diff --git a/codex-rs/app-server-protocol/schema/json/ServerNotification.json b/codex-rs/app-server-protocol/schema/json/ServerNotification.json
index 251327a560..2980a68f8a 100644
--- a/codex-rs/app-server-protocol/schema/json/ServerNotification.json
+++ b/codex-rs/app-server-protocol/schema/json/ServerNotification.json
@@ -3532,6 +3532,30 @@
     },
     "Turn": {
       "properties": {
+        "completedAt": {
+          "description": "Unix timestamp (in seconds) when the turn completed.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
+        "createdAt": {
+          "description": "Unix timestamp (in seconds) when the turn started.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
+        "durationMs": {
+          "description": "Duration between turn start and completion in milliseconds, if known.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
         "error": {
           "anyOf": [
             {
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
index 0771cb0e82..567bd5850f 100644
--- 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
@@ -14336,6 +14336,30 @@
       },
       "Turn": {
         "properties": {
+          "completedAt": {
+            "description": "Unix timestamp (in seconds) when the turn completed.",
+            "format": "int64",
+            "type": [
+              "integer",
+              "null"
+            ]
+          },
+          "createdAt": {
+            "description": "Unix timestamp (in seconds) when the turn started.",
+            "format": "int64",
+            "type": [
+              "integer",
+              "null"
+            ]
+          },
+          "durationMs": {
+            "description": "Duration between turn start and completion in milliseconds, if known.",
+            "format": "int64",
+            "type": [
+              "integer",
+              "null"
+            ]
+          },
           "error": {
             "anyOf": [
               {
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
index 8af7e0d716..4e2ce1ffa0 100644
--- 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
@@ -12191,6 +12191,30 @@
     },
     "Turn": {
       "properties": {
+        "completedAt": {
+          "description": "Unix timestamp (in seconds) when the turn completed.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
+        "createdAt": {
+          "description": "Unix timestamp (in seconds) when the turn started.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
+        "durationMs": {
+          "description": "Duration between turn start and completion in milliseconds, if known.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
         "error": {
           "anyOf": [
             {
diff --git a/codex-rs/app-server-protocol/schema/json/v2/ReviewStartResponse.json b/codex-rs/app-server-protocol/schema/json/v2/ReviewStartResponse.json
index 2e0c3605e7..8c740ee7af 100644
--- a/codex-rs/app-server-protocol/schema/json/v2/ReviewStartResponse.json
+++ b/codex-rs/app-server-protocol/schema/json/v2/ReviewStartResponse.json
@@ -1267,6 +1267,30 @@
     },
     "Turn": {
       "properties": {
+        "completedAt": {
+          "description": "Unix timestamp (in seconds) when the turn completed.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
+        "createdAt": {
+          "description": "Unix timestamp (in seconds) when the turn started.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
+        "durationMs": {
+          "description": "Duration between turn start and completion in milliseconds, if known.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
         "error": {
           "anyOf": [
             {
diff --git a/codex-rs/app-server-protocol/schema/json/v2/ThreadForkResponse.json b/codex-rs/app-server-protocol/schema/json/v2/ThreadForkResponse.json
index 88448a1658..b6ec6e1b4f 100644
--- a/codex-rs/app-server-protocol/schema/json/v2/ThreadForkResponse.json
+++ b/codex-rs/app-server-protocol/schema/json/v2/ThreadForkResponse.json
@@ -1856,6 +1856,30 @@
     },
     "Turn": {
       "properties": {
+        "completedAt": {
+          "description": "Unix timestamp (in seconds) when the turn completed.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
+        "createdAt": {
+          "description": "Unix timestamp (in seconds) when the turn started.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
+        "durationMs": {
+          "description": "Duration between turn start and completion in milliseconds, if known.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
         "error": {
           "anyOf": [
             {
diff --git a/codex-rs/app-server-protocol/schema/json/v2/ThreadListResponse.json b/codex-rs/app-server-protocol/schema/json/v2/ThreadListResponse.json
index f26bd03a34..2f24d72bef 100644
--- a/codex-rs/app-server-protocol/schema/json/v2/ThreadListResponse.json
+++ b/codex-rs/app-server-protocol/schema/json/v2/ThreadListResponse.json
@@ -1614,6 +1614,30 @@
     },
     "Turn": {
       "properties": {
+        "completedAt": {
+          "description": "Unix timestamp (in seconds) when the turn completed.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
+        "createdAt": {
+          "description": "Unix timestamp (in seconds) when the turn started.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
+        "durationMs": {
+          "description": "Duration between turn start and completion in milliseconds, if known.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
         "error": {
           "anyOf": [
             {
diff --git a/codex-rs/app-server-protocol/schema/json/v2/ThreadMetadataUpdateResponse.json b/codex-rs/app-server-protocol/schema/json/v2/ThreadMetadataUpdateResponse.json
index 88c8e688df..5d7adc441a 100644
--- a/codex-rs/app-server-protocol/schema/json/v2/ThreadMetadataUpdateResponse.json
+++ b/codex-rs/app-server-protocol/schema/json/v2/ThreadMetadataUpdateResponse.json
@@ -1614,6 +1614,30 @@
     },
     "Turn": {
       "properties": {
+        "completedAt": {
+          "description": "Unix timestamp (in seconds) when the turn completed.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
+        "createdAt": {
+          "description": "Unix timestamp (in seconds) when the turn started.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
+        "durationMs": {
+          "description": "Duration between turn start and completion in milliseconds, if known.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
         "error": {
           "anyOf": [
             {
diff --git a/codex-rs/app-server-protocol/schema/json/v2/ThreadReadResponse.json b/codex-rs/app-server-protocol/schema/json/v2/ThreadReadResponse.json
index 8453207380..2d77b0f203 100644
--- a/codex-rs/app-server-protocol/schema/json/v2/ThreadReadResponse.json
+++ b/codex-rs/app-server-protocol/schema/json/v2/ThreadReadResponse.json
@@ -1614,6 +1614,30 @@
     },
     "Turn": {
       "properties": {
+        "completedAt": {
+          "description": "Unix timestamp (in seconds) when the turn completed.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
+        "createdAt": {
+          "description": "Unix timestamp (in seconds) when the turn started.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
+        "durationMs": {
+          "description": "Duration between turn start and completion in milliseconds, if known.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
         "error": {
           "anyOf": [
             {
diff --git a/codex-rs/app-server-protocol/schema/json/v2/ThreadResumeResponse.json b/codex-rs/app-server-protocol/schema/json/v2/ThreadResumeResponse.json
index e21f253b72..c5dd0e10a5 100644
--- a/codex-rs/app-server-protocol/schema/json/v2/ThreadResumeResponse.json
+++ b/codex-rs/app-server-protocol/schema/json/v2/ThreadResumeResponse.json
@@ -1856,6 +1856,30 @@
     },
     "Turn": {
       "properties": {
+        "completedAt": {
+          "description": "Unix timestamp (in seconds) when the turn completed.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
+        "createdAt": {
+          "description": "Unix timestamp (in seconds) when the turn started.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
+        "durationMs": {
+          "description": "Duration between turn start and completion in milliseconds, if known.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
         "error": {
           "anyOf": [
             {
diff --git a/codex-rs/app-server-protocol/schema/json/v2/ThreadRollbackResponse.json b/codex-rs/app-server-protocol/schema/json/v2/ThreadRollbackResponse.json
index d719ba7d8f..3f6fba4be2 100644
--- a/codex-rs/app-server-protocol/schema/json/v2/ThreadRollbackResponse.json
+++ b/codex-rs/app-server-protocol/schema/json/v2/ThreadRollbackResponse.json
@@ -1614,6 +1614,30 @@
     },
     "Turn": {
       "properties": {
+        "completedAt": {
+          "description": "Unix timestamp (in seconds) when the turn completed.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
+        "createdAt": {
+          "description": "Unix timestamp (in seconds) when the turn started.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
+        "durationMs": {
+          "description": "Duration between turn start and completion in milliseconds, if known.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
         "error": {
           "anyOf": [
             {
diff --git a/codex-rs/app-server-protocol/schema/json/v2/ThreadStartResponse.json b/codex-rs/app-server-protocol/schema/json/v2/ThreadStartResponse.json
index 27a8cdd6bf..62a9f33589 100644
--- a/codex-rs/app-server-protocol/schema/json/v2/ThreadStartResponse.json
+++ b/codex-rs/app-server-protocol/schema/json/v2/ThreadStartResponse.json
@@ -1856,6 +1856,30 @@
     },
     "Turn": {
       "properties": {
+        "completedAt": {
+          "description": "Unix timestamp (in seconds) when the turn completed.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
+        "createdAt": {
+          "description": "Unix timestamp (in seconds) when the turn started.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
+        "durationMs": {
+          "description": "Duration between turn start and completion in milliseconds, if known.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
         "error": {
           "anyOf": [
             {
diff --git a/codex-rs/app-server-protocol/schema/json/v2/ThreadStartedNotification.json b/codex-rs/app-server-protocol/schema/json/v2/ThreadStartedNotification.json
index c202363e3b..ed2e25f7c7 100644
--- a/codex-rs/app-server-protocol/schema/json/v2/ThreadStartedNotification.json
+++ b/codex-rs/app-server-protocol/schema/json/v2/ThreadStartedNotification.json
@@ -1614,6 +1614,30 @@
     },
     "Turn": {
       "properties": {
+        "completedAt": {
+          "description": "Unix timestamp (in seconds) when the turn completed.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
+        "createdAt": {
+          "description": "Unix timestamp (in seconds) when the turn started.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
+        "durationMs": {
+          "description": "Duration between turn start and completion in milliseconds, if known.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
         "error": {
           "anyOf": [
             {
diff --git a/codex-rs/app-server-protocol/schema/json/v2/ThreadUnarchiveResponse.json b/codex-rs/app-server-protocol/schema/json/v2/ThreadUnarchiveResponse.json
index 542aea1765..79836839c9 100644
--- a/codex-rs/app-server-protocol/schema/json/v2/ThreadUnarchiveResponse.json
+++ b/codex-rs/app-server-protocol/schema/json/v2/ThreadUnarchiveResponse.json
@@ -1614,6 +1614,30 @@
     },
     "Turn": {
       "properties": {
+        "completedAt": {
+          "description": "Unix timestamp (in seconds) when the turn completed.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
+        "createdAt": {
+          "description": "Unix timestamp (in seconds) when the turn started.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
+        "durationMs": {
+          "description": "Duration between turn start and completion in milliseconds, if known.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
         "error": {
           "anyOf": [
             {
diff --git a/codex-rs/app-server-protocol/schema/json/v2/TurnCompletedNotification.json b/codex-rs/app-server-protocol/schema/json/v2/TurnCompletedNotification.json
index 3780541077..4d6a2821c7 100644
--- a/codex-rs/app-server-protocol/schema/json/v2/TurnCompletedNotification.json
+++ b/codex-rs/app-server-protocol/schema/json/v2/TurnCompletedNotification.json
@@ -1267,6 +1267,30 @@
     },
     "Turn": {
       "properties": {
+        "completedAt": {
+          "description": "Unix timestamp (in seconds) when the turn completed.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
+        "createdAt": {
+          "description": "Unix timestamp (in seconds) when the turn started.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
+        "durationMs": {
+          "description": "Duration between turn start and completion in milliseconds, if known.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
         "error": {
           "anyOf": [
             {
diff --git a/codex-rs/app-server-protocol/schema/json/v2/TurnStartResponse.json b/codex-rs/app-server-protocol/schema/json/v2/TurnStartResponse.json
index 7f1c3e4948..1e79af9fb1 100644
--- a/codex-rs/app-server-protocol/schema/json/v2/TurnStartResponse.json
+++ b/codex-rs/app-server-protocol/schema/json/v2/TurnStartResponse.json
@@ -1267,6 +1267,30 @@
     },
     "Turn": {
       "properties": {
+        "completedAt": {
+          "description": "Unix timestamp (in seconds) when the turn completed.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
+        "createdAt": {
+          "description": "Unix timestamp (in seconds) when the turn started.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
+        "durationMs": {
+          "description": "Duration between turn start and completion in milliseconds, if known.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
         "error": {
           "anyOf": [
             {
diff --git a/codex-rs/app-server-protocol/schema/json/v2/TurnStartedNotification.json b/codex-rs/app-server-protocol/schema/json/v2/TurnStartedNotification.json
index 94af685a0b..37afb7243b 100644
--- a/codex-rs/app-server-protocol/schema/json/v2/TurnStartedNotification.json
+++ b/codex-rs/app-server-protocol/schema/json/v2/TurnStartedNotification.json
@@ -1267,6 +1267,30 @@
     },
     "Turn": {
       "properties": {
+        "completedAt": {
+          "description": "Unix timestamp (in seconds) when the turn completed.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
+        "createdAt": {
+          "description": "Unix timestamp (in seconds) when the turn started.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
+        "durationMs": {
+          "description": "Duration between turn start and completion in milliseconds, if known.",
+          "format": "int64",
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
         "error": {
           "anyOf": [
             {
diff --git a/codex-rs/app-server-protocol/schema/typescript/v2/Turn.ts b/codex-rs/app-server-protocol/schema/typescript/v2/Turn.ts
index 709ed5ccbe..1c8dd0657c 100644
--- a/codex-rs/app-server-protocol/schema/typescript/v2/Turn.ts
+++ b/codex-rs/app-server-protocol/schema/typescript/v2/Turn.ts
@@ -15,4 +15,16 @@ items: Array<ThreadItem>, status: TurnStatus,
 /**
  * Only populated when the Turn's status is failed.
  */
-error: TurnError | null, };
+error: TurnError | null, 
+/**
+ * Unix timestamp (in seconds) when the turn started.
+ */
+createdAt?: number | null, 
+/**
+ * Unix timestamp (in seconds) when the turn completed.
+ */
+completedAt?: number | null, 
+/**
+ * Duration between turn start and completion in milliseconds, if known.
+ */
+durationMs?: number | null, };