openai · owenlin0 · Mar 19, 2026 · Mar 19, 2026 · Mar 19, 2026 · Mar 19, 2026
diff --git a/codex-rs/app-server-protocol/schema/json/ServerNotification.json b/codex-rs/app-server-protocol/schema/json/ServerNotification.json
@@ -1435,6 +1435,36 @@
       ],
       "type": "object"
     },
+    "McpServerStartupState": {
+      "enum": [
+        "starting",
+        "ready",
+        "failed",
+        "cancelled"
+      ],
+      "type": "string"
+    },
+    "McpServerStatusUpdatedNotification": {
+      "properties": {
+        "error": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "name": {
+          "type": "string"
+        },
+        "status": {
+          "$ref": "#/definitions/McpServerStartupState"
+        }
+      },
+      "required": [
+        "name",
+        "status"
+      ],
+      "type": "object"
+    },
     "McpToolCallError": {
       "properties": {
         "message": {
@@ -4214,6 +4244,26 @@
       "title": "McpServer/oauthLogin/completedNotification",
       "type": "object"
     },
+    {
+      "properties": {
+        "method": {
+          "enum": [
+            "mcpServer/startupStatus/updated"
+          ],
+          "title": "McpServer/startupStatus/updatedNotificationMethod",
+          "type": "string"
+        },
+        "params": {
+          "$ref": "#/definitions/McpServerStatusUpdatedNotification"
+        }
+      },
+      "required": [
+        "method",
+        "params"
+      ],
+      "title": "McpServer/startupStatus/updatedNotification",
+      "type": "object"
+    },
     {
       "properties": {
         "method": {

diff --git a/codex-rs/app-server-protocol/schema/json/codex_app_server_protocol.schemas.json b/codex-rs/app-server-protocol/schema/json/codex_app_server_protocol.schemas.json
@@ -3973,6 +3973,26 @@
           "title": "McpServer/oauthLogin/completedNotification",
           "type": "object"
         },
+        {
+          "properties": {
+            "method": {
+              "enum": [
+                "mcpServer/startupStatus/updated"
+              ],
+              "title": "McpServer/startupStatus/updatedNotificationMethod",
+              "type": "string"
+            },
+            "params": {
+              "$ref": "#/definitions/v2/McpServerStatusUpdatedNotification"
+            }
+          },
+          "required": [
+            "method",
+            "params"
+          ],
+          "title": "McpServer/startupStatus/updatedNotification",
+          "type": "object"
+        },
         {
           "properties": {
             "method": {
@@ -8566,6 +8586,15 @@
         "title": "McpServerRefreshResponse",
         "type": "object"
       },
+      "McpServerStartupState": {
+        "enum": [
+          "starting",
+          "ready",
+          "failed",
+          "cancelled"
+        ],
+        "type": "string"
+      },
       "McpServerStatus": {
         "properties": {
           "authStatus": {
@@ -8602,6 +8631,29 @@
         ],
         "type": "object"
       },
+      "McpServerStatusUpdatedNotification": {
+        "$schema": "http://json-schema.org/draft-07/schema#",
+        "properties": {
+          "error": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "name": {
+            "type": "string"
+          },
+          "status": {
+            "$ref": "#/definitions/v2/McpServerStartupState"
+          }
+        },
+        "required": [
+          "name",
+          "status"
+        ],
+        "title": "McpServerStatusUpdatedNotification",
+        "type": "object"
+      },
       "McpToolCallError": {
         "properties": {
           "message": {

diff --git a/codex-rs/app-server-protocol/schema/json/codex_app_server_protocol.v2.schemas.json b/codex-rs/app-server-protocol/schema/json/codex_app_server_protocol.v2.schemas.json
@@ -5354,6 +5354,15 @@
       "title": "McpServerRefreshResponse",
       "type": "object"
     },
+    "McpServerStartupState": {
+      "enum": [
+        "starting",
+        "ready",
+        "failed",
+        "cancelled"
+      ],
+      "type": "string"
+    },
     "McpServerStatus": {
       "properties": {
         "authStatus": {
@@ -5390,6 +5399,29 @@
       ],
       "type": "object"
     },
+    "McpServerStatusUpdatedNotification": {
+      "$schema": "http://json-schema.org/draft-07/schema#",
+      "properties": {
+        "error": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "name": {
+          "type": "string"
+        },
+        "status": {
+          "$ref": "#/definitions/McpServerStartupState"
+        }
+      },
+      "required": [
+        "name",
+        "status"
+      ],
+      "title": "McpServerStatusUpdatedNotification",
+      "type": "object"
+    },
     "McpToolCallError": {
       "properties": {
         "message": {
@@ -8369,6 +8401,26 @@
           "title": "McpServer/oauthLogin/completedNotification",
           "type": "object"
         },
+        {
+          "properties": {
+            "method": {
+              "enum": [
+                "mcpServer/startupStatus/updated"
+              ],
+              "title": "McpServer/startupStatus/updatedNotificationMethod",
+              "type": "string"
+            },
+            "params": {
+              "$ref": "#/definitions/McpServerStatusUpdatedNotification"
+            }
+          },
+          "required": [
+            "method",
+            "params"
+          ],
+          "title": "McpServer/startupStatus/updatedNotification",
+          "type": "object"
+        },
         {
           "properties": {
             "method": {

diff --git a/codex-rs/app-server-protocol/schema/json/v2/McpServerStatusUpdatedNotification.json b/codex-rs/app-server-protocol/schema/json/v2/McpServerStatusUpdatedNotification.json
@@ -0,0 +1,34 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "definitions": {
+    "McpServerStartupState": {
+      "enum": [
+        "starting",
+        "ready",
+        "failed",
+        "cancelled"
+      ],
+      "type": "string"
+    }
+  },
+  "properties": {
+    "error": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "name": {
+      "type": "string"
+    },
+    "status": {
+      "$ref": "#/definitions/McpServerStartupState"
+    }
+  },
+  "required": [
+    "name",
+    "status"
+  ],
+  "title": "McpServerStatusUpdatedNotification",
+  "type": "object"
+}
diff --git a/codex-rs/app-server-protocol/schema/typescript/ServerNotification.ts b/codex-rs/app-server-protocol/schema/typescript/ServerNotification.ts
@@ -22,6 +22,7 @@ import type { ItemGuardianApprovalReviewCompletedNotification } from "./v2/ItemG
 import type { ItemGuardianApprovalReviewStartedNotification } from "./v2/ItemGuardianApprovalReviewStartedNotification";
 import type { ItemStartedNotification } from "./v2/ItemStartedNotification";
 import type { McpServerOauthLoginCompletedNotification } from "./v2/McpServerOauthLoginCompletedNotification";
+import type { McpServerStatusUpdatedNotification } from "./v2/McpServerStatusUpdatedNotification";
 import type { McpToolCallProgressNotification } from "./v2/McpToolCallProgressNotification";
 import type { ModelReroutedNotification } from "./v2/ModelReroutedNotification";
 import type { PlanDeltaNotification } from "./v2/PlanDeltaNotification";
@@ -54,4 +55,4 @@ import type { WindowsWorldWritableWarningNotification } from "./v2/WindowsWorldW
 /**
  * Notification sent from the server to the client.
  */
-export type ServerNotification = { "method": "error", "params": ErrorNotification } | { "method": "thread/started", "params": ThreadStartedNotification } | { "method": "thread/status/changed", "params": ThreadStatusChangedNotification } | { "method": "thread/archived", "params": ThreadArchivedNotification } | { "method": "thread/unarchived", "params": ThreadUnarchivedNotification } | { "method": "thread/closed", "params": ThreadClosedNotification } | { "method": "skills/changed", "params": SkillsChangedNotification } | { "method": "thread/name/updated", "params": ThreadNameUpdatedNotification } | { "method": "thread/tokenUsage/updated", "params": ThreadTokenUsageUpdatedNotification } | { "method": "turn/started", "params": TurnStartedNotification } | { "method": "hook/started", "params": HookStartedNotification } | { "method": "turn/completed", "params": TurnCompletedNotification } | { "method": "hook/completed", "params": HookCompletedNotification } | { "method": "turn/diff/updated", "params": TurnDiffUpdatedNotification } | { "method": "turn/plan/updated", "params": TurnPlanUpdatedNotification } | { "method": "item/started", "params": ItemStartedNotification } | { "method": "item/autoApprovalReview/started", "params": ItemGuardianApprovalReviewStartedNotification } | { "method": "item/autoApprovalReview/completed", "params": ItemGuardianApprovalReviewCompletedNotification } | { "method": "item/completed", "params": ItemCompletedNotification } | { "method": "rawResponseItem/completed", "params": RawResponseItemCompletedNotification } | { "method": "item/agentMessage/delta", "params": AgentMessageDeltaNotification } | { "method": "item/plan/delta", "params": PlanDeltaNotification } | { "method": "command/exec/outputDelta", "params": CommandExecOutputDeltaNotification } | { "method": "item/commandExecution/outputDelta", "params": CommandExecutionOutputDeltaNotification } | { "method": "item/commandExecution/terminalInteraction", "params": TerminalInteractionNotification } | { "method": "item/fileChange/outputDelta", "params": FileChangeOutputDeltaNotification } | { "method": "serverRequest/resolved", "params": ServerRequestResolvedNotification } | { "method": "item/mcpToolCall/progress", "params": McpToolCallProgressNotification } | { "method": "mcpServer/oauthLogin/completed", "params": McpServerOauthLoginCompletedNotification } | { "method": "account/updated", "params": AccountUpdatedNotification } | { "method": "account/rateLimits/updated", "params": AccountRateLimitsUpdatedNotification } | { "method": "app/list/updated", "params": AppListUpdatedNotification } | { "method": "item/reasoning/summaryTextDelta", "params": ReasoningSummaryTextDeltaNotification } | { "method": "item/reasoning/summaryPartAdded", "params": ReasoningSummaryPartAddedNotification } | { "method": "item/reasoning/textDelta", "params": ReasoningTextDeltaNotification } | { "method": "thread/compacted", "params": ContextCompactedNotification } | { "method": "model/rerouted", "params": ModelReroutedNotification } | { "method": "deprecationNotice", "params": DeprecationNoticeNotification } | { "method": "configWarning", "params": ConfigWarningNotification } | { "method": "fuzzyFileSearch/sessionUpdated", "params": FuzzyFileSearchSessionUpdatedNotification } | { "method": "fuzzyFileSearch/sessionCompleted", "params": FuzzyFileSearchSessionCompletedNotification } | { "method": "thread/realtime/started", "params": ThreadRealtimeStartedNotification } | { "method": "thread/realtime/itemAdded", "params": ThreadRealtimeItemAddedNotification } | { "method": "thread/realtime/outputAudio/delta", "params": ThreadRealtimeOutputAudioDeltaNotification } | { "method": "thread/realtime/error", "params": ThreadRealtimeErrorNotification } | { "method": "thread/realtime/closed", "params": ThreadRealtimeClosedNotification } | { "method": "windows/worldWritableWarning", "params": WindowsWorldWritableWarningNotification } | { "method": "windowsSandbox/setupCompleted", "params": WindowsSandboxSetupCompletedNotification } | { "method": "account/login/completed", "params": AccountLoginCompletedNotification };
+export type ServerNotification = { "method": "error", "params": ErrorNotification } | { "method": "thread/started", "params": ThreadStartedNotification } | { "method": "thread/status/changed", "params": ThreadStatusChangedNotification } | { "method": "thread/archived", "params": ThreadArchivedNotification } | { "method": "thread/unarchived", "params": ThreadUnarchivedNotification } | { "method": "thread/closed", "params": ThreadClosedNotification } | { "method": "skills/changed", "params": SkillsChangedNotification } | { "method": "thread/name/updated", "params": ThreadNameUpdatedNotification } | { "method": "thread/tokenUsage/updated", "params": ThreadTokenUsageUpdatedNotification } | { "method": "turn/started", "params": TurnStartedNotification } | { "method": "hook/started", "params": HookStartedNotification } | { "method": "turn/completed", "params": TurnCompletedNotification } | { "method": "hook/completed", "params": HookCompletedNotification } | { "method": "turn/diff/updated", "params": TurnDiffUpdatedNotification } | { "method": "turn/plan/updated", "params": TurnPlanUpdatedNotification } | { "method": "item/started", "params": ItemStartedNotification } | { "method": "item/autoApprovalReview/started", "params": ItemGuardianApprovalReviewStartedNotification } | { "method": "item/autoApprovalReview/completed", "params": ItemGuardianApprovalReviewCompletedNotification } | { "method": "item/completed", "params": ItemCompletedNotification } | { "method": "rawResponseItem/completed", "params": RawResponseItemCompletedNotification } | { "method": "item/agentMessage/delta", "params": AgentMessageDeltaNotification } | { "method": "item/plan/delta", "params": PlanDeltaNotification } | { "method": "command/exec/outputDelta", "params": CommandExecOutputDeltaNotification } | { "method": "item/commandExecution/outputDelta", "params": CommandExecutionOutputDeltaNotification } | { "method": "item/commandExecution/terminalInteraction", "params": TerminalInteractionNotification } | { "method": "item/fileChange/outputDelta", "params": FileChangeOutputDeltaNotification } | { "method": "serverRequest/resolved", "params": ServerRequestResolvedNotification } | { "method": "item/mcpToolCall/progress", "params": McpToolCallProgressNotification } | { "method": "mcpServer/oauthLogin/completed", "params": McpServerOauthLoginCompletedNotification } | { "method": "mcpServer/startupStatus/updated", "params": McpServerStatusUpdatedNotification } | { "method": "account/updated", "params": AccountUpdatedNotification } | { "method": "account/rateLimits/updated", "params": AccountRateLimitsUpdatedNotification } | { "method": "app/list/updated", "params": AppListUpdatedNotification } | { "method": "item/reasoning/summaryTextDelta", "params": ReasoningSummaryTextDeltaNotification } | { "method": "item/reasoning/summaryPartAdded", "params": ReasoningSummaryPartAddedNotification } | { "method": "item/reasoning/textDelta", "params": ReasoningTextDeltaNotification } | { "method": "thread/compacted", "params": ContextCompactedNotification } | { "method": "model/rerouted", "params": ModelReroutedNotification } | { "method": "deprecationNotice", "params": DeprecationNoticeNotification } | { "method": "configWarning", "params": ConfigWarningNotification } | { "method": "fuzzyFileSearch/sessionUpdated", "params": FuzzyFileSearchSessionUpdatedNotification } | { "method": "fuzzyFileSearch/sessionCompleted", "params": FuzzyFileSearchSessionCompletedNotification } | { "method": "thread/realtime/started", "params": ThreadRealtimeStartedNotification } | { "method": "thread/realtime/itemAdded", "params": ThreadRealtimeItemAddedNotification } | { "method": "thread/realtime/outputAudio/delta", "params": ThreadRealtimeOutputAudioDeltaNotification } | { "method": "thread/realtime/error", "params": ThreadRealtimeErrorNotification } | { "method": "thread/realtime/closed", "params": ThreadRealtimeClosedNotification } | { "method": "windows/worldWritableWarning", "params": WindowsWorldWritableWarningNotification } | { "method": "windowsSandbox/setupCompleted", "params": WindowsSandboxSetupCompletedNotification } | { "method": "account/login/completed", "params": AccountLoginCompletedNotification };
diff --git a/codex-rs/app-server-protocol/schema/typescript/v2/McpServerStartupState.ts b/codex-rs/app-server-protocol/schema/typescript/v2/McpServerStartupState.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 McpServerStartupState = "starting" | "ready" | "failed" | "cancelled";
diff --git a/codex-rs/app-server-protocol/schema/typescript/v2/McpServerStatusUpdatedNotification.ts b/codex-rs/app-server-protocol/schema/typescript/v2/McpServerStatusUpdatedNotification.ts
@@ -0,0 +1,6 @@
+// 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 { McpServerStartupState } from "./McpServerStartupState";
+
+export type McpServerStatusUpdatedNotification = { name: string, status: McpServerStartupState, error: string | null, };
diff --git a/codex-rs/app-server-protocol/schema/typescript/v2/index.ts b/codex-rs/app-server-protocol/schema/typescript/v2/index.ts
@@ -171,7 +171,9 @@ export type { McpServerOauthLoginCompletedNotification } from "./McpServerOauthL
 export type { McpServerOauthLoginParams } from "./McpServerOauthLoginParams";
 export type { McpServerOauthLoginResponse } from "./McpServerOauthLoginResponse";
 export type { McpServerRefreshResponse } from "./McpServerRefreshResponse";
+export type { McpServerStartupState } from "./McpServerStartupState";
 export type { McpServerStatus } from "./McpServerStatus";
+export type { McpServerStatusUpdatedNotification } from "./McpServerStatusUpdatedNotification";
 export type { McpToolCallError } from "./McpToolCallError";
 export type { McpToolCallProgressNotification } from "./McpToolCallProgressNotification";
 export type { McpToolCallResult } from "./McpToolCallResult";

diff --git a/codex-rs/app-server-protocol/src/protocol/common.rs b/codex-rs/app-server-protocol/src/protocol/common.rs
@@ -905,6 +905,7 @@ server_notification_definitions! {
     ServerRequestResolved => "serverRequest/resolved" (v2::ServerRequestResolvedNotification),
     McpToolCallProgress => "item/mcpToolCall/progress" (v2::McpToolCallProgressNotification),
     McpServerOauthLoginCompleted => "mcpServer/oauthLogin/completed" (v2::McpServerOauthLoginCompletedNotification),
+    McpServerStatusUpdated => "mcpServer/startupStatus/updated" (v2::McpServerStatusUpdatedNotification),
     AccountUpdated => "account/updated" (v2::AccountUpdatedNotification),
     AccountRateLimitsUpdated => "account/rateLimits/updated" (v2::AccountRateLimitsUpdatedNotification),
     AppListUpdated => "app/list/updated" (v2::AppListUpdatedNotification),

diff --git a/codex-rs/app-server-protocol/src/protocol/v2.rs b/codex-rs/app-server-protocol/src/protocol/v2.rs
@@ -5000,6 +5000,25 @@ pub struct McpServerOauthLoginCompletedNotification {
     pub error: Option<String>,
 }
 
+#[derive(Serialize, Deserialize, Debug, Clone, Copy, PartialEq, Eq, JsonSchema, TS)]
+#[serde(rename_all = "camelCase")]
+#[ts(export_to = "v2/")]
+pub enum McpServerStartupState {
+    Starting,
+    Ready,
+    Failed,
+    Cancelled,
+}
+
+#[derive(Serialize, Deserialize, Debug, Clone, PartialEq, JsonSchema, TS)]
+#[serde(rename_all = "camelCase")]
+#[ts(export_to = "v2/")]
+pub struct McpServerStatusUpdatedNotification {
+    pub name: String,
+    pub status: McpServerStartupState,
+    pub error: Option<String>,
+}
+
 #[derive(Serialize, Deserialize, Debug, Clone, PartialEq, JsonSchema, TS)]
 #[serde(rename_all = "camelCase")]
 #[ts(export_to = "v2/")]

diff --git a/codex-rs/app-server/README.md b/codex-rs/app-server/README.md
@@ -836,6 +836,10 @@ Because audio is intentionally separate from `ThreadItem`, clients can opt out o
 
 - `windowsSandbox/setupCompleted` — `{ mode, success, error }` after a `windowsSandbox/setupStart` request finishes.
 
+### MCP server startup events
+
+- `mcpServer/startupStatus/updated` — `{ name, status, error }` when app-server observes an MCP server startup transition. `status` is one of `starting`, `ready`, `failed`, or `cancelled`. `error` is `null` except for `failed`.
+
 ### Turn events
 
 The app-server streams JSON-RPC notifications while a turn is running. Each turn emits `turn/started` when it begins running and ends with `turn/completed` (final `turn` status). Token usage events stream separately via `thread/tokenUsage/updated`. Clients subscribe to the events they care about, rendering each item incrementally as updates arrive. The per-item lifecycle is always: `item/started` → zero or more item-specific deltas → `item/completed`.
@@ -1258,6 +1262,7 @@ Codex supports these authentication modes. The current mode is surfaced in `acco
 - `account/rateLimits/read` — fetch ChatGPT rate limits; updates arrive via `account/rateLimits/updated` (notify).
 - `account/rateLimits/updated` (notify) — emitted whenever a user's ChatGPT rate limits change.
 - `mcpServer/oauthLogin/completed` (notify) — emitted after a `mcpServer/oauth/login` flow finishes for a server; payload includes `{ name, success, error? }`.
+- `mcpServer/startupStatus/updated` (notify) — emitted when a configured MCP server's startup status changes for a loaded thread; payload includes `{ name, status, error }` where `status` is `starting`, `ready`, `failed`, or `cancelled`.
 
 ### 1) Check auth state