Add message phase to agent message thread item (#12072)

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

@@ -4415,6 +4415,13 @@
       "type": "string"
     },
     "MessagePhase": {
+      "enum": [
+        "commentary",
+        "finalAnswer"
+      ],
+      "type": "string"
+    },
+    "MessagePhase2": {
       "description": "Classifies an assistant message as interim commentary or final answer text.\n\nProviders do not emit this consistently, so callers must treat `None` as \"phase unknown\" and keep compatibility behavior for legacy models.",
       "oneOf": [
         {
@@ -5344,7 +5351,7 @@
             "phase": {
               "anyOf": [
                 {
-                  "$ref": "#/definitions/MessagePhase"
+                  "$ref": "#/definitions/MessagePhase2"
                 },
                 {
                   "type": "null"
@@ -6594,6 +6601,17 @@
             "id": {
               "type": "string"
             },
+            "phase": {
+              "anyOf": [
+                {
+                  "$ref": "#/definitions/MessagePhase"
+                },
+                {
+                  "type": "null"
+                }
+              ],
+              "default": null
+            },
             "text": {
               "type": "string"
             },
@@ -7383,7 +7401,7 @@
             "phase": {
               "anyOf": [
                 {
-                  "$ref": "#/definitions/MessagePhase"
+                  "$ref": "#/definitions/MessagePhase2"
                 },
                 {
                   "type": "null"