaults to `Full` when omitted."
+          },
           "limit": {
             "description": "Optional page size; defaults to a server-defined value.",
             "format": "uint32",
@@ -9044,6 +9055,13 @@
         ],
         "type": "object"
       },
+      "McpServerStatusDetail": {
+        "enum": [
+          "full",
+          "toolsAndAuthOnly"
+        ],
+        "type": "string"
+      },
       "McpServerStatusUpdatedNotification": {
         "$schema": "http://json-schema.org/draft-07/schema#",
         "properties": {

codex-rs/app-server-protocol/schema/json/codex_app_server_protocol.v2.schemas.json

@@ -5427,6 +5427,17 @@
             "null"
           ]
         },
+        "detail": {
+          "anyOf": [
+            {
+              "$ref": "#/definitions/McpServerStatusDetail"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "description": "Controls how much MCP inventory data to fetch for each server. Defaults to `Full` when omitted."
+        },
         "limit": {
           "description": "Optional page size; defaults to a server-defined value.",
           "format": "uint32",
@@ -5867,6 +5878,13 @@
       ],
       "type": "object"
     },
+    "McpServerStatusDetail": {
+      "enum": [
+        "full",
+        "toolsAndAuthOnly"
+      ],
+      "type": "string"
+    },
     "McpServerStatusUpdatedNotification": {
       "$schema": "http://json-schema.org/draft-07/schema#",
       "properties": {

codex-rs/app-server-protocol/schema/json/v2/ListMcpServerStatusParams.json

@@ -1,5 +1,14 @@
 {
   "$schema": "http://json-schema.org/draft-07/schema#",
+  "definitions": {
+    "McpServerStatusDetail": {
+      "enum": [
+        "full",
+        "toolsAndAuthOnly"
+      ],
+      "type": "string"
+    }
+  },
   "properties": {
     "cursor": {
       "description": "Opaque pagination cursor returned by a previous call.",
@@ -8,6 +17,17 @@
         "null"
       ]
     },
+    "detail": {
+      "anyOf": [
+        {
+          "$ref": "#/definitions/McpServerStatusDetail"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "Controls how much MCP inventory data to fetch for each server. Defaults to `Full` when omitted."
+    },
     "limit": {
       "description": "Optional page size; defaults to a server-defined value.",
       "format": "uint32",

codex-rs/app-server-protocol/schema/typescript/v2/ListMcpServerStatusParams.ts

@@ -1,6 +1,7 @@
 // GENERATED CODE! DO NOT MODIFY BY HAND!
 
 // This file was generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
+import type { McpServerStatusDetail } from "./McpServerStatusDetail";
 
 export type ListMcpServerStatusParams = { 
 /**
@@ -10,4 +11,9 @@ cursor?: string | null,
 /**
  * Optional page size; defaults to a server-defined value.
  */
-limit?: number | null, };
+limit?: number | null, 
+/**
+ * Controls how much MCP inventory data to fetch for each server.
+ * Defaults to `Full` when omitted.
+ */
+detail?: McpServerStatusDetail | null, };

codex-rs/app-server-protocol/schema/typescript/v2/McpServerStatusDetail.ts

@@ -0,0 +1,5 @@
+// GENERATED CODE! DO NOT MODIFY BY HAND!
+
+// This file was generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
+
+export type McpServerStatusDetail = "full" | "toolsAndAuthOnly";

codex-rs/app-server-protocol/schema/typescript/v2/index.ts

@@ -181,6 +181,7 @@ export type { McpServerOauthLoginResponse } from "./McpServerOauthLoginResponse"
 export type { McpServerRefreshResponse } from "./McpServerRefreshResponse";
 export type { McpServerStartupState } from "./McpServerStartupState";
 export type { McpServerStatus } from "./McpServerStatus";
+export type { McpServerStatusDetail } from "./McpServerStatusDetail";
 export type { McpServerStatusUpdatedNotification } from "./McpServerStatusUpdatedNotification";
 export type { McpToolCallError } from "./McpToolCallError";
 export type { McpToolCallProgressNotification } from "./McpToolCallProgressNotification";

codex-rs/app-server-protocol/src/protocol/v2.rs

@@ -1949,6 +1949,18 @@ pub struct ListMcpServerStatusParams {
     /// Optional page size; defaults to a server-defined value.
     #[ts(optional = nullable)]
     pub limit: Option<u32>,
+    /// Controls how much MCP inventory data to fetch for each server.
+    /// Defaults to `Full` when omitted.
+    #[ts(optional = nullable)]
+    pub detail: Option<McpServerStatusDetail>,
+}
+
+#[derive(Serialize, Deserialize, Debug, Clone, Copy, PartialEq, Eq, JsonSchema, TS)]
+#[serde(rename_all = "camelCase")]
+#[ts(rename_all = "camelCase", export_to = "v2/")]
+pub enum McpServerStatusDetail {
+    Full,
+    ToolsAndAuthOnly,
 }
 
 #[derive(Serialize, Deserialize, Debug, Clone, PartialEq, JsonSchema, TS)]